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Move comment about test slightly closer to test.

The addition of a TestForOldSnapshot() call here has made thereferent of this comment slightly less clear, so move the commentto compensate.Amit Kapila (as part of the parallel index scan patch)

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src/backend/access/nbtree
- nbtsearch.c

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`‎src/backend/access/nbtree/nbtsearch.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -1345,10 +1345,10 @@ _bt_steppage(IndexScanDesc scan, ScanDirection dir)`
`1345`	`1345`	`CHECK_FOR_INTERRUPTS();`
`1346`	`1346`	`/* step right one page */`
`1347`	`1347`	`so->currPos.buf=_bt_getbuf(rel,blkno,BT_READ);`
`1348`		`-/* check for deleted page */`
`1349`	`1348`	`page=BufferGetPage(so->currPos.buf);`
`1350`	`1349`	`TestForOldSnapshot(scan->xs_snapshot,rel,page);`
`1351`	`1350`	`opaque= (BTPageOpaque)PageGetSpecialPointer(page);`
	`1351`	`+/* check for deleted page */`
`1352`	`1352`	`if (!P_IGNORE(opaque))`
`1353`	`1353`	`{`
`1354`	`1354`	`PredicateLockPage(rel,blkno,scan->xs_snapshot);`

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Commit8a815e3

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`‎src/backend/access/nbtree/nbtsearch.c`

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