Horton

Enable parallelism in REFRESH MATERIALIZED VIEW.

Thomas Munro <tmunro@postgresql.org>

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Commit: 9e7ccd9ef64d05e87ceb1985d459bef9031205c0
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2021-03-17T02:04:17Z
Releases: 14.0 
Enable parallelism in REFRESH MATERIALIZED VIEW.

Pass CURSOR_OPT_PARALLEL_OK to pg_plan_query() so that parallel plans
are considered when running the underlying SELECT query.  This wasn't
done in commit e9baa5e9, which did this for CREATE MATERIALIZED VIEW,
because it wasn't yet known to be safe.

Since REFRESH always inserts into a freshly created table before later
merging or swapping the data into place with separate operations, we can
enable such plans here too.

Author: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>
Reviewed-by: Hou, Zhijie <houzj.fnst@cn.fujitsu.com>
Reviewed-by: Luc Vlaming <luc@swarm64.com>
Reviewed-by: Thomas Munro <thomas.munro@gmail.com>
Discussion: https://postgr.es/m/CALj2ACXg-4hNKJC6nFnepRHYT4t5jJVstYvri%2BtKQHy7ydcr8A%40mail.gmail.com

Files

PathChange+/−
doc/src/sgml/parallel.sgml modified +21 −5
src/backend/commands/matview.c modified +1 −1
src/test/regress/expected/write_parallel.out modified +3 −0
src/test/regress/sql/write_parallel.sql modified +3 −0

Documentation touched

Discussion