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Guard against parallel-restricted functions in VALUES expressions.

Obvious brain fade in set_rel_consider_parallel(). Noticed it whileadjusting the adjacent RTE_FUNCTION case.In 9.6, also make the code look more like what I just did in HEADby removing the unnecessary function_rte_parallel_ok subroutine(it does nothing that expression_tree_walker wouldn't do).

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src/backend/optimizer/path
- allpaths.c

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

Lines changed: 3 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -599,11 +599,9 @@ set_rel_consider_parallel(PlannerInfo root, RelOptInfo rel,`
`599`	`599`	`break;`
`600`	`600`
`601`	`601`	`caseRTE_VALUES:`
`602`		`-`
`603`		`-/*`
`604`		`- * The data for a VALUES clause is stored in the plan tree itself,`
`605`		`- * so scanning it in a worker is fine.`
`606`		`- */`
	`602`	`+/* Check for parallel-restricted functions. */`
	`603`	`+if (!is_parallel_safe(root, (Node*)rte->values_lists))`
	`604`	`+return;`
`607`	`605`	`break;`
`608`	`606`
`609`	`607`	`caseRTE_CTE:`

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Commit65a603e

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

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