Re: Rearranging ALTER TABLE to avoid multi-operations bugs - Mailing list pgsql-hackers
| From | Tom Lane |
|---|---|
| Subject | Re: Rearranging ALTER TABLE to avoid multi-operations bugs |
| Date | |
| Msg-id | 24573.1572647175@sss.pgh.pa.us Whole thread Raw |
| In response to | Re: Rearranging ALTER TABLE to avoid multi-operations bugs (Tom Lane <tgl@sss.pgh.pa.us>) |
| Responses |
Re: Rearranging ALTER TABLE to avoid multi-operations bugs
(Tom Lane <tgl@sss.pgh.pa.us>)
Re: Rearranging ALTER TABLE to avoid multi-operations bugs (Tom Lane <tgl@sss.pgh.pa.us>) |
| List | pgsql-hackers |
I wrote:
> Anyway, with the benefit of more time to let this thing percolate
> in my hindbrain, I am thinking that the fundamental error we've made
> is to do transformAlterTableStmt in advance of execution *at all*.
> The idea I now have is to scrap that, and instead apply the
> parse_utilcmd.c transformations individually to each AlterTable
> subcommand when it reaches execution in "phase 2" of AlterTable().
Attached is a patch that does things that way. This appears to fix
all of the previously reported order-of-operations bugs in ALTER
TABLE, although there's still some squirrely-ness around identity
columns.
My original thought of postponing all parse analysis into the
execution phase turned out to be not quite right. We still want
to analyze ALTER COLUMN TYPE subcommands before we start doing
anything. The reason why is that any USING expressions in those
subcommands should all be parsed against the table's starting
rowtype, since those expressions will all be evaluated against
that state during a single rewrite pass in phase 3. Fortunately
(but not coincidentally, I think) the execution-passes design is
"DROP, then ALTER COLUMN TYPE, then everything else", so that this
is okay.
I had to do some other finagling to get it to work, notably breaking
down some of the passes a bit more. This allows us to have a rule
that any new subcommands deduced during mid-execution parse analysis
steps will be executed in a strictly later pass. It might've been
possible to allow it to be "same pass", but I thought that would
be putting an undesirable amount of reliance on the semantics of
appending to a list that some other function is busy scanning.
What I did about the API issues we were arguing about before was
just to move the logic ProcessUtilitySlow had for handling
non-AlterTableStmts generated by ALTER TABLE parse analysis into
a new function that tablecmds.c calls. This doesn't really resolve
any of the questions I had about event trigger processing, but
I think it at least doesn't make anything worse. (The event
trigger, logical decoding, and sepgsql tests all pass without
any changes.) It's tempting to consider providing a similar
API for CREATE SCHEMA to use, but I didn't do so here.
The squirrely-ness around identity is that while this now works:
regression=# CREATE TABLE itest8 (f1 int);
CREATE TABLE
regression=# ALTER TABLE itest8
regression-# ADD COLUMN f2 int NOT NULL,
regression-# ALTER COLUMN f2 ADD GENERATED ALWAYS AS IDENTITY;
ALTER TABLE
it doesn't work if there's rows in the table:
regression=# CREATE TABLE itest8 (f1 int);
CREATE TABLE
regression=# insert into itest8 default values;
INSERT 0 1
regression=# ALTER TABLE itest8
ADD COLUMN f2 int NOT NULL,
ALTER COLUMN f2 ADD GENERATED ALWAYS AS IDENTITY;
ERROR: column "f2" contains null values
The same would be true if you tried to do the ALTER as two separate
operations (because the ADD ... NOT NULL, without a default, will
naturally fail on a nonempty table). So I don't feel *too* awful
about that. But it'd be better if this worked. It'll require
some refactoring of where the dependency link from an identity
column to its sequence gets set up. This patch seems large enough
as-is, and it covers all the cases we've gotten field complaints
about, so I'm content to leave the residual identity issues for later.
regards, tom lane
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 8d25d14..7dc5d9a 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -86,6 +86,7 @@
#include "storage/lock.h"
#include "storage/predicate.h"
#include "storage/smgr.h"
+#include "tcop/utility.h"
#include "utils/acl.h"
#include "utils/builtins.h"
#include "utils/fmgroids.h"
@@ -144,11 +145,13 @@ static List *on_commits = NIL;
#define AT_PASS_OLD_CONSTR 3 /* re-add existing constraints */
/* We could support a RENAME COLUMN pass here, but not currently used */
#define AT_PASS_ADD_COL 4 /* ADD COLUMN */
-#define AT_PASS_COL_ATTRS 5 /* set other column attributes */
-#define AT_PASS_ADD_INDEX 6 /* ADD indexes */
-#define AT_PASS_ADD_CONSTR 7 /* ADD constraints, defaults */
-#define AT_PASS_MISC 8 /* other stuff */
-#define AT_NUM_PASSES 9
+#define AT_PASS_ADD_CONSTR 5 /* ADD constraints (initial examination) */
+#define AT_PASS_COL_ATTRS 6 /* set column attributes, eg NOT NULL */
+#define AT_PASS_ADD_INDEXCONSTR 7 /* ADD index-based constraints */
+#define AT_PASS_ADD_INDEX 8 /* ADD indexes */
+#define AT_PASS_ADD_OTHERCONSTR 9 /* ADD other constraints, defaults */
+#define AT_PASS_MISC 10 /* other stuff */
+#define AT_NUM_PASSES 11
typedef struct AlteredTableInfo
{
@@ -161,6 +164,7 @@ typedef struct AlteredTableInfo
/* Information saved by Phases 1/2 for Phase 3: */
List *constraints; /* List of NewConstraint */
List *newvals; /* List of NewColumnValue */
+ List *afterStmts; /* List of utility command parsetrees */
bool verify_new_notnull; /* T if we should recheck NOT NULL */
int rewrite; /* Reason for forced rewrite, if any */
Oid newTableSpace; /* new tablespace; 0 means no change */
@@ -340,31 +344,45 @@ static void validateForeignKeyConstraint(char *conname,
Relation rel, Relation pkrel,
Oid pkindOid, Oid constraintOid);
static void ATController(AlterTableStmt *parsetree,
- Relation rel, List *cmds, bool recurse, LOCKMODE lockmode);
+ Relation rel, List *cmds, bool recurse, LOCKMODE lockmode,
+ AlterTableUtilityContext *context);
static void ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
- bool recurse, bool recursing, LOCKMODE lockmode);
-static void ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode);
+ bool recurse, bool recursing, LOCKMODE lockmode,
+ AlterTableUtilityContext *context);
+static void ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode,
+ AlterTableUtilityContext *context);
static void ATExecCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
- AlterTableCmd *cmd, LOCKMODE lockmode);
+ AlterTableCmd *cmd, LOCKMODE lockmode, int cur_pass,
+ AlterTableUtilityContext *context);
+static AlterTableCmd *ATParseTransformCmd(List **wqueue, AlteredTableInfo *tab,
+ Relation rel, AlterTableCmd *cmd,
+ bool recurse, LOCKMODE lockmode,
+ int cur_pass,
+ AlterTableUtilityContext *context);
static void ATRewriteTables(AlterTableStmt *parsetree,
- List **wqueue, LOCKMODE lockmode);
+ List **wqueue, LOCKMODE lockmode,
+ AlterTableUtilityContext *context);
static void ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap, LOCKMODE lockmode);
static AlteredTableInfo *ATGetQueueEntry(List **wqueue, Relation rel);
static void ATSimplePermissions(Relation rel, int allowed_targets);
static void ATWrongRelkindError(Relation rel, int allowed_targets);
static void ATSimpleRecursion(List **wqueue, Relation rel,
- AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode);
+ AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
+ AlterTableUtilityContext *context);
static void ATCheckPartitionsNotInUse(Relation rel, LOCKMODE lockmode);
static void ATTypedTableRecursion(List **wqueue, Relation rel, AlterTableCmd *cmd,
- LOCKMODE lockmode);
+ LOCKMODE lockmode,
+ AlterTableUtilityContext *context);
static List *find_typed_table_dependencies(Oid typeOid, const char *typeName,
DropBehavior behavior);
static void ATPrepAddColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
- bool is_view, AlterTableCmd *cmd, LOCKMODE lockmode);
+ bool is_view, AlterTableCmd *cmd, LOCKMODE lockmode,
+ AlterTableUtilityContext *context);
static ObjectAddress ATExecAddColumn(List **wqueue, AlteredTableInfo *tab,
- Relation rel, ColumnDef *colDef,
+ Relation rel, AlterTableCmd **cmd,
bool recurse, bool recursing,
- bool if_not_exists, LOCKMODE lockmode);
+ LOCKMODE lockmode, int cur_pass,
+ AlterTableUtilityContext *context);
static bool check_for_column_name_collision(Relation rel, const char *colname,
bool if_not_exists);
static void add_column_datatype_dependency(Oid relid, int32 attnum, Oid typid);
@@ -373,7 +391,8 @@ static void ATPrepDropNotNull(Relation rel, bool recurse, bool recursing);
static ObjectAddress ATExecDropNotNull(Relation rel, const char *colName, LOCKMODE lockmode);
static void ATPrepSetNotNull(List **wqueue, Relation rel,
AlterTableCmd *cmd, bool recurse, bool recursing,
- LOCKMODE lockmode);
+ LOCKMODE lockmode,
+ AlterTableUtilityContext *context);
static ObjectAddress ATExecSetNotNull(AlteredTableInfo *tab, Relation rel,
const char *colName, LOCKMODE lockmode);
static void ATExecCheckNotNull(AlteredTableInfo *tab, Relation rel,
@@ -397,7 +416,8 @@ static ObjectAddress ATExecSetOptions(Relation rel, const char *colName,
static ObjectAddress ATExecSetStorage(Relation rel, const char *colName,
Node *newValue, LOCKMODE lockmode);
static void ATPrepDropColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
- AlterTableCmd *cmd, LOCKMODE lockmode);
+ AlterTableCmd *cmd, LOCKMODE lockmode,
+ AlterTableUtilityContext *context);
static ObjectAddress ATExecDropColumn(List **wqueue, Relation rel, const char *colName,
DropBehavior behavior,
bool recurse, bool recursing,
@@ -454,7 +474,8 @@ static void ATExecDropConstraint(Relation rel, const char *constrName,
static void ATPrepAlterColumnType(List **wqueue,
AlteredTableInfo *tab, Relation rel,
bool recurse, bool recursing,
- AlterTableCmd *cmd, LOCKMODE lockmode);
+ AlterTableCmd *cmd, LOCKMODE lockmode,
+ AlterTableUtilityContext *context);
static bool ATColumnChangeRequiresRewrite(Node *expr, AttrNumber varattno);
static ObjectAddress ATExecAlterColumnType(AlteredTableInfo *tab, Relation rel,
AlterTableCmd *cmd, LOCKMODE lockmode);
@@ -3455,7 +3476,7 @@ AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
*
* ALTER TABLE is performed in three phases:
* 1. Examine subcommands and perform pre-transformation checking.
