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doc: Consistently use result set in documentation
We use "result set" in all other places so let's be consistent across the entire documentation. Reported-by: grantgryczan@gmail.com Discussion: https://postgr.es/m/172187924855.915373.15595156724215203822@wrigleys.postgresql.org
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@ -423,7 +423,7 @@ EXPLAIN SELECT * FROM pgbench_accounts WHERE filler LIKE '%x%';
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Append</literal> node can have both partial and non-partial child plans.
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Append</literal> node can have both partial and non-partial child plans.
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Non-partial children will be scanned by only a single process, since
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Non-partial children will be scanned by only a single process, since
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scanning them more than once would produce duplicate results. Plans that
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scanning them more than once would produce duplicate results. Plans that
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involve appending multiple results sets can therefore achieve
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involve appending multiple result sets can therefore achieve
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coarse-grained parallelism even when efficient partial plans are not
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coarse-grained parallelism even when efficient partial plans are not
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available. For example, consider a query against a partitioned table
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available. For example, consider a query against a partitioned table
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that can only be implemented efficiently by using an index that does
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that can only be implemented efficiently by using an index that does
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