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Spell "parallel" correctly.
Per David Rowley.
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src/backend/optimizer/README

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@@ -938,7 +938,7 @@ often very limited due to the difficulty of avoiding pipeline stalls.
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Consequently, we do not currently attempt to generate query plans that
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use this technique.
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Instead, we focus on partitioning paralellism, which does not require
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Instead, we focus on partitioning parallelism, which does not require
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that the underlying table be partitioned. It only requires that (1)
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there is some method of dividing the data from at least one of the base
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tables involved in the relation across multiple processes, (2) allowing

src/backend/optimizer/path/costsize.c

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@@ -238,7 +238,7 @@ cost_seqscan(Path *path, PlannerInfo *root,
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* only one worker, the leader often makes a very substantial
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* contribution to executing the parallel portion of the plan, but as
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* more workers are added, it does less and less, because it's busy
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* reading tuples from the workers and doing whatever non-paralell
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* reading tuples from the workers and doing whatever non-parallel
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* post-processing is needed. By the time we reach 4 workers, the
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* leader no longer makes a meaningful contribution. Thus, for now,
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* estimate that the leader spends 30% of its time servicing each

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