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The _bt_tuplecompare() function mentioned in comment hasn't existed for along time.Peter Geoghegan

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Original file line number	Diff line number	Diff line change
`@@ -3176,9 +3176,8 @@ comparetup_index_btree(const SortTuple a, const SortTuple b,`
`3176`	`3176`	`Tuplesortstate*state)`
`3177`	`3177`	`{`
`3178`	`3178`	`/*`
`3179`		`- * This is similar to _bt_tuplecompare(), but we have already done the`
`3180`		`- * index_getattr calls for the first column, and we need to keep track of`
`3181`		`- * whether any null fields are present. Also see the special treatment`
	`3179`	`+ * This is similar to comparetup_heap(), but expects index tuples. There`
	`3180`	`+ * is also special handling for enforcing uniqueness, and special treatment`
`3182`	`3181`	`* for equal keys at the end.`
`3183`	`3182`	`*/`
`3184`	`3183`	`ScanKeyscanKey=state->indexScanKey;`

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