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Add API of sorts for transition table handling in trigger.c

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Preparatory patch for further additions in this area, particularly to
allow MERGE to have separate transition tables for each action.

Author: Pavan Deolasee <pavan.deolasee@gmail.com>
Reviewed-by: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/CABOikdNj+8HEJ5D8tu56mrPkjHVRrBb2_cdKWwpiYNcjXgDw8g@mail.gmail.com
Discussion: https://postgr.es/m/20201231134736.GA25392@alvherre.pgsql
pull/81/head
Alvaro Herrera 4 years ago
parent 641f3dffcd
commit 3a46a45f6f
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1 changed files with 119 additions and 53 deletions
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  1. 172
      src/backend/commands/trigger.c

172
src/backend/commands/trigger.c
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@ -3772,6 +3772,16 @@ static AfterTriggersTableData *GetAfterTriggersTableData(Oid relid,
CmdType cmdType);
static TupleTableSlot *GetAfterTriggersStoreSlot(AfterTriggersTableData *table,
TupleDesc tupdesc);
static Tuplestorestate *GetAfterTriggersTransitionTable(int event,
TupleTableSlot *oldslot,
TupleTableSlot *newslot,
TransitionCaptureState *transition_capture);
static void TransitionTableAddTuple(EState *estate,
TransitionCaptureState *transition_capture,
ResultRelInfo *relinfo,
TupleTableSlot *slot,
TupleTableSlot *original_insert_tuple,
Tuplestorestate *tuplestore);
static void AfterTriggerFreeQuery(AfterTriggersQueryData *qs);
static SetConstraintState SetConstraintStateCreate(int numalloc);
static SetConstraintState SetConstraintStateCopy(SetConstraintState state);
@ -5158,6 +5168,92 @@ AfterTriggerEndSubXact(bool isCommit)
}
}
/*
* Get the transition table for the given event and depending on whether we are
* processing the old or the new tuple.
*/
static Tuplestorestate *
GetAfterTriggersTransitionTable(int event,
TupleTableSlot *oldslot,
TupleTableSlot *newslot,
TransitionCaptureState *transition_capture)
{
Tuplestorestate *tuplestore = NULL;
bool delete_old_table = transition_capture->tcs_delete_old_table;
bool update_old_table = transition_capture->tcs_update_old_table;
bool update_new_table = transition_capture->tcs_update_new_table;
bool insert_new_table = transition_capture->tcs_insert_new_table;
/*
* For INSERT events NEW should be non-NULL, for DELETE events OLD should
* be non-NULL, whereas for UPDATE events normally both OLD and NEW are
* non-NULL. But for UPDATE events fired for capturing transition tuples
* during UPDATE partition-key row movement, OLD is NULL when the event is
* for a row being inserted, whereas NEW is NULL when the event is for a
* row being deleted.
*/
Assert(!(event == TRIGGER_EVENT_DELETE && delete_old_table &&
TupIsNull(oldslot)));
Assert(!(event == TRIGGER_EVENT_INSERT && insert_new_table &&
TupIsNull(newslot)));
if (!TupIsNull(oldslot))
{
Assert(TupIsNull(newslot));
if (event == TRIGGER_EVENT_DELETE && delete_old_table)
tuplestore = transition_capture->tcs_private->old_tuplestore;
else if (event == TRIGGER_EVENT_UPDATE && update_old_table)
tuplestore = transition_capture->tcs_private->old_tuplestore;
}
else if (!TupIsNull(newslot))
{
Assert(TupIsNull(oldslot));
if (event == TRIGGER_EVENT_INSERT && insert_new_table)
tuplestore = transition_capture->tcs_private->new_tuplestore;
else if (event == TRIGGER_EVENT_UPDATE && update_new_table)
tuplestore = transition_capture->tcs_private->new_tuplestore;
}
return tuplestore;
}
/*
* Add the given heap tuple to the given tuplestore, applying the conversion
* map if necessary.
*
* If original_insert_tuple is given, we can add that tuple without conversion.
*/
static void
TransitionTableAddTuple(EState *estate,
TransitionCaptureState *transition_capture,
ResultRelInfo *relinfo,
TupleTableSlot *slot,