- * 2. Update system catalogs.
+ * 2. Validate and transform subcommands, and update system catalogs.
* 3. Scan table(s) to check new constraints, and optionally recopy
* the data into new table(s).
* Phase 3 is not performed unless one or more of the subcommands requires
@@ -3466,9 +3487,10 @@ AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
* ATPrepCmd performs phase 1. A "work queue" entry is created for
* each table to be affected (there may be multiple affected tables if the
* commands traverse a table inheritance hierarchy). Also we do preliminary
- * validation of the subcommands, including parse transformation of those
- * expressions that need to be evaluated with respect to the old table
- * schema.
+ * validation of the subcommands. Because earlier subcommands may change
+ * the catalog state seen by later commands, there are limits to what can
+ * be done in this phase. Generally, this phase acquires table locks,
+ * checks permissions and relkind, and recurses to find child tables.
*
* ATRewriteCatalogs performs phase 2 for each affected table. (Note that
* phases 2 and 3 normally do no explicit recursion, since phase 1 already
@@ -3490,18 +3512,23 @@ AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode)
* lock level we want as we recurse might well be higher than required for
* that specific subcommand. So we pass down the overall lock requirement,
* rather than reassess it at lower levels.
+ *
+ * The caller also provides a "context" which is to be passed back to
+ * utility.c when we need to execute a subcommand such as CREATE INDEX.
+ * Some of the fields therein, such as the relid, are used here as well.
*/
void
-AlterTable(Oid relid, LOCKMODE lockmode, AlterTableStmt *stmt)
+AlterTable(AlterTableStmt *stmt, LOCKMODE lockmode,
+ AlterTableUtilityContext *context)
{
Relation rel;
/* Caller is required to provide an adequate lock. */
- rel = relation_open(relid, NoLock);
+ rel = relation_open(context->relid, NoLock);
CheckTableNotInUse(rel, "ALTER TABLE");
- ATController(stmt, rel, stmt->cmds, stmt->relation->inh, lockmode);
+ ATController(stmt, rel, stmt->cmds, stmt->relation->inh, lockmode, context);
}
/*
@@ -3514,6 +3541,10 @@ AlterTable(Oid relid, LOCKMODE lockmode, AlterTableStmt *stmt)
* is unsafe to use this entry point for alterations that could break
* existing query plans. On the assumption it's not used for such, we
* don't have to reject pending AFTER triggers, either.
+ *
+ * Also, since we don't have an AlterTableUtilityContext, this cannot be
+ * used for any subcommand types that require parse transformation or
+ * could generate subcommands that have to be passed to ProcessUtility.
*/
void
AlterTableInternal(Oid relid, List *cmds, bool recurse)
@@ -3525,7 +3556,7 @@ AlterTableInternal(Oid relid, List *cmds, bool recurse)
EventTriggerAlterTableRelid(relid);
- ATController(NULL, rel, cmds, recurse, lockmode);
+ ATController(NULL, rel, cmds, recurse, lockmode, NULL);
}
/*
@@ -3670,7 +3701,6 @@ AlterTableGetLockLevel(List *cmds)
break;
case AT_AddConstraint:
- case AT_ProcessedConstraint: /* becomes AT_AddConstraint */
case AT_AddConstraintRecurse: /* becomes AT_AddConstraint */
case AT_ReAddConstraint: /* becomes AT_AddConstraint */
case AT_ReAddDomainConstraint: /* becomes AT_AddConstraint */
@@ -3823,7 +3853,8 @@ AlterTableGetLockLevel(List *cmds)
*/
static void
ATController(AlterTableStmt *parsetree,
- Relation rel, List *cmds, bool recurse, LOCKMODE lockmode)
+ Relation rel, List *cmds, bool recurse, LOCKMODE lockmode,
+ AlterTableUtilityContext *context)
{
List *wqueue = NIL;
ListCell *lcmd;
@@ -3833,17 +3864,17 @@ ATController(AlterTableStmt *parsetree,
{
AlterTableCmd *cmd = (AlterTableCmd *) lfirst(lcmd);
- ATPrepCmd(&wqueue, rel, cmd, recurse, false, lockmode);
+ ATPrepCmd(&wqueue, rel, cmd, recurse, false, lockmode, context);
}
/* Close the relation, but keep lock until commit */
relation_close(rel, NoLock);
/* Phase 2: update system catalogs */
- ATRewriteCatalogs(&wqueue, lockmode);
+ ATRewriteCatalogs(&wqueue, lockmode, context);
- /* Phase 3: scan/rewrite tables as needed */
- ATRewriteTables(parsetree, &wqueue, lockmode);
+ /* Phase 3: scan/rewrite tables as needed, and run afterStmts */
+ ATRewriteTables(parsetree, &wqueue, lockmode, context);
}
/*
@@ -3857,7 +3888,8 @@ ATController(AlterTableStmt *parsetree,
*/
static void
ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
- bool recurse, bool recursing, LOCKMODE lockmode)
+ bool recurse, bool recursing, LOCKMODE lockmode,
+ AlterTableUtilityContext *context)
{
AlteredTableInfo *tab;
int pass = AT_PASS_UNSET;
@@ -3869,13 +3901,17 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
* Copy the original subcommand for each table. This avoids conflicts
* when different child tables need to make different parse
* transformations (for example, the same column may have different column
- * numbers in different children).
+ * numbers in different children). It also ensures that we don't corrupt
+ * the original parse tree, in case it is saved in plancache.
*/
cmd = copyObject(cmd);
/*
- * Do permissions checking, recursion to child tables if needed, and any
- * additional phase-1 processing needed.
+ * Do permissions and relkind checking, recursion to child tables if
+ * needed, and any additional phase-1 processing needed. (But beware of
+ * adding any processing that looks at table details that another
+ * subcommand could change. In some cases we reject multiple subcommands
+ * that could try to change the same state in contrary ways.)
*/
switch (cmd->subtype)
{
@@ -3883,14 +3919,14 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
ATSimplePermissions(rel,
ATT_TABLE | ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
ATPrepAddColumn(wqueue, rel, recurse, recursing, false, cmd,
- lockmode);
+ lockmode, context);
/* Recursion occurs during execution phase */
pass = AT_PASS_ADD_COL;
break;
case AT_AddColumnToView: /* add column via CREATE OR REPLACE VIEW */
ATSimplePermissions(rel, ATT_VIEW);
ATPrepAddColumn(wqueue, rel, recurse, recursing, true, cmd,
- lockmode);
+ lockmode, context);
/* Recursion occurs during execution phase */
pass = AT_PASS_ADD_COL;
break;
@@ -3903,19 +3939,20 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
* rules.
*/
ATSimplePermissions(rel, ATT_TABLE | ATT_VIEW | ATT_FOREIGN_TABLE);
- ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode);
+ ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
/* No command-specific prep needed */
- pass = cmd->def ? AT_PASS_ADD_CONSTR : AT_PASS_DROP;
+ pass = cmd->def ? AT_PASS_ADD_OTHERCONSTR : AT_PASS_DROP;
break;
case AT_AddIdentity:
ATSimplePermissions(rel, ATT_TABLE | ATT_VIEW | ATT_FOREIGN_TABLE);
/* This command never recurses */
- pass = AT_PASS_ADD_CONSTR;
+ pass = AT_PASS_ADD_OTHERCONSTR;
break;
case AT_SetIdentity:
ATSimplePermissions(rel, ATT_TABLE | ATT_VIEW | ATT_FOREIGN_TABLE);
/* This command never recurses */
- pass = AT_PASS_COL_ATTRS;
+ /* This should run after AddIdentity, so do it in MISC pass */
+ pass = AT_PASS_MISC;
break;
case AT_DropIdentity:
ATSimplePermissions(rel, ATT_TABLE | ATT_VIEW | ATT_FOREIGN_TABLE);
@@ -3925,23 +3962,24 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
case AT_DropNotNull: /* ALTER COLUMN DROP NOT NULL */
ATSimplePermissions(rel, ATT_TABLE | ATT_FOREIGN_TABLE);
ATPrepDropNotNull(rel, recurse, recursing);
- ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode);
+ ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
pass = AT_PASS_DROP;
break;
case AT_SetNotNull: /* ALTER COLUMN SET NOT NULL */
ATSimplePermissions(rel, ATT_TABLE | ATT_FOREIGN_TABLE);
/* Need command-specific recursion decision */
- ATPrepSetNotNull(wqueue, rel, cmd, recurse, recursing, lockmode);
+ ATPrepSetNotNull(wqueue, rel, cmd, recurse, recursing,
+ lockmode, context);
pass = AT_PASS_COL_ATTRS;
break;
case AT_CheckNotNull: /* check column is already marked NOT NULL */
ATSimplePermissions(rel, ATT_TABLE | ATT_FOREIGN_TABLE);
- ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode);
+ ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
/* No command-specific prep needed */
pass = AT_PASS_COL_ATTRS;
break;
case AT_SetStatistics: /* ALTER COLUMN SET STATISTICS */
- ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode);
+ ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
/* Performs own permission checks */
ATPrepSetStatistics(rel, cmd->name, cmd->num, cmd->def, lockmode);
pass = AT_PASS_MISC;
@@ -3954,14 +3992,15 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
break;
case AT_SetStorage: /* ALTER COLUMN SET STORAGE */
ATSimplePermissions(rel, ATT_TABLE | ATT_MATVIEW | ATT_FOREIGN_TABLE);
- ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode);
+ ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
/* No command-specific prep needed */
pass = AT_PASS_MISC;
break;
case AT_DropColumn: /* DROP COLUMN */
ATSimplePermissions(rel,
ATT_TABLE | ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
- ATPrepDropColumn(wqueue, rel, recurse, recursing, cmd, lockmode);
+ ATPrepDropColumn(wqueue, rel, recurse, recursing, cmd,
+ lockmode, context);
/* Recursion occurs during execution phase */
pass = AT_PASS_DROP;
break;
@@ -3983,7 +4022,7 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
ATSimplePermissions(rel, ATT_TABLE);
/* This command never recurses */
/* No command-specific prep needed */
- pass = AT_PASS_ADD_CONSTR;
+ pass = AT_PASS_ADD_INDEXCONSTR;
break;
case AT_DropConstraint: /* DROP CONSTRAINT */
ATSimplePermissions(rel, ATT_TABLE | ATT_FOREIGN_TABLE);
@@ -3997,8 +4036,13 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
case AT_AlterColumnType: /* ALTER COLUMN TYPE */
ATSimplePermissions(rel,
ATT_TABLE | ATT_COMPOSITE_TYPE | ATT_FOREIGN_TABLE);
+ /* See comments for ATPrepAlterColumnType */
+ cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, recurse, lockmode,
+ AT_PASS_UNSET, context);
+ Assert(cmd != NULL);
/* Performs own recursion */
- ATPrepAlterColumnType(wqueue, tab, rel, recurse, recursing, cmd, lockmode);
+ ATPrepAlterColumnType(wqueue, tab, rel, recurse, recursing, cmd,
+ lockmode, context);
pass = AT_PASS_ALTER_TYPE;
break;
case AT_AlterColumnGenericOptions:
@@ -4021,6 +4065,10 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
break;
case AT_SetLogged: /* SET LOGGED */
ATSimplePermissions(rel, ATT_TABLE);
+ if (tab->chgPersistence)
+ ereport(ERROR,
+ (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+ errmsg("cannot change persistence setting twice")));
tab->chgPersistence = ATPrepChangePersistence(rel, true);
/* force rewrite if necessary; see comment in ATRewriteTables */
if (tab->chgPersistence)
@@ -4032,6 +4080,10 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
break;
case AT_SetUnLogged: /* SET UNLOGGED */
ATSimplePermissions(rel, ATT_TABLE);
+ if (tab->chgPersistence)
+ ereport(ERROR,
+ (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+ errmsg("cannot change persistence setting twice")));
tab->chgPersistence = ATPrepChangePersistence(rel, false);
/* force rewrite if necessary; see comment in ATRewriteTables */
if (tab->chgPersistence)
@@ -4151,7 +4203,8 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
* conflicts).
