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Move pg_stat_statements query jumbling to core.

Browse Source 
Add compute_query_id GUC to control whether a query identifier should be
computed by the core (off by default).  It's thefore now possible to
disable core queryid computation and use pg_stat_statements with a
different algorithm to compute the query identifier by using a
third-party module.

To ensure that a single source of query identifier can be used and is
well defined, modules that calculate a query identifier should throw an
error if compute_query_id specified to compute a query id and if a query
idenfitier was already calculated.

Discussion: https://postgr.es/m/20210407125726.tkvjdbw76hxnpwfi@nol

Author: Julien Rouhaud

Reviewed-by: Alvaro Herrera, Nitin Jadhav, Zhihong Yu
This commit is contained in:
Bruce Momjian
2021-04-07 13:06:47 -04:00
parent a282ee68a0
commit 5fd9dfa5f5
13 changed files with 995 additions and 785 deletions
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14
src/backend/parser/analyze.c
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@@ -46,6 +46,8 @@
#include "parser/parsetree.h"
#include "rewrite/rewriteManip.h"
#include "utils/builtins.h"
#include "utils/guc.h"
#include "utils/queryjumble.h"
#include "utils/rel.h"
@@ -107,6 +109,7 @@ parse_analyze(RawStmt *parseTree, const char *sourceText,
{
ParseState *pstate = make_parsestate(NULL);
Query *query;
JumbleState *jstate = NULL;
Assert(sourceText != NULL); /* required as of 8.4 */
@@ -119,8 +122,11 @@ parse_analyze(RawStmt *parseTree, const char *sourceText,
query = transformTopLevelStmt(pstate, parseTree);
if (compute_query_id)
jstate = JumbleQuery(query, sourceText);
if (post_parse_analyze_hook)
(*post_parse_analyze_hook) (pstate, query);
(*post_parse_analyze_hook) (pstate, query, jstate);
free_parsestate(pstate);
@@ -140,6 +146,7 @@ parse_analyze_varparams(RawStmt *parseTree, const char *sourceText,
{
ParseState *pstate = make_parsestate(NULL);
Query *query;
JumbleState *jstate = NULL;
Assert(sourceText != NULL); /* required as of 8.4 */
@@ -152,8 +159,11 @@ parse_analyze_varparams(RawStmt *parseTree, const char *sourceText,
/* make sure all is well with parameter types */
check_variable_parameters(pstate, query);
if (compute_query_id)
jstate = JumbleQuery(query, sourceText);
if (post_parse_analyze_hook)
(*post_parse_analyze_hook) (pstate, query);
(*post_parse_analyze_hook) (pstate, query, jstate);
free_parsestate(pstate);