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Add SETTINGS option to EXPLAIN, to print modified settings.

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Query planning is affected by a number of configuration options, and it
may be crucial to know which of those options were set to non-default
values.  With this patch you can say EXPLAIN (SETTINGS ON) to include
that information in the query plan.  Only options affecting planning,
with values different from the built-in default are printed.

This patch also adds auto_explain.log_settings option, providing the
same capability in auto_explain module.

Author: Tomas Vondra
Reviewed-by: Rafia Sabih, John Naylor
Discussion: https://postgr.es/m/e1791b4c-df9c-be02-edc5-7c8874944be0@2ndquadrant.com
This commit is contained in:
Tomas Vondra
2019-04-04 00:04:31 +02:00
parent d1f04b96b9
commit ea569d64ac
8 changed files with 333 additions and 52 deletions
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13
contrib/auto_explain/auto_explain.c
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@ -28,6 +28,7 @@ static bool auto_explain_log_verbose = false;
static bool auto_explain_log_buffers = false;
static bool auto_explain_log_triggers = false;
static bool auto_explain_log_timing = true;
static bool auto_explain_log_settings = false;
static int auto_explain_log_format = EXPLAIN_FORMAT_TEXT;
static int auto_explain_log_level = LOG;
static bool auto_explain_log_nested_statements = false;
@ -112,6 +113,17 @@ _PG_init(void)
NULL,
NULL);
DefineCustomBoolVariable("auto_explain.log_settings",
"Log modified configuration parameters affecting query planning.",
NULL,
&auto_explain_log_settings,
false,
PGC_SUSET,
0,
NULL,
NULL,
NULL);
DefineCustomBoolVariable("auto_explain.log_verbose",
"Use EXPLAIN VERBOSE for plan logging.",
NULL,
@ -356,6 +368,7 @@ explain_ExecutorEnd(QueryDesc *queryDesc)
es->timing = (es->analyze && auto_explain_log_timing);
es->summary = es->analyze;
es->format = auto_explain_log_format;
es->settings = auto_explain_log_settings;
ExplainBeginOutput(es);
ExplainQueryText(es, queryDesc);