Horton

Re: PoC/WIP: Extended statistics on expressions

Noah Misch <noah@leadboat.com>

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From: Noah Misch <noah@leadboat.com>
To: Tomas Vondra <tomas.vondra@enterprisedb.com>
Cc: Dean Rasheed <dean.a.rasheed@gmail.com>, Justin Pryzby <pryzby@telsasoft.com>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>
Date: 2021-06-06T05:37:40Z
Lists: pgsql-hackers 
On Sat, Mar 27, 2021 at 01:17:14AM +0100, Tomas Vondra wrote:
> OK, pushed after a bit more polishing and testing.

This added a "transformed" field to CreateStatsStmt, but it didn't mention
that field in src/backend/nodes.  Should those functions handle the field?

Commits

  1. Disallow extended statistics on system columns

  2. Identify simple column references in extended statistics

  3. Don't print extra parens around expressions in extended stats

  4. Change position of field "transformed" in struct CreateStatsStmt.

  5. Add transformed flag to nodes/*funcs.c for CREATE STATISTICS

  6. Stabilize stats_ext test with other collations

  7. Extended statistics on expressions

  8. Reduce duration of stats_ext regression tests

  9. Allow composite types in catalog bootstrap

  10. Convert Typ from array to list in bootstrap

  11. Disallow CREATE STATISTICS on system catalogs