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Doc: mention limitation of the number of resultset columns

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The PostgreSQL limitations section of the documents mentioned the limit
on the number of columns that can exist in a table.  Users might be
surprised to find that there's also a limit on the number of columns that
can exist in a targetlist.  Users may experience restrictions which
surprise them if they happened to select a large number of columns from
several tables with many columns.  Here we document that there is a
limitation on this and mention what that limit actually is.

Wording proposal by Alvaro Herrera

Reported-by: Vladimir Sitnikov
Author: Dave Crammer
Reviewed-by: Tom Lane
Discussion: https://postgr.es/m/CAB=Je-E18aTYpNqje4mT0iEADpeGLSzwUvo3H9kRRuDdsNo4aQ@mail.gmail.com
Backpatch-through: 12, where the limitations section was added
This commit is contained in:
David Rowley 2022-06-01 12:44:45 +12:00
parent e1ed1a7aa5
commit bbb6489042
1 changed files with 6 additions and 0 deletions
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6
doc/src/sgml/limits.sgml
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@ -62,6 +62,12 @@
below</entry>
</row>
<row>
<entry>columns in a result set</entry>
<entry>1664</entry>
<entry></entry>
</row>
<row>
<entry>field size</entry>
<entry>1 GB</entry>