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Doc: fix outdated wording about parallel seq scans

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56788d215 adjusted the parallel seq scan code so that instead of handing
out a single block at a time to parallel workers, it now hands out ranges
of blocks.

Here we update the documentation which still claimed that workers received
just 1 block at a time.

Reported-by: Zhang Mingli
Discussion: https://postgr.es/m/17c99615-2c3b-4e4e-9d0b-424a66a7bccd@Spark
Backpatch-through: 14, where 56788d215 was added.
This commit is contained in:
David Rowley 2022-10-21 09:29:08 +13:00
parent c8e4030d1b
commit 42d01f59c7
1 changed files with 3 additions and 2 deletions
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5
doc/src/sgml/parallel.sgml
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@ -272,8 +272,9 @@ EXPLAIN SELECT * FROM pgbench_accounts WHERE filler LIKE '%x%';
<listitem> <listitem>
<para> <para>
In a <emphasis>parallel sequential scan</emphasis>, the table's blocks will In a <emphasis>parallel sequential scan</emphasis>, the table's blocks will
be divided among the cooperating processes. Blocks are handed out one be divided into ranges and shared among the cooperating processes. Each
at a time, so that access to the table remains sequential. worker process will complete the scanning of its given range of blocks before
requesting an additional range of blocks.
</para> </para>
</listitem> </listitem>
<listitem> <listitem>