docs: clarify that CREATE TABLE ... _AS_ can be parallelized
CREATE TABLE without AS doesn't have anything to parallelize.
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@ -152,7 +152,7 @@ EXPLAIN SELECT * FROM pgbench_accounts WHERE filler LIKE '%x%';
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The query writes any data or locks any database rows. If a query
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contains a data-modifying operation either at the top level or within
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a CTE, no parallel plans for that query will be generated. As an
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exception, the commands <literal>CREATE TABLE</literal>, <literal>SELECT
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exception, the commands <literal>CREATE TABLE ... AS</literal>, <literal>SELECT
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INTO</literal>, and <literal>CREATE MATERIALIZED VIEW</literal> which create a new
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table and populate it can use a parallel plan.
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</para>
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