*/
static void
-ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode)
+ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode,
+ AlterTableUtilityContext *context)
{
int pass;
ListCell *ltab;
@@ -4184,7 +4237,7 @@ ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode)
foreach(lcmd, subcmds)
ATExecCmd(wqueue, tab, rel,
castNode(AlterTableCmd, lfirst(lcmd)),
- lockmode);
+ lockmode, pass, context);
/*
* After the ALTER TYPE pass, do cleanup work (this is not done in
@@ -4221,7 +4274,8 @@ ATRewriteCatalogs(List **wqueue, LOCKMODE lockmode)
*/
static void
ATExecCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
- AlterTableCmd *cmd, LOCKMODE lockmode)
+ AlterTableCmd *cmd, LOCKMODE lockmode, int cur_pass,
+ AlterTableUtilityContext *context)
{
ObjectAddress address = InvalidObjectAddress;
@@ -4229,22 +4283,28 @@ ATExecCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
{
case AT_AddColumn: /* ADD COLUMN */
case AT_AddColumnToView: /* add column via CREATE OR REPLACE VIEW */
- address = ATExecAddColumn(wqueue, tab, rel, (ColumnDef *) cmd->def,
+ address = ATExecAddColumn(wqueue, tab, rel, &cmd,
false, false,
- cmd->missing_ok, lockmode);
+ lockmode, cur_pass, context);
break;
case AT_AddColumnRecurse:
- address = ATExecAddColumn(wqueue, tab, rel, (ColumnDef *) cmd->def,
+ address = ATExecAddColumn(wqueue, tab, rel, &cmd,
true, false,
- cmd->missing_ok, lockmode);
+ lockmode, cur_pass, context);
break;
case AT_ColumnDefault: /* ALTER COLUMN DEFAULT */
address = ATExecColumnDefault(rel, cmd->name, cmd->def, lockmode);
break;
case AT_AddIdentity:
+ cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
+ cur_pass, context);
+ Assert(cmd != NULL);
address = ATExecAddIdentity(rel, cmd->name, cmd->def, lockmode);
break;
case AT_SetIdentity:
+ cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
+ cur_pass, context);
+ Assert(cmd != NULL);
address = ATExecSetIdentity(rel, cmd->name, cmd->def, lockmode);
break;
case AT_DropIdentity:
@@ -4292,14 +4352,24 @@ ATExecCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
lockmode);
break;
case AT_AddConstraint: /* ADD CONSTRAINT */
- address =
- ATExecAddConstraint(wqueue, tab, rel, (Constraint *) cmd->def,
- false, false, lockmode);
+ cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
+ cur_pass, context);
+ /* Might not have gotten AddConstraint back from parse transform */
+ if (cmd != NULL)
+ address =
+ ATExecAddConstraint(wqueue, tab, rel,
+ (Constraint *) cmd->def,
+ false, false, lockmode);
break;
case AT_AddConstraintRecurse: /* ADD CONSTRAINT with recursion */
- address =
- ATExecAddConstraint(wqueue, tab, rel, (Constraint *) cmd->def,
- true, false, lockmode);
+ cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, true, lockmode,
+ cur_pass, context);
+ /* Might not have gotten AddConstraint back from parse transform */
+ if (cmd != NULL)
+ address =
+ ATExecAddConstraint(wqueue, tab, rel,
+ (Constraint *) cmd->def,
+ true, false, lockmode);
break;
case AT_ReAddConstraint: /* Re-add pre-existing check constraint */
address =
@@ -4343,6 +4413,7 @@ ATExecCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
cmd->missing_ok, lockmode);
break;
case AT_AlterColumnType: /* ALTER COLUMN TYPE */
+ /* parse transformation was done earlier */
address = ATExecAlterColumnType(tab, rel, cmd, lockmode);
break;
case AT_AlterColumnGenericOptions: /* ALTER COLUMN OPTIONS */
@@ -4465,6 +4536,9 @@ ATExecCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
ATExecGenericOptions(rel, (List *) cmd->def);
break;
case AT_AttachPartition:
+ cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
+ cur_pass, context);
+ Assert(cmd != NULL);
if (rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE)
ATExecAttachPartition(wqueue, rel, (PartitionCmd *) cmd->def);
else
@@ -4472,6 +4546,9 @@ ATExecCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
((PartitionCmd *) cmd->def)->name);
break;
case AT_DetachPartition:
+ cmd = ATParseTransformCmd(wqueue, tab, rel, cmd, false, lockmode,
+ cur_pass, context);
+ Assert(cmd != NULL);
/* ATPrepCmd ensures it must be a table */
Assert(rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE);
ATExecDetachPartition(rel, ((PartitionCmd *) cmd->def)->name);
@@ -4485,7 +4562,8 @@ ATExecCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
/*
* Report the subcommand to interested event triggers.
*/
- EventTriggerCollectAlterTableSubcmd((Node *) cmd, address);
+ if (cmd)
+ EventTriggerCollectAlterTableSubcmd((Node *) cmd, address);
/*
* Bump the command counter to ensure the next subcommand in the sequence
@@ -4495,10 +4573,143 @@ ATExecCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
}
/*
+ * ATParseTransformCmd: perform parse transformation for one subcommand
+ *
+ * Returns the transformed subcommand tree, if there is one, else NULL.
+ *
+ * The parser may hand back additional AlterTableCmd(s) and/or other
+ * utility statements, either before or after the original subcommand.
+ * Other AlterTableCmds are scheduled into the appropriate slot of the
+ * AlteredTableInfo (they had better be for later passes than the current one).
+ * Utility statements that are supposed to happen before the AlterTableCmd
+ * are executed immediately. Those that are supposed to happen afterwards
+ * are added to the tab->afterStmts list to be done at the very end.
+ */
+static AlterTableCmd *
+ATParseTransformCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
+ AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
+ int cur_pass, AlterTableUtilityContext *context)
+{
+ AlterTableCmd *newcmd = NULL;
+ AlterTableStmt *atstmt = makeNode(AlterTableStmt);
+ List *beforeStmts;
+ List *afterStmts;
+ ListCell *lc;
+
+ /* Gin up an AlterTableStmt with just this subcommand and this table */
+ atstmt->relation =
+ makeRangeVar(get_namespace_name(RelationGetNamespace(rel)),
+ pstrdup(RelationGetRelationName(rel)),
+ -1);
+ atstmt->relation->inh = recurse;
+ atstmt->cmds = list_make1(cmd);
+ atstmt->relkind = OBJECT_TABLE; /* needn't be picky here */
+ atstmt->missing_ok = false;
+
+ /* Transform the AlterTableStmt */
+ atstmt = transformAlterTableStmt(RelationGetRelid(rel),
+ atstmt,
+ context->queryString,
+ &beforeStmts,
+ &afterStmts);
+
+ /* Execute any statements that should happen before these subcommand(s) */
+ foreach(lc, beforeStmts)
+ {
+ Node *stmt = (Node *) lfirst(lc);
+
+ ProcessUtilityForAlterTable(stmt, context);
+ CommandCounterIncrement();
+ }
+
+ /* Examine the transformed subcommands and schedule them appropriately */
+ foreach(lc, atstmt->cmds)
+ {
+ AlterTableCmd *cmd2 = lfirst_node(AlterTableCmd, lc);
+
+ if (newcmd == NULL &&
+ (cmd->subtype == cmd2->subtype ||
+ (cmd->subtype == AT_AddConstraintRecurse &&
+ cmd2->subtype == AT_AddConstraint)))
+ {
+ /* Found the transformed version of our subcommand */
+ cmd2->subtype = cmd->subtype; /* copy recursion flag */
+ newcmd = cmd2;
+ }
+ else
+ {
+ int pass;
+
+ /*
+ * Schedule added subcommand appropriately. We assume we needn't
+ * do any phase-1 checks for it. This switch only has to cover
+ * the subcommand types that can be added by parse_utilcmd.c.
