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Correct a comment on logtape.c's leader tape.

randomAccess parallel tuplesorts are disallowed because the leader wouldtry to write to its own leader tape, not because the leader would try towrite to a worker tape directly.Cleanup from commit9da0cc3.

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src/backend/utils/sort
- logtape.c

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`‎src/backend/utils/sort/logtape.c`

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Original file line number	Diff line number	Diff line change
`@@ -471,7 +471,7 @@ ltsConcatWorkerTapes(LogicalTapeSet lts, TapeShare shared,`
`471`	`471`	`* Compute number of hole blocks so that we can later work backwards, and`
`472`	`472`	`* instrument number of physical blocks. We don't simply use physical`
`473`	`473`	`* blocks directly for instrumentation because this would break if we ever`
`474`		`- * subsequently wrote toworker tape.`
	`474`	`+ * subsequently wrote tothe leader tape.`
`475`	`475`	`*`
`476`	`476`	`* Working backwards like this keeps our options open. If shared BufFiles`
`477`	`477`	`* ever support being written to post-export, logtape.c can automatically`

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Commitaefb0a3

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`‎src/backend/utils/sort/logtape.c`

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