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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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src/include/utils/guc_tables.h
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@@ -267,5 +267,6 @@ extern void build_guc_variables(void);
extern const char *config_enum_lookup_by_value(struct config_enum *record, int val);
extern bool config_enum_lookup_by_name(struct config_enum *record,
const char *value, int *retval);
extern struct config_generic **get_explain_guc_options(int *num);
#endif /* GUC_TABLES_H */