ndistinct is an extension that efficiently calculates an
n_distinct value in a PostgreSQL table using HLL (HyperLogLog) [1].
This extension can also automatically set the computed n_distinct
value on a per-column level, making this value available
to the ANALYZE command.

This extension is inspired by research and design performed by
Jim Finnerty <jfinnert@amazon.com>.

Authors: jfinnert@amazon.com, simseih@amazon.com

Allows workers to start on hot standby.

Needed so that passcheck can accurately check whether the worker has
been registered

…ws#266)

In the previous version, we used default int4 alignment and plain storage (non-TOASTable). The data will always be stored in-line and not compressed. An error will be reported if the value exceeds the limit:
ERROR: row is too big: size xxx, maximum size xxx.

With this change, users can customize the alignment and storage strategies. Compression or out-of-line storage can be used depending on the storage strategy (https://www.postgresql.org/docs/current/storage-toast.html).

The default alignment is int4 while the default storage is plain, compatible with previous versions.

…th_databases_to_skip (aws#268)

Previously users or databases set in pgtle.clientauth_users_to_skip and pgtle.clientauth_databases_to_skip do not take effect if their names are in mixed case. This commit handles using mixed case in pgtle.clientauth_users_to_skip and pgtle.clientauth_databases_to_skip.

…ter is not enabled (aws#270)