Thread: pgsql: Add ExecStorePinnedBufferHeapTuple.

Add ExecStorePinnedBufferHeapTuple.

This allows to avoid an unnecessary pin/unpin cycle when storing a
tuple in an already pinned buffer into a slot, when the pin isn't
further needed at the call site.

Only a single caller for now (to ensure coverage), but upcoming
patches will increase use of the new function.

Author: Andres Freund
Discussion: https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/8aa02b52db11039925191912eca71e3584b68860

Modified Files
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src/backend/executor/execTuples.c  | 59 +++++++++++++++++++++++++++++++++-----
src/backend/executor/nodeTidscan.c | 17 ++++-------
src/include/executor/tuptable.h    |  3 ++
3 files changed, 60 insertions(+), 19 deletions(-)