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Check for interrupts in pg_trgm word similarity

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Calculating similarity between large strings can be timesconsuming
and overrun configured statement timeouts. Check for interrupts in
the main loop to ensure query cancellation can be performed.

Author: Robins Tharakan <tharakan@gmail.com>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CAEP4nAxvmfc_XWTz73bqXRhgjONi=1HaX4_NhsopA3L6UvnN1g@mail.gmail.com
This commit is contained in:
Daniel Gustafsson 2022-09-05 11:10:57 +02:00
parent 519be095f2
commit ae4fc52ae2
1 changed files with 6 additions and 1 deletions
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7
contrib/pg_trgm/trgm_op.c
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@ -7,6 +7,7 @@
#include "catalog/pg_type.h"
#include "lib/qunique.h"
#include "miscadmin.h"
#include "trgm.h"
#include "tsearch/ts_locale.h"
#include "utils/lsyscache.h"
@ -492,8 +493,12 @@ iterate_word_similarity(int *trg2indexes,
for (i = 0; i < len2; i++)
{
int trgindex;
CHECK_FOR_INTERRUPTS();
/* Get index of next trigram */
int trgindex = trg2indexes[i];
trgindex = trg2indexes[i];
/* Update last position of this trigram */
if (lower >= 0 || found[trgindex])