+ */
+ switch (cmd2->subtype)
+ {
+ case AT_SetNotNull:
+ /* Need command-specific recursion decision */
+ ATPrepSetNotNull(wqueue, rel, cmd2,
+ recurse, false,
+ lockmode, context);
+ pass = AT_PASS_COL_ATTRS;
+ break;
+ case AT_AddIndex:
+ /* This command never recurses */
+ /* No command-specific prep needed */
+ pass = AT_PASS_ADD_INDEX;
+ break;
+ case AT_AddIndexConstraint:
+ /* This command never recurses */
+ /* No command-specific prep needed */
+ pass = AT_PASS_ADD_INDEXCONSTR;
+ break;
+ case AT_AddConstraint:
+ /* Recursion occurs during execution phase */
+ if (recurse)
+ cmd2->subtype = AT_AddConstraintRecurse;
+ switch (castNode(Constraint, cmd2->def)->contype)
+ {
+ case CONSTR_PRIMARY:
+ case CONSTR_UNIQUE:
+ case CONSTR_EXCLUSION:
+ pass = AT_PASS_ADD_INDEXCONSTR;
+ break;
+ default:
+ pass = AT_PASS_ADD_OTHERCONSTR;
+ break;
+ }
+ break;
+ case AT_AlterColumnGenericOptions:
+ /* This command never recurses */
+ /* No command-specific prep needed */
+ pass = AT_PASS_MISC;
+ break;
+ default:
+ elog(ERROR, "unexpected AlterTableType: %d",
+ (int) cmd2->subtype);
+ pass = AT_PASS_UNSET;
+ break;
+ }
+ /* Must be for a later pass than we're currently doing */
+ if (pass <= cur_pass)
+ elog(ERROR, "ALTER TABLE scheduling failure");
+ tab->subcmds[pass] = lappend(tab->subcmds[pass], cmd2);
+ }
+ }
+
+ /* Queue up any after-statements to happen at the end */
+ tab->afterStmts = list_concat(tab->afterStmts, afterStmts);
+
+ return newcmd;
+}
+
+/*
* ATRewriteTables: ALTER TABLE phase 3
*/
static void
-ATRewriteTables(AlterTableStmt *parsetree, List **wqueue, LOCKMODE lockmode)
+ATRewriteTables(AlterTableStmt *parsetree, List **wqueue, LOCKMODE lockmode,
+ AlterTableUtilityContext *context)
{
ListCell *ltab;
@@ -4725,6 +4936,21 @@ ATRewriteTables(AlterTableStmt *parsetree, List **wqueue, LOCKMODE lockmode)
if (rel)
table_close(rel, NoLock);
}
+
+ /* Finally, run any afterStmts that were queued up */
+ foreach(ltab, *wqueue)
+ {
+ AlteredTableInfo *tab = (AlteredTableInfo *) lfirst(ltab);
+ ListCell *lc;
+
+ foreach(lc, tab->afterStmts)
+ {
+ Node *stmt = (Node *) lfirst(lc);
+
+ ProcessUtilityForAlterTable(stmt, context);
+ CommandCounterIncrement();
+ }
+ }
}
/*
@@ -4896,8 +5122,8 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap, LOCKMODE lockmode)
/*
* Set all columns in the new slot to NULL initially, to ensure
- * columns added as part of the rewrite are initialized to
- * NULL. That is necessary as tab->newvals will not contain an
+ * columns added as part of the rewrite are initialized to NULL.
+ * That is necessary as tab->newvals will not contain an
* expression for columns with a NULL default, e.g. when adding a
* column without a default together with a column with a default
* requiring an actual rewrite.
@@ -5236,7 +5462,8 @@ ATWrongRelkindError(Relation rel, int allowed_targets)
*/
static void
ATSimpleRecursion(List **wqueue, Relation rel,
- AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode)
+ AlterTableCmd *cmd, bool recurse, LOCKMODE lockmode,
+ AlterTableUtilityContext *context)
{
/*
* Propagate to children if desired. Only plain tables, foreign tables
@@ -5269,7 +5496,7 @@ ATSimpleRecursion(List **wqueue, Relation rel,
/* find_all_inheritors already got lock */
childrel = relation_open(childrelid, NoLock);
CheckTableNotInUse(childrel, "ALTER TABLE");
- ATPrepCmd(wqueue, childrel, cmd, false, true, lockmode);
+ ATPrepCmd(wqueue, childrel, cmd, false, true, lockmode, context);
relation_close(childrel, NoLock);
}
}
@@ -5314,7 +5541,7 @@ ATCheckPartitionsNotInUse(Relation rel, LOCKMODE lockmode)
*/
static void
ATTypedTableRecursion(List **wqueue, Relation rel, AlterTableCmd *cmd,
- LOCKMODE lockmode)
+ LOCKMODE lockmode, AlterTableUtilityContext *context)
{
ListCell *child;
List *children;
@@ -5332,7 +5559,7 @@ ATTypedTableRecursion(List **wqueue, Relation rel, AlterTableCmd *cmd,
childrel = relation_open(childrelid, lockmode);
CheckTableNotInUse(childrel, "ALTER TABLE");
- ATPrepCmd(wqueue, childrel, cmd, true, true, lockmode);
+ ATPrepCmd(wqueue, childrel, cmd, true, true, lockmode, context);
relation_close(childrel, NoLock);
}
}
@@ -5569,7 +5796,8 @@ check_of_type(HeapTuple typetuple)
*/
static void
ATPrepAddColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
- bool is_view, AlterTableCmd *cmd, LOCKMODE lockmode)
+ bool is_view, AlterTableCmd *cmd, LOCKMODE lockmode,
+ AlterTableUtilityContext *context)
{
if (rel->rd_rel->reloftype && !recursing)
ereport(ERROR,
@@ -5577,7 +5805,7 @@ ATPrepAddColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
errmsg("cannot add column to typed table")));
if (rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
- ATTypedTableRecursion(wqueue, rel, cmd, lockmode);
+ ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
if (recurse && !is_view)
cmd->subtype = AT_AddColumnRecurse;
@@ -5586,14 +5814,20 @@ ATPrepAddColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
/*
* Add a column to a table. The return value is the address of the
* new column in the parent relation.
+ *
+ * cmd is pass-by-ref so that we can replace it with the parse-transformed
+ * copy (but that happens only after we check for IF NOT EXISTS).
*/
static ObjectAddress
ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
- ColumnDef *colDef,
+ AlterTableCmd **cmd,
bool recurse, bool recursing,
- bool if_not_exists, LOCKMODE lockmode)
+ LOCKMODE lockmode, int cur_pass,
+ AlterTableUtilityContext *context)
{
Oid myrelid = RelationGetRelid(rel);
+ ColumnDef *colDef = castNode(ColumnDef, (*cmd)->def);
+ bool if_not_exists = (*cmd)->missing_ok;
Relation pgclass,
attrdesc;
HeapTuple reltup;
@@ -5608,6 +5842,7 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
Expr *defval;
List *children;
ListCell *child;
+ AlterTableCmd *childcmd;
AclResult aclresult;
ObjectAddress address;
@@ -5675,12 +5910,31 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
}
}
- pgclass = table_open(RelationRelationId, RowExclusiveLock);
+ /* skip if the name already exists and if_not_exists is true */
+ if (!check_for_column_name_collision(rel, colDef->colname, if_not_exists))
+ {
+ table_close(attrdesc, RowExclusiveLock);
+ return InvalidObjectAddress;
+ }
- reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(myrelid));
- if (!HeapTupleIsValid(reltup))
- elog(ERROR, "cache lookup failed for relation %u", myrelid);
- relkind = ((Form_pg_class) GETSTRUCT(reltup))->relkind;
+ /*
+ * Okay, we need to add the column, so go ahead and do parse
+ * transformation. This can result in queueing up, or even immediately
+ * executing, subsidiary operations (such as creation of unique indexes);
+ * so we mustn't do it until we have made the if_not_exists check.
+ *
+ * When recursing, the command was already transformed and we needn't do
+ * so again. Also, if context isn't given we can't transform. (That
+ * currently happens only for AT_AddColumnToView; we expect that view.c
+ * passed us a ColumnDef that doesn't need work.)
+ */
+ if (context != NULL && !recursing)
+ {
+ *cmd = ATParseTransformCmd(wqueue, tab, rel, *cmd, recurse, lockmode,
+ cur_pass, context);
+ Assert(*cmd != NULL);
+ colDef = castNode(ColumnDef, (*cmd)->def);
+ }
/*
* Cannot add identity column if table has children, because identity does
@@ -5693,14 +5947,12 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
(errcode(ERRCODE_INVALID_TABLE_DEFINITION),
errmsg("cannot recursively add identity column to table that has child tables")));
- /* skip if the name already exists and if_not_exists is true */
- if (!check_for_column_name_collision(rel, colDef->colname, if_not_exists))
- {
- table_close(attrdesc, RowExclusiveLock);
- heap_freetuple(reltup);
- table_close(pgclass, RowExclusiveLock);
- return InvalidObjectAddress;
- }
+ pgclass = table_open(RelationRelationId, RowExclusiveLock);
+
+ reltup = SearchSysCacheCopy1(RELOID, ObjectIdGetDatum(myrelid));
+ if (!HeapTupleIsValid(reltup))
+ elog(ERROR, "cache lookup failed for relation %u", myrelid);
+ relkind = ((Form_pg_class) GETSTRUCT(reltup))->relkind;
/* Determine the new attribute's number */
newattnum = ((Form_pg_class) GETSTRUCT(reltup))->relnatts + 1;
@@ -5930,10 +6182,13 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
/* Children should see column as singly inherited */
if (!recursing)
{
- colDef = copyObject(colDef);
+ childcmd = copyObject(*cmd);
+ colDef = castNode(ColumnDef, childcmd->def);
colDef->inhcount = 1;
colDef->is_local = false;
}
+ else
+ childcmd = *cmd; /* no need to copy again */
foreach(child, children)
{
@@ -5950,8 +6205,8 @@ ATExecAddColumn(List **wqueue, AlteredTableInfo *tab, Relation rel,
/* Recurse to child; return value is ignored */
ATExecAddColumn(wqueue, childtab, childrel,
- colDef, recurse, true,
- if_not_exists, lockmode);
+ &childcmd, recurse, true,
+ lockmode, cur_pass, context);
table_close(childrel, NoLock);
}
@@ -6210,7 +6465,7 @@ ATExecDropNotNull(Relation rel, const char *colName, LOCKMODE lockmode)
static void
ATPrepSetNotNull(List **wqueue, Relation rel,
AlterTableCmd *cmd, bool recurse, bool recursing,
- LOCKMODE lockmode)
+ LOCKMODE lockmode, AlterTableUtilityContext *context)
{
/*
* If we're already recursing, there's nothing to do; the topmost
@@ -6231,10 +6486,10 @@ ATPrepSetNotNull(List **wqueue, Relation rel,
newcmd->subtype = AT_CheckNotNull;
newcmd->name = pstrdup(cmd->name);
- ATSimpleRecursion(wqueue, rel, newcmd, true, lockmode);
+ ATSimpleRecursion(wqueue, rel, newcmd, true, lockmode, context);
}
else
- ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode);
+ ATSimpleRecursion(wqueue, rel, cmd, recurse, lockmode, context);
}
/*
@@ -7001,7 +7256,8 @@ ATExecSetStorage(Relation rel, const char *colName, Node *newValue, LOCKMODE loc
*/
static void
ATPrepDropColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
- AlterTableCmd *cmd, LOCKMODE lockmode)
+ AlterTableCmd *cmd, LOCKMODE lockmode,
+ AlterTableUtilityContext *context)
{
if (rel->rd_rel->reloftype && !recursing)
ereport(ERROR,
@@ -7009,7 +7265,7 @@ ATPrepDropColumn(List **wqueue, Relation rel, bool recurse, bool recursing,
errmsg("cannot drop column from typed table")));
if (rel->rd_rel->relkind == RELKIND_COMPOSITE_TYPE)
- ATTypedTableRecursion(wqueue, rel, cmd, lockmode);
+ ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
if (recurse)
cmd->subtype = AT_DropColumnRecurse;
@@ -10261,12 +10517,27 @@ ATExecDropConstraint(Relation rel, const char *constrName,
/*
* ALTER COLUMN TYPE
+ *
+ * Unlike other subcommand types, we do parse transformation for ALTER COLUMN
+ * TYPE during phase 1 --- the AlterTableCmd passed in here is already
+ * transformed (and must be, because we rely on some transformed fields).