TupleTableSlot *original_insert_tuple,
Tuplestorestate *tuplestore)
{
TupleConversionMap *map;
/*
* Nothing needs to be done if we don't have a tuplestore.
*/
if (tuplestore == NULL)
return;
if (original_insert_tuple)
tuplestore_puttupleslot(tuplestore, original_insert_tuple);
else if ((map = ExecGetChildToRootMap(relinfo)) != NULL)
{
AfterTriggersTableData *table = transition_capture->tcs_private;
TupleTableSlot *storeslot;
storeslot = GetAfterTriggersStoreSlot(table, map->outdesc);
execute_attr_map_slot(map->attrMap, slot, storeslot);
tuplestore_puttupleslot(tuplestore, storeslot);
}
else
tuplestore_puttupleslot(tuplestore, slot);
}
/* ----------
* AfterTriggerEnlargeQueryState()
*
@ -5650,7 +5746,6 @@ AfterTriggerPendingOnRel(Oid relid)
return false;
}
/* ----------
* AfterTriggerSaveEvent()
*
@ -5709,68 +5804,39 @@ AfterTriggerSaveEvent(EState *estate, ResultRelInfo *relinfo,
*/
if (row_trigger && transition_capture != NULL)
{
TupleTableSlot *original_insert_tuple = transition_capture->tcs_original_insert_tuple;
TupleConversionMap *map = ExecGetChildToRootMap(relinfo);
bool delete_old_table = transition_capture->tcs_delete_old_table;
bool update_old_table = transition_capture->tcs_update_old_table;
bool update_new_table = transition_capture->tcs_update_new_table;
bool insert_new_table = transition_capture->tcs_insert_new_table;
/*
* For INSERT events NEW should be non-NULL, for DELETE events OLD
* should be non-NULL, whereas for UPDATE events normally both OLD and
* NEW are non-NULL. But for UPDATE events fired for capturing
* transition tuples during UPDATE partition-key row movement, OLD is
* NULL when the event is for a row being inserted, whereas NEW is
* NULL when the event is for a row being deleted.
* Capture the old tuple in the appropriate transition table based on
* the event.
*/
Assert(!(event == TRIGGER_EVENT_DELETE && delete_old_table &&
TupIsNull(oldslot)));
Assert(!(event == TRIGGER_EVENT_INSERT && insert_new_table &&
TupIsNull(newslot)));
if (!TupIsNull(oldslot) &&
((event == TRIGGER_EVENT_DELETE && delete_old_table) ||
(event == TRIGGER_EVENT_UPDATE && update_old_table)))
if (!TupIsNull(oldslot))
{
Tuplestorestate *old_tuplestore;
old_tuplestore = transition_capture->tcs_private->old_tuplestore;
if (map != NULL)
{
AfterTriggersTableData *table = transition_capture->tcs_private;
TupleTableSlot *storeslot;
storeslot = GetAfterTriggersStoreSlot(table, map->outdesc);
execute_attr_map_slot(map->attrMap, oldslot, storeslot);
tuplestore_puttupleslot(old_tuplestore, storeslot);
}
else
tuplestore_puttupleslot(old_tuplestore, oldslot);
old_tuplestore = GetAfterTriggersTransitionTable(event,
oldslot,
NULL,
transition_capture);
TransitionTableAddTuple(estate, transition_capture, relinfo,
oldslot, NULL, old_tuplestore);
}
if (!TupIsNull(newslot) &&
((event == TRIGGER_EVENT_INSERT && insert_new_table) ||
(event == TRIGGER_EVENT_UPDATE && update_new_table)))
{
Tuplestorestate *new_tuplestore;
new_tuplestore = transition_capture->tcs_private->new_tuplestore;
if (original_insert_tuple != NULL)
tuplestore_puttupleslot(new_tuplestore,
original_insert_tuple);
else if (map != NULL)
/*
* Capture the new tuple in the appropriate transition table based on
* the event.
*/
if (!TupIsNull(newslot))
{
AfterTriggersTableData *table = transition_capture->tcs_private;
TupleTableSlot *storeslot;
Tuplestorestate *new_tuplestore;
storeslot = GetAfterTriggersStoreSlot(table, map->outdesc);
execute_attr_map_slot(map->attrMap, newslot, storeslot);
tuplestore_puttupleslot(new_tuplestore, storeslot);
}
else
tuplestore_puttupleslot(new_tuplestore, newslot);
new_tuplestore = GetAfterTriggersTransitionTable(event,
NULL,
newslot,
transition_capture);
TransitionTableAddTuple(estate, transition_capture, relinfo,
newslot,
transition_capture->tcs_original_insert_tuple,
new_tuplestore);
}
/*

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