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Revert: Remove useless self-joins

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This commit reverts d3d55ce571 and subsequent fixes 2b26a69455, 93c85db3b5,
b44a1708ab, b7f315c9d7, 8a8ed916f7, b5fb6736ed, 0a93f803f4, e0477837ce,
a7928a57b9, 5ef34a8fc3, 30b4955a46, 8c441c0827, 028b15405b, fe093994db,
489072ab7a, and 466979ef03.

We are quite late in the release cycle and new bugs continue to appear.  Even
though we have fixes for all known bugs, there is a risk of throwing many
bugs to end users.

The plan for self-join elimination would be to do more review and testing,
then re-commit in the early v18 cycle.

Reported-by: Tom Lane
Discussion: https://postgr.es/m/2422119.1714691974%40sss.pgh.pa.us
This commit is contained in:
Alexander Korotkov
2024-05-06 14:35:58 +03:00
parent 81b2252e60
commit d1d286d83c
14 changed files with 69 additions and 2883 deletions
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16
doc/src/sgml/config.sgml
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@ -5586,22 +5586,6 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="
</listitem>
</varlistentry>
<varlistentry id="guc-enable_self_join_removal" xreflabel="enable_self_join_removal">
<term><varname>enable_self_join_removal</varname> (<type>boolean</type>)
<indexterm>
<primary><varname>enable_self_join_removal</varname> configuration parameter</primary>
</indexterm>
</term>
<listitem>
<para>
Enables or disables the query planner's optimization which analyses
the query tree and replaces self joins with semantically equivalent
single scans. Takes into consideration only plain tables.
The default is <literal>on</literal>.
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-enable-seqscan" xreflabel="enable_seqscan">
<term><varname>enable_seqscan</varname> (<type>boolean</type>)
<indexterm>