CVSROOT: /cvsroot
Module name: pgsql-server
Changes by: tgl@svr1.postgresql.org 03/09/28 20:37:45
Modified files:
src/pl/plpgsql/src: pl_exec.c pl_handler.c plpgsql.h
Log message:
Restructure plpgsql's caching of 'simple' expression evaluation trees
to be less dangerous, and often faster as well. ExprState trees are
not kept across transaction boundaries; this eliminates problems with
resource leakage in failed transactions. But by keeping them in a
per-transaction EState, we can safely arrange for a single ExprState
to be shared by all the expression evaluations done in a given plpgsql
function call. (Formerly it seemed necessary to create and destroy an
ExprState for each exec_eval_simple_expr() call.) This saves time in
any scenario where a plpgsql function executes more than one expression.
Seems to be about as fast as 7.3 for simple cases, and significantly
faster for functions that do a lot of calculations.
