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Correct type of front_pathkey to PathKey

In sort_inner_and_outer we iterate a list of PathKey elements, but thevariable is declared as (List *). This mistake is benign, because weonly pass the pointer to lcons() and never dereference it.This exists since ~2004, but it's confusing. So fix and backpatch to allsupported branches.Backpatch-through: 10Discussion:https://postgr.es/m/bf3a6ea1-a7d8-7211-0669-189d5c169374%40enterprisedb.com

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src/backend/optimizer/path
- joinpath.c

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`‎src/backend/optimizer/path/joinpath.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -996,7 +996,7 @@ sort_inner_and_outer(PlannerInfo *root,`
`996`	`996`
`997`	`997`	`foreach(l,all_pathkeys)`
`998`	`998`	`{`
`999`		`-Listfront_pathkey= (List)lfirst(l);`
	`999`	`+PathKeyfront_pathkey= (PathKey)lfirst(l);`
`1000`	`1000`	`List*cur_mergeclauses;`
`1001`	`1001`	`List*outerkeys;`
`1002`	`1002`	`List*innerkeys;`

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Commit93854d5

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`‎src/backend/optimizer/path/joinpath.c`

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