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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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20
contrib/pg_stat_statements/pg_stat_statements.c
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@ -307,7 +307,7 @@ static void pgss_ExecutorEnd(QueryDesc *queryDesc);
static void pgss_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
ProcessUtilityContext context, ParamListInfo params,
QueryEnvironment *queryEnv,
DestReceiver *dest, char *completionTag);
DestReceiver *dest, QueryCompletion *qc);
static uint64 pgss_hash_string(const char *str, int len);
static void pgss_store(const char *query, uint64 queryId,
int query_location, int query_len,
@ -960,7 +960,7 @@ static void
pgss_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
ProcessUtilityContext context,
ParamListInfo params, QueryEnvironment *queryEnv,
DestReceiver *dest, char *completionTag)
DestReceiver *dest, QueryCompletion *qc)
{
Node *parsetree = pstmt->utilityStmt;
@ -998,11 +998,11 @@ pgss_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
if (prev_ProcessUtility)
prev_ProcessUtility(pstmt, queryString,
context, params, queryEnv,
dest, completionTag);
dest, qc);
else
standard_ProcessUtility(pstmt, queryString,
context, params, queryEnv,
dest, completionTag);
dest, qc);
}
PG_FINALLY();
{
@ -1013,12 +1013,8 @@ pgss_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
INSTR_TIME_SET_CURRENT(duration);
INSTR_TIME_SUBTRACT(duration, start);
/* parse command tag to retrieve the number of affected rows. */
if (completionTag &&
strncmp(completionTag, "COPY ", 5) == 0)
rows = pg_strtouint64(completionTag + 5, NULL, 10);
else
rows = 0;
if (qc)
rows = qc->commandTag == CMDTAG_COPY ? qc->nprocessed : 0;
/* calc differences of buffer counters. */
bufusage.shared_blks_hit =
@ -1060,11 +1056,11 @@ pgss_ProcessUtility(PlannedStmt *pstmt, const char *queryString,
if (prev_ProcessUtility)
prev_ProcessUtility(pstmt, queryString,
context, params, queryEnv,
dest, completionTag);
dest, qc);
else
standard_ProcessUtility(pstmt, queryString,
context, params, queryEnv,
dest, completionTag);
dest, qc);
}
}