Re: [WIP]Vertical Clustered Index (columnar store extension) - take2

Here are the latest v19* patches.

Changes include:

PATCH 0002.
Cleaning
- Removed unused code (per Timur's patch 0002 [1])
- Removed vci_pg_copy.h; Combined this into postrgesql_copy.h
Code changes
- Changed linear search to switch (per Timur's patch 0003 [1])
- Removed UpperUniquePath (fix build issue due to master commit 24225ad)

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[1] Timur's patches.
https://www.postgresql.org/message-id/07c53a696afb8089d724214dbaeded6fcaa8fc0d.camel%40postgrespro.ru

Kind Regards,
Peter Smith.
Fujitsu Australia