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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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7
src/include/utils/plancache.h
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@@ -18,6 +18,7 @@
#include "access/tupdesc.h"
#include "lib/ilist.h"
#include "nodes/params.h"
#include "tcop/cmdtag.h"
#include "utils/queryenvironment.h"
/* Forward declaration, to avoid including parsenodes.h here */
@@ -95,7 +96,7 @@ typedef struct CachedPlanSource
int magic; /* should equal CACHEDPLANSOURCE_MAGIC */
struct RawStmt *raw_parse_tree; /* output of raw_parser(), or NULL */
const char *query_string; /* source text of query */
const char *commandTag; /* command tag (a constant!), or NULL */
CommandTag commandTag; /* 'nuff said */
Oid *param_types; /* array of parameter type OIDs, or NULL */
int num_params; /* length of param_types array */
ParserSetupHook parserSetup; /* alternative parameter spec method */
@@ -186,10 +187,10 @@ extern void ResetPlanCache(void);
extern CachedPlanSource *CreateCachedPlan(struct RawStmt *raw_parse_tree,
const char *query_string,
const char *commandTag);
CommandTag commandTag);
extern CachedPlanSource *CreateOneShotCachedPlan(struct RawStmt *raw_parse_tree,
const char *query_string,
const char *commandTag);
CommandTag commandTag);
extern void CompleteCachedPlan(CachedPlanSource *plansource,
List *querytree_list,
MemoryContext querytree_context,