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Remove useless variable.

flatten_join_alias_vars_mutator counted attnums, but didn'tdo anything with the count (no doubt it did at one time).Noted by buildfarm member seawasp.

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src/backend/optimizer/util
- var.c

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`‎src/backend/optimizer/util/var.c`

Lines changed: 0 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -774,16 +774,13 @@ flatten_join_alias_vars_mutator(Node *node,`
`774`	`774`	`RowExpr*rowexpr;`
`775`	`775`	`List*fields=NIL;`
`776`	`776`	`List*colnames=NIL;`
`777`		`-AttrNumberattnum;`
`778`	`777`	`ListCell*lv;`
`779`	`778`	`ListCell*ln;`
`780`	`779`
`781`		`-attnum=0;`
`782`	`780`	`Assert(list_length(rte->joinaliasvars)==list_length(rte->eref->colnames));`
`783`	`781`	`forboth(lv,rte->joinaliasvars,ln,rte->eref->colnames)`
`784`	`782`	`{`
`785`	`783`	`newvar= (Node*)lfirst(lv);`
`786`		`-attnum++;`
`787`	`784`	`/* Ignore dropped columns */`
`788`	`785`	`if (newvar==NULL)`
`789`	`786`	`continue;`

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Commitc2d81ee

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`‎src/backend/optimizer/util/var.c`

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