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Clear up btree_xlog_split() alignment comment.

Adjust a comment that describes how alignment of the new left page highkey works in btree_xlog_split(), the nbtree page split REDO routine.The wording used before commit2c03216 is much clearer, so go backto that.

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src/backend/access/nbtree
- nbtxlog.c

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

Lines changed: 5 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -281,7 +281,11 @@ btree_xlog_split(bool onleft, XLogReaderState *record)`
`281`	`281`	`datalen-=newitemsz;`
`282`	`282`	`}`
`283`	`283`
`284`		`-/* Extract left hikey and its size (assuming 16-bit alignment) */`
	`284`	`+/*`
	`285`	`+ * Extract left hikey and its size. We assume that 16-bit alignment`
	`286`	`+ * is enough to apply IndexTupleSize (since it's fetching from a`
	`287`	`+ * uint16 field).`
	`288`	`+ */`
`285`	`289`	`left_hikey= (IndexTuple)datapos;`
`286`	`290`	`left_hikeysz=MAXALIGN(IndexTupleSize(left_hikey));`
`287`	`291`	`datapos+=left_hikeysz;`

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Commit0c41c83

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

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