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Add tg_updatedcols to TriggerData

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This allows a trigger function to determine for an UPDATE trigger
which columns were actually updated.  This allows some optimizations
in generic trigger functions such as lo_manage and
tsvector_update_trigger.

Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://www.postgresql.org/message-id/flat/11c5f156-67a9-0fb5-8200-2a8018eb2e0c@2ndquadrant.com
This commit is contained in:
Peter Eisentraut
2020-03-09 09:22:22 +01:00
parent 8f152b6c50
commit 71d60e2aa0
7 changed files with 68 additions and 9 deletions
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6
src/backend/commands/trigger.c
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@ -2591,6 +2591,7 @@ ExecBSUpdateTriggers(EState *estate, ResultRelInfo *relinfo)
LocTriggerData.tg_event = TRIGGER_EVENT_UPDATE |
TRIGGER_EVENT_BEFORE;
LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
LocTriggerData.tg_updatedcols = updatedCols;
for (i = 0; i < trigdesc->numtriggers; i++)
{
Trigger *trigger = &trigdesc->triggers[i];
@ -2699,6 +2700,7 @@ ExecBRUpdateTriggers(EState *estate, EPQState *epqstate,
TRIGGER_EVENT_BEFORE;
LocTriggerData.tg_relation = relinfo->ri_RelationDesc;
updatedCols = GetAllUpdatedColumns(relinfo, estate);
LocTriggerData.tg_updatedcols = updatedCols;
for (i = 0; i < trigdesc->numtriggers; i++)
{
Trigger *trigger = &trigdesc->triggers[i];
@ -3255,6 +3257,7 @@ typedef struct AfterTriggerSharedData
Oid ats_relid; /* the relation it's on */
CommandId ats_firing_id; /* ID for firing cycle */
struct AfterTriggersTableData *ats_table; /* transition table access */
Bitmapset *ats_modifiedcols; /* modified columns */
} AfterTriggerSharedData;
typedef struct AfterTriggerEventData *AfterTriggerEvent;
@ -3954,6 +3957,8 @@ AfterTriggerExecute(EState *estate,
LocTriggerData.tg_event =
evtshared->ats_event & (TRIGGER_EVENT_OPMASK | TRIGGER_EVENT_ROW);
LocTriggerData.tg_relation = rel;
if (TRIGGER_FOR_UPDATE(LocTriggerData.tg_trigger->tgtype))
LocTriggerData.tg_updatedcols = evtshared->ats_modifiedcols;
MemoryContextReset(per_tuple_context);
@ -5641,6 +5646,7 @@ AfterTriggerSaveEvent(EState *estate, ResultRelInfo *relinfo,
new_shared.ats_table = transition_capture->tcs_private;
else
new_shared.ats_table = NULL;
new_shared.ats_modifiedcols = modifiedCols;
afterTriggerAddEvent(&afterTriggers.query_stack[afterTriggers.query_depth].events,
&new_event, &new_shared);