pgsql: Pass ItemPointer not HeapTuple to IndexBuildCallback.

Pass ItemPointer not HeapTuple to IndexBuildCallback.

Not all AMs use HeapTuples internally, making it inconvenient to pass
a HeapTuple. As the index callbacks really only need the TID, not the
full tuple, modify callback to only take ItemPointer.

Author: Ashwin Agrawal
Reviewed-By: Andres Freund
Discussion: https://postgr.es/m/CALfoeis6=8ehuR=VNtHvj3z16cYfCwPdTcpaxU+sfSUJ5QgR3g@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/aae50236e4ce95c05a3962be0814c74c5a22206d

Modified Files
--------------
contrib/amcheck/verify_nbtree.c | 6 +++---
contrib/bloom/blinsert.c | 4 ++--
src/backend/access/brin/brin.c | 4 ++--
src/backend/access/gin/gininsert.c | 5 ++---
src/backend/access/gist/gistbuild.c | 6 +++---
src/backend/access/hash/hash.c | 9 ++++-----
src/backend/access/heap/heapam_handler.c | 13 ++++++-------
src/backend/access/nbtree/nbtsort.c | 8 ++++----
src/backend/access/spgist/spginsert.c | 4 ++--
src/include/access/tableam.h | 2 +-
10 files changed, 29 insertions(+), 32 deletions(-)