+ *
+ * The point of this is that the execution of all ALTER COLUMN TYPEs for a
+ * table will be done "in parallel" during phase 3, so all the USING
+ * expressions should be parsed assuming the original column types. Also,
+ * this allows a USING expression to refer to a field that will be dropped.
+ *
+ * To make this work safely, AT_PASS_DROP then AT_PASS_ALTER_TYPE must be
+ * the first two execution steps in phase 2; they must not see the effects
+ * of any other subcommand types, since the USING expressions are parsed
+ * against the unmodified table's state.
*/
static void
ATPrepAlterColumnType(List **wqueue,
AlteredTableInfo *tab, Relation rel,
bool recurse, bool recursing,
- AlterTableCmd *cmd, LOCKMODE lockmode)
+ AlterTableCmd *cmd, LOCKMODE lockmode,
+ AlterTableUtilityContext *context)
{
char *colName = cmd->name;
ColumnDef *def = (ColumnDef *) cmd->def;
@@ -10512,7 +10783,7 @@ ATPrepAlterColumnType(List **wqueue,
errdetail("USING expression contains a whole-row table reference.")));
pfree(attmap);
}
- ATPrepCmd(wqueue, childrel, cmd, false, true, lockmode);
+ ATPrepCmd(wqueue, childrel, cmd, false, true, lockmode, context);
relation_close(childrel, NoLock);
}
}
@@ -10524,7 +10795,7 @@ ATPrepAlterColumnType(List **wqueue,
colName)));
if (tab->relkind == RELKIND_COMPOSITE_TYPE)
- ATTypedTableRecursion(wqueue, rel, cmd, lockmode);
+ ATTypedTableRecursion(wqueue, rel, cmd, lockmode, context);
}
/*
@@ -11303,10 +11574,19 @@ ATPostAlterTypeParse(Oid oldId, Oid oldRelId, Oid refRelId, char *cmd,
(IndexStmt *) stmt,
cmd));
else if (IsA(stmt, AlterTableStmt))
- querytree_list = list_concat(querytree_list,
- transformAlterTableStmt(oldRelId,
- (AlterTableStmt *) stmt,
- cmd));
+ {
+ List *beforeStmts;
+ List *afterStmts;
+
+ stmt = (Node *) transformAlterTableStmt(oldRelId,
+ (AlterTableStmt *) stmt,
+ cmd,
+ &beforeStmts,
+ &afterStmts);
+ querytree_list = list_concat(querytree_list, beforeStmts);
+ querytree_list = lappend(querytree_list, stmt);
+ querytree_list = list_concat(querytree_list, afterStmts);
+ }
else
querytree_list = lappend(querytree_list, stmt);
}
diff --git a/src/backend/commands/view.c b/src/backend/commands/view.c
index bea890f..20e0a88 100644
--- a/src/backend/commands/view.c
+++ b/src/backend/commands/view.c
@@ -146,6 +146,10 @@ DefineVirtualRelation(RangeVar *relation, List *tlist, bool replace,
* Note that we must do this before updating the query for the view,
* since the rules system requires that the correct view columns be in
* place when defining the new rules.
+ *
+ * Also note that ALTER TABLE doesn't run parse transformation on
+ * AT_AddColumnToView commands. The ColumnDef we supply must be ready
+ * to execute as-is.
*/
if (list_length(attrList) > rel->rd_att->natts)
{
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index ee47547..29717db 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -347,7 +347,8 @@ transformCreateStmt(CreateStmt *stmt, const char *queryString)
*/
static void
generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
- Oid seqtypid, List *seqoptions, bool for_identity,
+ Oid seqtypid, List *seqoptions,
+ bool for_identity, bool col_exists,
char **snamespace_p, char **sname_p)
{
ListCell *option;
@@ -472,8 +473,12 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
/*
* Build an ALTER SEQUENCE ... OWNED BY command to mark the sequence as
- * owned by this column, and add it to the list of things to be done after
- * this CREATE/ALTER TABLE.
+ * owned by this column, and add it to the appropriate list of things to
+ * be done along with this CREATE/ALTER TABLE. In a CREATE or ALTER ADD
+ * COLUMN, it must be done after the statement because we don't know the
+ * column's attnum yet. But if we do have the attnum (in AT_AddIdentity),
+ * we can do the marking immediately, which improves some ALTER TABLE
+ * behaviors.
*/
altseqstmt = makeNode(AlterSeqStmt);
altseqstmt->sequence = makeRangeVar(snamespace, sname, -1);
@@ -484,7 +489,10 @@ generateSerialExtraStmts(CreateStmtContext *cxt, ColumnDef *column,
(Node *) attnamelist, -1));
altseqstmt->for_identity = for_identity;
- cxt->alist = lappend(cxt->alist, altseqstmt);
+ if (col_exists)
+ cxt->blist = lappend(cxt->blist, altseqstmt);
+ else
+ cxt->alist = lappend(cxt->alist, altseqstmt);
if (snamespace_p)
*snamespace_p = snamespace;
@@ -568,7 +576,8 @@ transformColumnDefinition(CreateStmtContext *cxt, ColumnDef *column)
Constraint *constraint;
generateSerialExtraStmts(cxt, column,
- column->typeName->typeOid, NIL, false,
+ column->typeName->typeOid, NIL,
+ false, false,
&snamespace, &sname);
/*
@@ -684,7 +693,8 @@ transformColumnDefinition(CreateStmtContext *cxt, ColumnDef *column)
constraint->location)));
generateSerialExtraStmts(cxt, column,
- typeOid, constraint->options, true,
+ typeOid, constraint->options,
+ true, false,
NULL, NULL);
column->identity = constraint->generated_when;
@@ -1086,7 +1096,8 @@ transformTableLikeClause(CreateStmtContext *cxt, TableLikeClause *table_like_cla
seq_relid = getIdentitySequence(RelationGetRelid(relation), attribute->attnum, false);
seq_options = sequence_options(seq_relid);
generateSerialExtraStmts(cxt, def,
- InvalidOid, seq_options, true,
+ InvalidOid, seq_options,
+ true, false,
NULL, NULL);
def->identity = attribute->attidentity;
}
@@ -2570,7 +2581,7 @@ transformFKConstraints(CreateStmtContext *cxt,
Constraint *constraint = (Constraint *) lfirst(fkclist);
AlterTableCmd *altercmd = makeNode(AlterTableCmd);
- altercmd->subtype = AT_ProcessedConstraint;
+ altercmd->subtype = AT_AddConstraint;
altercmd->name = NULL;
altercmd->def = (Node *) constraint;
alterstmt->cmds = lappend(alterstmt->cmds, altercmd);
@@ -3000,23 +3011,23 @@ transformRuleStmt(RuleStmt *stmt, const char *queryString,
* transformAlterTableStmt -
* parse analysis for ALTER TABLE
*
- * Returns a List of utility commands to be done in sequence. One of these
- * will be the transformed AlterTableStmt, but there may be additional actions
- * to be done before and after the actual AlterTable() call.
+ * Returns the transformed AlterTableStmt. There may be additional actions
+ * to be done before and after the transformed statement, which are returned
+ * in *beforeStmts and *afterStmts as lists of utility command parsetrees.
*
* To avoid race conditions, it's important that this function rely only on
* the passed-in relid (and not on stmt->relation) to determine the target
* relation.
*/
-List *
+AlterTableStmt *
transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
- const char *queryString)
+ const char *queryString,
+ List **beforeStmts, List **afterStmts)
{
Relation rel;
TupleDesc tupdesc;
ParseState *pstate;
CreateStmtContext cxt;
- List *result;
List *save_alist;
ListCell *lcmd,
*l;
@@ -3048,7 +3059,7 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
/* Set up CreateStmtContext */
cxt.pstate = pstate;
- if (stmt->relkind == OBJECT_FOREIGN_TABLE)
+ if (rel->rd_rel->relkind == RELKIND_FOREIGN_TABLE)
{
cxt.stmtType = "ALTER FOREIGN TABLE";
cxt.isforeign = true;
@@ -3076,9 +3087,8 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
cxt.ofType = false;
/*
- * The only subtypes that currently require parse transformation handling
- * are ADD COLUMN, ADD CONSTRAINT and SET DATA TYPE. These largely re-use
- * code from CREATE TABLE.
