Re: simplifying foreign key/RI checks - Mailing list pgsql-hackers

From Amit Langote
Subject Re: simplifying foreign key/RI checks
Date
Msg-id CA+HiwqG1qQuBwApueaUfA855UJ4TiSgFkPF34hQDWx3tOChV5w@mail.gmail.com
Whole thread Raw
In response to Re: simplifying foreign key/RI checks  (Corey Huinker <corey.huinker@gmail.com>)
Responses Re: simplifying foreign key/RI checks  (Corey Huinker <corey.huinker@gmail.com>)
List pgsql-hackers
On Sun, Jan 24, 2021 at 11:26 AM Corey Huinker <corey.huinker@gmail.com> wrote:
> On Sat, Jan 23, 2021 at 12:52 PM Zhihong Yu <zyu@yugabyte.com> wrote:
>>
>> Hi,

Thanks for the review.

>> +       for (i = 0; i < riinfo->nkeys; i++)
>> +       {
>> +           Oid     eq_opr = eq_oprs[i];
>> +           Oid     typeid = RIAttType(fk_rel, riinfo->fk_attnums[i]);
>> +           RI_CompareHashEntry *entry = ri_HashCompareOp(eq_opr, typeid);
>> +
>> +           if (pk_nulls[i] != 'n' && OidIsValid(entry->cast_func_finfo.fn_oid))
>>
>> It seems the pk_nulls[i] != 'n' check can be lifted ahead of the assignment to the three local variables. That way,
ri_HashCompareOpwouldn't be called when pk_nulls[i] == 'n'.
 

Good idea, so done.  Although, there can't be nulls right now.

>> +           case TM_Updated:
>> +               if (IsolationUsesXactSnapshot())
>> ...
>> +           case TM_Deleted:
>> +               if (IsolationUsesXactSnapshot())
>>
>> It seems the handling for TM_Updated and TM_Deleted is the same. The cases for these two values can be put next to
eachother (saving one block of code).
 

Ah, yes.  The TM_Updated case used to be handled a bit differently in
earlier unposted versions of the patch, though at some point I
concluded that the special handling was unnecessary, but didn't
realize what you just pointed out.  Fixed.

> I'll pause on reviewing v4 until you've addressed the suggestions above.

Here's v5.

-- 
Amit Langote
EDB: http://www.enterprisedb.com

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