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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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4
src/backend/executor/execMain.c
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@ -787,11 +787,11 @@ ExecCheckXactReadOnly(PlannedStmt *plannedstmt)
if (isTempNamespace(get_rel_namespace(rte->relid)))
continue;
PreventCommandIfReadOnly(CreateCommandTag((Node *) plannedstmt));
PreventCommandIfReadOnly(CreateCommandName((Node *) plannedstmt));
}
if (plannedstmt->commandType != CMD_SELECT || plannedstmt->hasModifyingCTE)
PreventCommandIfParallelMode(CreateCommandTag((Node *) plannedstmt));
PreventCommandIfParallelMode(CreateCommandName((Node *) plannedstmt));
}