+ * Transform ALTER subcommands that need it (most don't). These largely
+ * re-use code from CREATE TABLE.
*/
foreach(lcmd, stmt->cmds)
{
@@ -3087,7 +3097,7 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
switch (cmd->subtype)
{
case AT_AddColumn:
- case AT_AddColumnToView:
+ case AT_AddColumnRecurse:
{
ColumnDef *def = castNode(ColumnDef, cmd->def);
@@ -3111,6 +3121,7 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
}
case AT_AddConstraint:
+ case AT_AddConstraintRecurse:
/*
* The original AddConstraint cmd node doesn't go to newcmds
@@ -3126,19 +3137,9 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
(int) nodeTag(cmd->def));
break;
- case AT_ProcessedConstraint:
-
- /*
- * Already-transformed ADD CONSTRAINT, so just make it look
- * like the standard case.
- */
- cmd->subtype = AT_AddConstraint;
- newcmds = lappend(newcmds, cmd);
- break;
-
case AT_AlterColumnType:
{
- ColumnDef *def = (ColumnDef *) cmd->def;
+ ColumnDef *def = castNode(ColumnDef, cmd->def);
AttrNumber attnum;
/*
@@ -3157,13 +3158,13 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
* change the data type of the sequence.
*/
attnum = get_attnum(relid, cmd->name);
+ if (attnum == InvalidAttrNumber)
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_COLUMN),
+ errmsg("column \"%s\" of relation \"%s\" does not exist",
+ cmd->name, RelationGetRelationName(rel))));
- /*
- * if attribute not found, something will error about it
- * later
- */
- if (attnum != InvalidAttrNumber &&
- TupleDescAttr(tupdesc, attnum - 1)->attidentity)
+ if (TupleDescAttr(tupdesc, attnum - 1)->attidentity)
{
Oid seq_relid = getIdentitySequence(relid, attnum, false);
Oid typeOid = typenameTypeId(pstate, def->typeName);
@@ -3192,16 +3193,16 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
cmd->def = (Node *) newdef;
attnum = get_attnum(relid, cmd->name);
+ if (attnum == InvalidAttrNumber)
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_COLUMN),
+ errmsg("column \"%s\" of relation \"%s\" does not exist",
+ cmd->name, RelationGetRelationName(rel))));
- /*
- * if attribute not found, something will error about it
- * later
- */
- if (attnum != InvalidAttrNumber)
- generateSerialExtraStmts(&cxt, newdef,
- get_atttype(relid, attnum),
- def->options, true,
- NULL, NULL);
+ generateSerialExtraStmts(&cxt, newdef,
+ get_atttype(relid, attnum),
+ def->options, true, true,
+ NULL, NULL);
newcmds = lappend(newcmds, cmd);
break;
@@ -3217,6 +3218,7 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
List *newseqopts = NIL;
List *newdef = NIL;
AttrNumber attnum;
+ Oid seq_relid;
/*
* Split options into those handled by ALTER SEQUENCE and
@@ -3233,29 +3235,34 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
}
attnum = get_attnum(relid, cmd->name);
+ if (attnum == InvalidAttrNumber)
+ ereport(ERROR,
+ (errcode(ERRCODE_UNDEFINED_COLUMN),
+ errmsg("column \"%s\" of relation \"%s\" does not exist",
+ cmd->name, RelationGetRelationName(rel))));
- if (attnum)
- {
- Oid seq_relid = getIdentitySequence(relid, attnum, true);
+ seq_relid = getIdentitySequence(relid, attnum, true);
- if (seq_relid)
- {
- AlterSeqStmt *seqstmt;
+ if (seq_relid)
+ {
+ AlterSeqStmt *seqstmt;
- seqstmt = makeNode(AlterSeqStmt);
- seqstmt->sequence = makeRangeVar(get_namespace_name(get_rel_namespace(seq_relid)),
- get_rel_name(seq_relid), -1);
- seqstmt->options = newseqopts;
- seqstmt->for_identity = true;
- seqstmt->missing_ok = false;
+ seqstmt = makeNode(AlterSeqStmt);
+ seqstmt->sequence = makeRangeVar(get_namespace_name(get_rel_namespace(seq_relid)),
+ get_rel_name(seq_relid), -1);
+ seqstmt->options = newseqopts;
+ seqstmt->for_identity = true;
+ seqstmt->missing_ok = false;
- cxt.alist = lappend(cxt.alist, seqstmt);
- }
+ cxt.blist = lappend(cxt.blist, seqstmt);
}
/*
- * If column was not found or was not an identity column,
- * we just let the ALTER TABLE command error out later.
+ * If column was not an identity column, we just let the
+ * ALTER TABLE command error out later. (There are cases
+ * this fails to cover, but we'll need to restructure
+ * where creation of the sequence dependency linkage
+ * happens before we can fix it.)
*/
cmd->def = (Node *) newdef;
@@ -3277,6 +3284,12 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
break;
default:
+
+ /*
+ * Currently, we shouldn't actually get here for subcommand
+ * types that don't require transformation; but if we do, just
+ * emit them unchanged.
+ */
newcmds = lappend(newcmds, cmd);
break;
}
@@ -3357,11 +3370,10 @@ transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
*/
stmt->cmds = newcmds;
- result = lappend(cxt.blist, stmt);
- result = list_concat(result, cxt.alist);
- result = list_concat(result, save_alist);
+ *beforeStmts = cxt.blist;
+ *afterStmts = list_concat(cxt.alist, save_alist);
- return result;
+ return stmt;
}
diff --git a/src/backend/tcop/utility.c b/src/backend/tcop/utility.c
index c6faa66..69edbd7 100644
--- a/src/backend/tcop/utility.c
+++ b/src/backend/tcop/utility.c
@@ -1097,8 +1097,6 @@ ProcessUtilitySlow(ParseState *pstate,
{
AlterTableStmt *atstmt = (AlterTableStmt *) parsetree;
Oid relid;
- List *stmts;
- ListCell *l;
LOCKMODE lockmode;
/*
@@ -1112,59 +1110,21 @@ ProcessUtilitySlow(ParseState *pstate,
if (OidIsValid(relid))
{
- /* Run parse analysis ... */
- stmts = transformAlterTableStmt(relid, atstmt,
- queryString);
+ AlterTableUtilityContext atcontext;
+
+ /* Set up info needed for recursive callbacks ... */
+ atcontext.pstmt = pstmt;
+ atcontext.queryString = queryString;
+ atcontext.relid = relid;
+ atcontext.params = params;
+ atcontext.queryEnv = queryEnv;
/* ... ensure we have an event trigger context ... */
EventTriggerAlterTableStart(parsetree);
EventTriggerAlterTableRelid(relid);
/* ... and do it */
- foreach(l, stmts)
- {
- Node *stmt = (Node *) lfirst(l);
-
- if (IsA(stmt, AlterTableStmt))
- {
- /* Do the table alteration proper */
- AlterTable(relid, lockmode,
- (AlterTableStmt *) stmt);
- }
- else
- {
- /*
- * Recurse for anything else. If we need to
- * do so, "close" the current complex-command
- * set, and start a new one at the bottom;
- * this is needed to ensure the ordering of
- * queued commands is consistent with the way
- * they are executed here.
- */
- PlannedStmt *wrapper;
-
- EventTriggerAlterTableEnd();
- wrapper = makeNode(PlannedStmt);
- wrapper->commandType = CMD_UTILITY;
- wrapper->canSetTag = false;
- wrapper->utilityStmt = stmt;
- wrapper->stmt_location = pstmt->stmt_location;
- wrapper->stmt_len = pstmt->stmt_len;
- ProcessUtility(wrapper,
- queryString,
- PROCESS_UTILITY_SUBCOMMAND,
- params,
- NULL,
- None_Receiver,
- NULL);
- EventTriggerAlterTableStart(parsetree);
- EventTriggerAlterTableRelid(relid);
- }
-
- /* Need CCI between commands */
- if (lnext(stmts, l) != NULL)
- CommandCounterIncrement();
- }
+ AlterTable(atstmt, lockmode, &atcontext);
/* done */
EventTriggerAlterTableEnd();
@@ -1729,6 +1689,52 @@ ProcessUtilitySlow(ParseState *pstate,
}
/*
+ * ProcessUtilityForAlterTable
+ * Recursive entry from ALTER TABLE
+ *
+ * ALTER TABLE sometimes generates subcommands such as CREATE INDEX.
+ * It calls this, not the main entry point ProcessUtility, to execute
+ * such subcommands.
+ *
+ * stmt: the utility command to execute
+ * context: opaque passthrough struct with the info we need
+ *
+ * It's caller's responsibility to do CommandCounterIncrement after
+ * calling this, if needed.
+ */
+void
+ProcessUtilityForAlterTable(Node *stmt, AlterTableUtilityContext *context)
+{
+ PlannedStmt *wrapper;
+
+ /*
+ * For event triggers, we must "close" the current complex-command set,
+ * and start a new one afterwards; this is needed to ensure the ordering
+ * of command events is consistent with the way they were executed.
