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Spell "parallel" correctly.

Per David Rowley.

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Original file line number	Diff line number	Diff line change
`@@ -938,7 +938,7 @@ often very limited due to the difficulty of avoiding pipeline stalls.`
`938`	`938`	`Consequently, we do not currently attempt to generate query plans that`
`939`	`939`	`use this technique.`
`940`	`940`
`941`		`-Instead, we focus on partitioningparalellism, which does not require`
	`941`	`+Instead, we focus on partitioningparallelism, which does not require`
`942`	`942`	`that the underlying table be partitioned. It only requires that (1)`
`943`	`943`	`there is some method of dividing the data from at least one of the base`
`944`	`944`	`tables involved in the relation across multiple processes, (2) allowing`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -238,7 +238,7 @@ cost_seqscan(Path path, PlannerInfo root,`
`238`	`238`	`* only one worker, the leader often makes a very substantial`
`239`	`239`	`* contribution to executing the parallel portion of the plan, but as`
`240`	`240`	`* more workers are added, it does less and less, because it's busy`
`241`		`- * reading tuples from the workers and doing whatever non-paralell`
	`241`	`+ * reading tuples from the workers and doing whatever non-parallel`
`242`	`242`	`* post-processing is needed. By the time we reach 4 workers, the`
`243`	`243`	`* leader no longer makes a meaningful contribution. Thus, for now,`
`244`	`244`	`* estimate that the leader spends 30% of its time servicing each`

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