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

Here are the latest v16 patches.

Changes include:

PATCH 0001.
- REINDEX bugfix -- fix provided by Japin [1]

PATCH 0002.
- REINDEX bugfix test cases - per [1]
- README now list all the internal relations -- per [2]
- Query of VCI internal relation no longer causes confusing HINT -- per [3]
- Renamed the VCI internal relations to have a "pg_" prefix

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[1]
https://www.postgresql.org/message-id/ME0P300MB04453BEE52F84048683460E4B627A%40ME0P300MB0445.AUSP300.PROD.OUTLOOK.COM
[2] https://www.postgresql.org/message-id/CAHut%2BPt8naGc7pH0YG_0G8Wu5aqJiHoT6xP%2BY81_eJWapg9%3DDA%40mail.gmail.com
[3]
https://www.postgresql.org/message-id/ME0P300MB0445307958A2DC0831CEF56DB624A%40ME0P300MB0445.AUSP300.PROD.OUTLOOK.COM

Kind Regards,
Peter Smith.
Fujitsu Australia