+ */
+ EventTriggerAlterTableEnd();
+
+ /* Create a suitable wrapper */
+ wrapper = makeNode(PlannedStmt);
+ wrapper->commandType = CMD_UTILITY;
+ wrapper->canSetTag = false;
+ wrapper->utilityStmt = stmt;
+ wrapper->stmt_location = context->pstmt->stmt_location;
+ wrapper->stmt_len = context->pstmt->stmt_len;
+
+ ProcessUtility(wrapper,
+ context->queryString,
+ PROCESS_UTILITY_SUBCOMMAND,
+ context->params,
+ context->queryEnv,
+ None_Receiver,
+ NULL);
+
+ EventTriggerAlterTableStart(context->pstmt->utilityStmt);
+ EventTriggerAlterTableRelid(context->relid);
+}
+
+/*
* Dispatch function for DropStmt
*/
static void
diff --git a/src/include/commands/tablecmds.h b/src/include/commands/tablecmds.h
index 9c25a80..7245f83 100644
--- a/src/include/commands/tablecmds.h
+++ b/src/include/commands/tablecmds.h
@@ -21,6 +21,8 @@
#include "storage/lock.h"
#include "utils/relcache.h"
+struct AlterTableUtilityContext; /* avoid including tcop/utility.h here */
+
extern ObjectAddress DefineRelation(CreateStmt *stmt, char relkind, Oid ownerId,
ObjectAddress *typaddress, const char *queryString);
@@ -29,7 +31,8 @@ extern void RemoveRelations(DropStmt *drop);
extern Oid AlterTableLookupRelation(AlterTableStmt *stmt, LOCKMODE lockmode);
-extern void AlterTable(Oid relid, LOCKMODE lockmode, AlterTableStmt *stmt);
+extern void AlterTable(AlterTableStmt *stmt, LOCKMODE lockmode,
+ struct AlterTableUtilityContext *context);
extern LOCKMODE AlterTableGetLockLevel(List *cmds);
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h
index d93a79a..bc8418e 100644
--- a/src/include/nodes/parsenodes.h
+++ b/src/include/nodes/parsenodes.h
@@ -1780,8 +1780,6 @@ typedef enum AlterTableType
AT_AlterConstraint, /* alter constraint */
AT_ValidateConstraint, /* validate constraint */
AT_ValidateConstraintRecurse, /* internal to commands/tablecmds.c */
- AT_ProcessedConstraint, /* pre-processed add constraint (local in
- * parser/parse_utilcmd.c) */
AT_AddIndexConstraint, /* add constraint using existing index */
AT_DropConstraint, /* drop constraint */
AT_DropConstraintRecurse, /* internal to commands/tablecmds.c */
diff --git a/src/include/parser/parse_utilcmd.h b/src/include/parser/parse_utilcmd.h
index 1348064..7d640cf 100644
--- a/src/include/parser/parse_utilcmd.h
+++ b/src/include/parser/parse_utilcmd.h
@@ -18,8 +18,10 @@
extern List *transformCreateStmt(CreateStmt *stmt, const char *queryString);
-extern List *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
- const char *queryString);
+extern AlterTableStmt *transformAlterTableStmt(Oid relid, AlterTableStmt *stmt,
+ const char *queryString,
+ List **beforeStmts,
+ List **afterStmts);
extern IndexStmt *transformIndexStmt(Oid relid, IndexStmt *stmt,
const char *queryString);
extern void transformRuleStmt(RuleStmt *stmt, const char *queryString,
diff --git a/src/include/tcop/utility.h b/src/include/tcop/utility.h
index 5abcacf..d8f5d4f 100644
--- a/src/include/tcop/utility.h
+++ b/src/include/tcop/utility.h
@@ -25,6 +25,16 @@ typedef enum
PROCESS_UTILITY_SUBCOMMAND /* a portion of a query */
} ProcessUtilityContext;
+/* Info needed when recursing from ALTER TABLE */
+typedef struct AlterTableUtilityContext
+{
+ PlannedStmt *pstmt; /* PlannedStmt for outer ALTER TABLE command */
+ const char *queryString; /* its query string */
+ Oid relid; /* OID of ALTER's target table */
+ ParamListInfo params; /* any parameters available to ALTER TABLE */
+ QueryEnvironment *queryEnv; /* execution environment for ALTER TABLE */
+} AlterTableUtilityContext;
+
/* Hook for plugins to get control in ProcessUtility() */
typedef void (*ProcessUtility_hook_type) (PlannedStmt *pstmt,
const char *queryString, ProcessUtilityContext context,
@@ -42,6 +52,9 @@ extern void standard_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
QueryEnvironment *queryEnv,
DestReceiver *dest, char *completionTag);
+extern void ProcessUtilityForAlterTable(Node *stmt,
+ AlterTableUtilityContext *context);
+
extern bool UtilityReturnsTuples(Node *parsetree);
extern TupleDesc UtilityTupleDescriptor(Node *parsetree);
diff --git a/src/test/modules/test_ddl_deparse/test_ddl_deparse.c
b/src/test/modules/test_ddl_deparse/test_ddl_deparse.c
index 7f77f19..04d963b 100644
--- a/src/test/modules/test_ddl_deparse/test_ddl_deparse.c
+++ b/src/test/modules/test_ddl_deparse/test_ddl_deparse.c
@@ -162,9 +162,6 @@ get_altertable_subcmdtypes(PG_FUNCTION_ARGS)
case AT_ValidateConstraintRecurse:
strtype = "VALIDATE CONSTRAINT (and recurse)";
break;
- case AT_ProcessedConstraint:
- strtype = "ADD (processed) CONSTRAINT";
- break;
case AT_AddIndexConstraint:
strtype = "ADD CONSTRAINT (using index)";
break;
diff --git a/src/test/regress/expected/alter_table.out b/src/test/regress/expected/alter_table.out
index 5189fd8..615b48e 100644
--- a/src/test/regress/expected/alter_table.out
+++ b/src/test/regress/expected/alter_table.out
@@ -1958,27 +1958,29 @@ Indexes:
"anothertab_f4_idx" UNIQUE, btree (f4)
drop table anothertab;
-create table another (f1 int, f2 text);
-insert into another values(1, 'one');
-insert into another values(2, 'two');
-insert into another values(3, 'three');
+-- test that USING expressions are parsed before column alter type / drop steps
+create table another (f1 int, f2 text, f3 text);
+insert into another values(1, 'one', 'uno');
+insert into another values(2, 'two', 'due');
+insert into another values(3, 'three', 'tre');
select * from another;
- f1 | f2
-----+-------
- 1 | one
- 2 | two
- 3 | three
+ f1 | f2 | f3
+----+-------+-----
+ 1 | one | uno
+ 2 | two | due
+ 3 | three | tre
(3 rows)
alter table another
- alter f1 type text using f2 || ' more',
- alter f2 type bigint using f1 * 10;
+ alter f1 type text using f2 || ' and ' || f3 || ' more',
+ alter f2 type bigint using f1 * 10,
+ drop column f3;
select * from another;
- f1 | f2
-------------+----
- one more | 10
- two more | 20
- three more | 30
+ f1 | f2
+--------------------+----
+ one and uno more | 10
+ two and due more | 20
+ three and tre more | 30
(3 rows)
drop table another;
@@ -3473,7 +3475,7 @@ NOTICE: column "c2" of relation "test_add_column" already exists, skipping
ALTER TABLE test_add_column
ADD COLUMN c2 integer, -- fail because c2 already exists
- ADD COLUMN c3 integer;
+ ADD COLUMN c3 integer primary key;
ERROR: column "c2" of relation "test_add_column" already exists
\d test_add_column
Table "public.test_add_column"
@@ -3484,7 +3486,7 @@ ERROR: column "c2" of relation "test_add_column" already exists
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer, -- skipping because c2 already exists
- ADD COLUMN c3 integer; -- fail because c3 already exists
+ ADD COLUMN c3 integer primary key;
NOTICE: column "c2" of relation "test_add_column" already exists, skipping
\d test_add_column
Table "public.test_add_column"
@@ -3492,11 +3494,13 @@ NOTICE: column "c2" of relation "test_add_column" already exists, skipping
--------+---------+-----------+----------+---------
c1 | integer | | |
c2 | integer | | |
- c3 | integer | | |
+ c3 | integer | | not null |
+Indexes:
+ "test_add_column_pkey" PRIMARY KEY, btree (c3)
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer, -- skipping because c2 already exists
- ADD COLUMN IF NOT EXISTS c3 integer; -- skipping because c3 already exists
+ ADD COLUMN IF NOT EXISTS c3 integer primary key; -- skipping because c3 already exists
NOTICE: column "c2" of relation "test_add_column" already exists, skipping
NOTICE: column "c3" of relation "test_add_column" already exists, skipping
\d test_add_column
@@ -3505,12 +3509,14 @@ NOTICE: column "c3" of relation "test_add_column" already exists, skipping
--------+---------+-----------+----------+---------
c1 | integer | | |
c2 | integer | | |
- c3 | integer | | |
+ c3 | integer | | not null |
+Indexes:
+ "test_add_column_pkey" PRIMARY KEY, btree (c3)
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer, -- skipping because c2 already exists
ADD COLUMN IF NOT EXISTS c3 integer, -- skipping because c3 already exists
- ADD COLUMN c4 integer;
+ ADD COLUMN c4 integer REFERENCES test_add_column;
NOTICE: column "c2" of relation "test_add_column" already exists, skipping
NOTICE: column "c3" of relation "test_add_column" already exists, skipping
\d test_add_column
@@ -3519,10 +3525,84 @@ NOTICE: column "c3" of relation "test_add_column" already exists, skipping
--------+---------+-----------+----------+---------
c1 | integer | | |
c2 | integer | | |
- c3 | integer | | |
+ c3 | integer | | not null |
+ c4 | integer | | |
+Indexes:
+ "test_add_column_pkey" PRIMARY KEY, btree (c3)
+Foreign-key constraints:
+ "test_add_column_c4_fkey" FOREIGN KEY (c4) REFERENCES test_add_column(c3)
+Referenced by:
+ TABLE "test_add_column" CONSTRAINT "test_add_column_c4_fkey" FOREIGN KEY (c4) REFERENCES test_add_column(c3)
+
+ALTER TABLE test_add_column
+ ADD COLUMN IF NOT EXISTS c4 integer REFERENCES test_add_column;
+NOTICE: column "c4" of relation "test_add_column" already exists, skipping
+\d test_add_column
+ Table "public.test_add_column"
