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Move TupleTableSlots boolean member into one flag variable.

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There's several reasons for this change:
1) It reduces the total size of TupleTableSlot / reduces alignment
   padding, making the commonly accessed members fit into a single
   cacheline (but we currently do not force proper alignment, so
   that's not yet guaranteed to be helpful)
2) Combining the booleans into a flag allows to combine read/writes
   from memory.
3) With the upcoming slot abstraction changes, it allows to have core
   and extended flags, in a memory efficient way.

Author: Ashutosh Bapat and Andres Freund
Discussion: https://postgr.es/m/20180220224318.gw4oe5jadhpmcdnm@alap3.anarazel.de
This commit is contained in:
Andres Freund
2018-10-15 15:24:33 -07:00
parent 9d906f1119
commit c5257345ef
8 changed files with 116 additions and 72 deletions
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2
src/include/executor/executor.h
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@ -340,7 +340,7 @@ ExecProject(ProjectionInfo *projInfo)
* Successfully formed a result row. Mark the result slot as containing a
* valid virtual tuple (inlined version of ExecStoreVirtualTuple()).
*/
slot->tts_isempty = false;
slot->tts_flags &= ~TTS_FLAG_EMPTY;
slot->tts_nvalid = slot->tts_tupleDescriptor->natts;
return slot;