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Allow aggregate transition states to be serialized and deserialized.

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This is necessary infrastructure for supporting parallel aggregation
for aggregates whose transition type is "internal".  Such values
can't be passed between cooperating processes, because they are
just pointers.

David Rowley, reviewed by Tomas Vondra and by me.
This commit is contained in:
Robert Haas
2016-03-29 15:04:05 -04:00
parent 7f0a2c85fb
commit 5fe5a2cee9
25 changed files with 794 additions and 193 deletions
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8
src/backend/optimizer/plan/setrefs.c
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@ -2057,10 +2057,10 @@ search_indexed_tlist_for_sortgroupref(Node *node,
* search_indexed_tlist_for_partial_aggref - find an Aggref in an indexed tlist
*
* Aggrefs for partial aggregates have their aggoutputtype adjusted to set it
* to the aggregate state's type. This means that a standard equal() comparison
* won't match when comparing an Aggref which is in partial mode with an Aggref
* which is not. Here we manually compare all of the fields apart from
* aggoutputtype.
* to the aggregate state's type, or serialization type. This means that a
* standard equal() comparison won't match when comparing an Aggref which is
* in partial mode with an Aggref which is not. Here we manually compare all of
* the fields apart from aggoutputtype.
*/
static Var *
search_indexed_tlist_for_partial_aggref(Aggref *aggref, indexed_tlist *itlist,