Support UUIDv6 in uuid_extract_timestamp() - Mailing list pgsql-hackers

UUIDv6 is the same as UUIDv1 with some fields reordered. We already
supported UUIDv1, so let's add support for UUIDv6. Previously, calls to
uuid_extract_timestamp() would return NULL for UUIDv6 values.

Patch 2 only adds comments. I think the bit manipulation is worthy of
comments, but others may disagree.

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Tristan Partin
PostgreSQL Contributors Team
AWS (https://aws.amazon.com)