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Move pg_stat_statements query jumbling to core.

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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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10
src/backend/utils/misc/guc.c
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@@ -534,6 +534,7 @@ extern const struct config_enum_entry dynamic_shared_memory_options[];
/*
* GUC option variables that are exported from this module
*/
bool compute_query_id = false;
bool log_duration = false;
bool Debug_print_plan = false;
bool Debug_print_parse = false;
@@ -1458,6 +1459,15 @@ static struct config_bool ConfigureNamesBool[] =
true,
NULL, NULL, NULL
},
{
{"compute_query_id", PGC_SUSET, STATS_MONITORING,
gettext_noop("Compute query identifiers."),
NULL
},
&compute_query_id,
false,
NULL, NULL, NULL
},
{
{"log_parser_stats", PGC_SUSET, STATS_MONITORING,
gettext_noop("Writes parser performance statistics to the server log."),