Bharathy b38c920266 MERGE support on hypertables
This patch does following:

1. Planner changes to create ChunkDispatch node when MERGE command
   has INSERT action.
2. Changes to map partition attributes from a tuple returned from
   child node of ChunkDispatch against physical targetlist, so that
   ChunkDispatch node can read the correct value from partition column.
3. Fixed issues with MERGE on compressed hypertable.
4. Added more testcases.
5. MERGE in distributed hypertables is not supported.
6. Since there is no Custom Scan (HypertableModify) node for MERGE
   with UPDATE/DELETE on compressed hypertables, we don't support this.

Fixes #5139
2023-05-27 10:29:11 +05:30
..
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