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Remove obsolete nbtree duplicate entries comment.

Remove a comment from the Berkeley days claiming that nbtree mustdisambiguate duplicate keys within _bt_moveright(). There is no specialcare taken around duplicates within _bt_moveright(), at least sincecommit9e85183 removed inscrutable _bt_moveright() code to handlepages full of duplicates.

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src/backend/access/nbtree
- nbtinsert.c

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

Lines changed: 1 addition & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -814,10 +814,7 @@ _bt_findinsertloc(Relation rel,`
`814`	`814`	`*INCOMPLETE_SPLIT flag on it, and release the buffer.`
`815`	`815`	`*`
`816`	`816`	`*The locking interactions in this code are critical. You should`
`817`		`- *grok Lehman and Yao's paper before making any changes. In addition,`
`818`		`- *you need to understand how we disambiguate duplicate keys in this`
`819`		`- *implementation, in order to be able to find our location using`
`820`		`- *L&Y "move right" operations.`
	`817`	`+ *grok Lehman and Yao's paper before making any changes.`
`821`	`818`	`*----------`
`822`	`819`	`*/`
`823`	`820`	`staticvoid`

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Commit61a4480

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

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