+ Column | Type | Collation | Nullable | Default
+--------+---------+-----------+----------+---------
+ c1 | integer | | |
+ c2 | integer | | |
+ c3 | integer | | not null |
+ c4 | integer | | |
+Indexes:
+ "test_add_column_pkey" PRIMARY KEY, btree (c3)
+Foreign-key constraints:
+ "test_add_column_c4_fkey" FOREIGN KEY (c4) REFERENCES test_add_column(c3)
+Referenced by:
+ TABLE "test_add_column" CONSTRAINT "test_add_column_c4_fkey" FOREIGN KEY (c4) REFERENCES test_add_column(c3)
+
+ALTER TABLE test_add_column
+ ADD COLUMN IF NOT EXISTS c5 SERIAL;
+\d test_add_column
+ Table "public.test_add_column"
+ Column | Type | Collation | Nullable | Default
+--------+---------+-----------+----------+---------------------------------------------
+ c1 | integer | | |
+ c2 | integer | | |
+ c3 | integer | | not null |
c4 | integer | | |
+ c5 | integer | | not null | nextval('test_add_column_c5_seq'::regclass)
+Indexes:
+ "test_add_column_pkey" PRIMARY KEY, btree (c3)
+Foreign-key constraints:
+ "test_add_column_c4_fkey" FOREIGN KEY (c4) REFERENCES test_add_column(c3)
+Referenced by:
+ TABLE "test_add_column" CONSTRAINT "test_add_column_c4_fkey" FOREIGN KEY (c4) REFERENCES test_add_column(c3)
+
+ALTER TABLE test_add_column
+ ADD COLUMN IF NOT EXISTS c5 SERIAL;
+NOTICE: column "c5" of relation "test_add_column" already exists, skipping
+\d test_add_column*
+ Table "public.test_add_column"
+ Column | Type | Collation | Nullable | Default
+--------+---------+-----------+----------+---------------------------------------------
+ c1 | integer | | |
+ c2 | integer | | |
+ c3 | integer | | not null |
+ c4 | integer | | |
+ c5 | integer | | not null | nextval('test_add_column_c5_seq'::regclass)
+Indexes:
+ "test_add_column_pkey" PRIMARY KEY, btree (c3)
+Foreign-key constraints:
+ "test_add_column_c4_fkey" FOREIGN KEY (c4) REFERENCES test_add_column(c3)
+Referenced by:
+ TABLE "test_add_column" CONSTRAINT "test_add_column_c4_fkey" FOREIGN KEY (c4) REFERENCES test_add_column(c3)
+
+ Sequence "public.test_add_column_c5_seq"
+ Type | Start | Minimum | Maximum | Increment | Cycles? | Cache
+---------+-------+---------+------------+-----------+---------+-------
+ integer | 1 | 1 | 2147483647 | 1 | no | 1
+Owned by: public.test_add_column.c5
+
+ Index "public.test_add_column_pkey"
+ Column | Type | Key? | Definition
+--------+---------+------+------------
+ c3 | integer | yes | c3
+primary key, btree, for table "public.test_add_column"
DROP TABLE test_add_column;
+\d test_add_column*
-- unsupported constraint types for partitioned tables
CREATE TABLE partitioned (
a int,
diff --git a/src/test/regress/expected/identity.out b/src/test/regress/expected/identity.out
index 36a2393..7cf4696 100644
--- a/src/test/regress/expected/identity.out
+++ b/src/test/regress/expected/identity.out
@@ -387,6 +387,68 @@ SELECT * FROM itest8;
RESET ROLE;
DROP TABLE itest8;
DROP USER regress_identity_user1;
+-- multiple steps in ALTER TABLE
+CREATE TABLE itest8 (f1 int);
+ALTER TABLE itest8
+ ADD COLUMN f2 int NOT NULL,
+ ALTER COLUMN f2 ADD GENERATED ALWAYS AS IDENTITY;
+ALTER TABLE itest8
+ ADD COLUMN f3 int NOT NULL,
+ ALTER COLUMN f3 ADD GENERATED ALWAYS AS IDENTITY,
+ ALTER COLUMN f3 SET GENERATED BY DEFAULT SET INCREMENT 10;
+ALTER TABLE itest8
+ ADD COLUMN f4 int;
+ALTER TABLE itest8
+ ALTER COLUMN f4 SET NOT NULL,
+ ALTER COLUMN f4 ADD GENERATED ALWAYS AS IDENTITY,
+ ALTER COLUMN f4 SET DATA TYPE bigint;
+ALTER TABLE itest8
+ ADD COLUMN f5 int GENERATED ALWAYS AS IDENTITY;
+ALTER TABLE itest8
+ ALTER COLUMN f5 DROP IDENTITY,
+ ALTER COLUMN f5 DROP NOT NULL,
+ ALTER COLUMN f5 SET DATA TYPE bigint;
+INSERT INTO itest8 VALUES(0), (1);
+TABLE itest8;
+ f1 | f2 | f3 | f4 | f5
+----+----+----+----+----
+ 0 | 1 | 1 | 1 |
+ 1 | 2 | 11 | 2 |
+(2 rows)
+
+\d+ itest8
+ Table "public.itest8"
+ Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
+--------+---------+-----------+----------+----------------------------------+---------+--------------+-------------
+ f1 | integer | | | | plain | |
+ f2 | integer | | not null | generated always as identity | plain | |
+ f3 | integer | | not null | generated by default as identity | plain | |
+ f4 | bigint | | not null | generated always as identity | plain | |
+ f5 | bigint | | | | plain | |
+
+\d itest8_f2_seq
+ Sequence "public.itest8_f2_seq"
+ Type | Start | Minimum | Maximum | Increment | Cycles? | Cache
+---------+-------+---------+------------+-----------+---------+-------
+ integer | 1 | 1 | 2147483647 | 1 | no | 1
+Sequence for identity column: public.itest8.f2
+
+\d itest8_f3_seq
+ Sequence "public.itest8_f3_seq"
+ Type | Start | Minimum | Maximum | Increment | Cycles? | Cache
+---------+-------+---------+------------+-----------+---------+-------
+ integer | 1 | 1 | 2147483647 | 10 | no | 1
+Sequence for identity column: public.itest8.f3
+
+\d itest8_f4_seq
+ Sequence "public.itest8_f4_seq"
+ Type | Start | Minimum | Maximum | Increment | Cycles? | Cache
+--------+-------+---------+---------------------+-----------+---------+-------
+ bigint | 1 | 1 | 9223372036854775807 | 1 | no | 1
+Sequence for identity column: public.itest8.f4
+
+\d itest8_f5_seq
+DROP TABLE itest8;
-- typed tables (currently not supported)
CREATE TYPE itest_type AS (f1 integer, f2 text, f3 bigint);
CREATE TABLE itest12 OF itest_type (f1 WITH OPTIONS GENERATED ALWAYS AS IDENTITY); -- error
diff --git a/src/test/regress/sql/alter_table.sql b/src/test/regress/sql/alter_table.sql
index 14d06c1..ea5afc9 100644
--- a/src/test/regress/sql/alter_table.sql
+++ b/src/test/regress/sql/alter_table.sql
@@ -1342,17 +1342,19 @@ alter table anothertab alter column f5 type bigint;
drop table anothertab;
-create table another (f1 int, f2 text);
+-- test that USING expressions are parsed before column alter type / drop steps
+create table another (f1 int, f2 text, f3 text);
-insert into another values(1, 'one');
-insert into another values(2, 'two');
-insert into another values(3, 'three');
+insert into another values(1, 'one', 'uno');
+insert into another values(2, 'two', 'due');
+insert into another values(3, 'three', 'tre');
select * from another;
alter table another
- alter f1 type text using f2 || ' more',
- alter f2 type bigint using f1 * 10;
+ alter f1 type text using f2 || ' and ' || f3 || ' more',
+ alter f2 type bigint using f1 * 10,
+ drop column f3;
select * from another;
@@ -2174,22 +2176,32 @@ ALTER TABLE ONLY test_add_column
\d test_add_column
ALTER TABLE test_add_column
ADD COLUMN c2 integer, -- fail because c2 already exists
- ADD COLUMN c3 integer;
+ ADD COLUMN c3 integer primary key;
\d test_add_column
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer, -- skipping because c2 already exists
- ADD COLUMN c3 integer; -- fail because c3 already exists
+ ADD COLUMN c3 integer primary key;
\d test_add_column
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer, -- skipping because c2 already exists
- ADD COLUMN IF NOT EXISTS c3 integer; -- skipping because c3 already exists
+ ADD COLUMN IF NOT EXISTS c3 integer primary key; -- skipping because c3 already exists
\d test_add_column
ALTER TABLE test_add_column
ADD COLUMN IF NOT EXISTS c2 integer, -- skipping because c2 already exists
ADD COLUMN IF NOT EXISTS c3 integer, -- skipping because c3 already exists
- ADD COLUMN c4 integer;
+ ADD COLUMN c4 integer REFERENCES test_add_column;
\d test_add_column
+ALTER TABLE test_add_column
+ ADD COLUMN IF NOT EXISTS c4 integer REFERENCES test_add_column;
+\d test_add_column
+ALTER TABLE test_add_column
+ ADD COLUMN IF NOT EXISTS c5 SERIAL;
+\d test_add_column
+ALTER TABLE test_add_column
+ ADD COLUMN IF NOT EXISTS c5 SERIAL;
+\d test_add_column*
DROP TABLE test_add_column;
+\d test_add_column*
-- unsupported constraint types for partitioned tables
CREATE TABLE partitioned (
diff --git a/src/test/regress/sql/identity.sql b/src/test/regress/sql/identity.sql
index 4b03d24..685607c 100644
--- a/src/test/regress/sql/identity.sql
+++ b/src/test/regress/sql/identity.sql
@@ -239,6 +239,44 @@ RESET ROLE;
DROP TABLE itest8;
DROP USER regress_identity_user1;
+-- multiple steps in ALTER TABLE
+CREATE TABLE itest8 (f1 int);
+
+ALTER TABLE itest8
+ ADD COLUMN f2 int NOT NULL,
+ ALTER COLUMN f2 ADD GENERATED ALWAYS AS IDENTITY;
+
+ALTER TABLE itest8
+ ADD COLUMN f3 int NOT NULL,
+ ALTER COLUMN f3 ADD GENERATED ALWAYS AS IDENTITY,
+ ALTER COLUMN f3 SET GENERATED BY DEFAULT SET INCREMENT 10;
+
+ALTER TABLE itest8
+ ADD COLUMN f4 int;
+
+ALTER TABLE itest8
+ ALTER COLUMN f4 SET NOT NULL,
+ ALTER COLUMN f4 ADD GENERATED ALWAYS AS IDENTITY,
+ ALTER COLUMN f4 SET DATA TYPE bigint;
+
+ALTER TABLE itest8
+ ADD COLUMN f5 int GENERATED ALWAYS AS IDENTITY;
+
+ALTER TABLE itest8
+ ALTER COLUMN f5 DROP IDENTITY,
+ ALTER COLUMN f5 DROP NOT NULL,
+ ALTER COLUMN f5 SET DATA TYPE bigint;
+
+INSERT INTO itest8 VALUES(0), (1);
+
+TABLE itest8;
+\d+ itest8
+\d itest8_f2_seq
+\d itest8_f3_seq
+\d itest8_f4_seq
+\d itest8_f5_seq
+DROP TABLE itest8;
+
-- typed tables (currently not supported)
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