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Represent command completion tags as structs

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The backend was using strings to represent command tags and doing string
comparisons in multiple places, but that's slow and unhelpful.  Create a
new command list with a supporting structure to use instead; this is
stored in a tag-list-file that can be tailored to specific purposes with
a caller-definable C macro, similar to what we do for WAL resource
managers.  The first first such uses are a new CommandTag enum and a
CommandTagBehavior struct.

Replace numerous occurrences of char *completionTag with a
QueryCompletion struct so that the code no longer stores information
about completed queries in a cstring.  Only at the last moment, in
EndCommand(), does this get converted to a string.

EventTriggerCacheItem no longer holds an array of palloc’d tag strings
in sorted order, but rather just a Bitmapset over the CommandTags.

Author: Mark Dilger, with unsolicited help from Álvaro Herrera
Reviewed-by: John Naylor, Tom Lane
Discussion: https://postgr.es/m/981A9DB4-3F0C-4DA5-88AD-CB9CFF4D6CAD@enterprisedb.com
This commit is contained in:
Alvaro Herrera
2020-03-02 18:19:51 -03:00
parent 7b425a5283
commit 2f9661311b
39 changed files with 877 additions and 621 deletions
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8
src/backend/utils/cache/plancache.c vendored
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@@ -158,12 +158,12 @@ InitPlanCache(void)
*
* raw_parse_tree: output of raw_parser(), or NULL if empty query
* query_string: original query text
* commandTag: compile-time-constant tag for query, or NULL if empty query
* commandTag: command tag for query, or UNKNOWN if empty query
*/
CachedPlanSource *
CreateCachedPlan(RawStmt *raw_parse_tree,
const char *query_string,
const char *commandTag)
CommandTag commandTag)
{
CachedPlanSource *plansource;
MemoryContext source_context;
@@ -241,12 +241,12 @@ CreateCachedPlan(RawStmt *raw_parse_tree,
*
* raw_parse_tree: output of raw_parser(), or NULL if empty query
* query_string: original query text
* commandTag: compile-time-constant tag for query, or NULL if empty query
* commandTag: command tag for query, or NULL if empty query
*/
CachedPlanSource *
CreateOneShotCachedPlan(RawStmt *raw_parse_tree,
const char *query_string,
const char *commandTag)
CommandTag commandTag)
{
CachedPlanSource *plansource;