pgsql: Support for custom slots in the custom executor nodes

Support for custom slots in the custom executor nodes

Some custom table access method may have their tuple format and use custom
executor nodes for their custom scan types. The ability to set a custom slot
would save them from tuple format conversion. Other users of custom executor
nodes may also benefit.

Discussion: https://postgr.es/m/CAPpHfduJUU6ToecvTyRE_yjxTS80FyPpct4OHaLFk3OEheMTNA@mail.gmail.com
Author: Alexander Korotkov
Reviewed-by: Pavel Borisov

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/cee120951427fe39a54ab800abfa2834d85b8771

Modified Files
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src/backend/executor/nodeCustom.c | 13 +++++++++++--
src/include/nodes/execnodes.h     |  1 +
2 files changed, 12 insertions(+), 2 deletions(-)