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Fix possible crash with Parallel Bitmap Heap Scan.

If a Parallel Bitmap Heap scan's chain of leftmost descendentsincludes a BitmapOr whose first child is a BitmapAnd, the prior codingwould mistakenly create a non-shared TIDBitmap and then try to performshared iteration.Report by Tomas Vondra. Patch by Dilip Kumar.Discussion:http://postgr.es/m/50e89684-8ad9-dead-8767-c9545bafd3b6@2ndquadrant.com

1 parentd48bf6a commita3b1c22Copy full SHA for a3b1c22

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src/backend/optimizer/plan
- createplan.c

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`‎src/backend/optimizer/plan/createplan.c`

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Original file line number	Diff line number	Diff line change
`@@ -4926,7 +4926,11 @@ bitmap_subplan_mark_shared(Plan *plan)`
`4926`	`4926`	`bitmap_subplan_mark_shared(`
`4927`	`4927`	`linitial(((BitmapAnd*)plan)->bitmapplans));`
`4928`	`4928`	`elseif (IsA(plan,BitmapOr))`
	`4929`	`+{`
`4929`	`4930`	`((BitmapOr*)plan)->isshared= true;`
	`4931`	`+bitmap_subplan_mark_shared(`
	`4932`	`+linitial(((BitmapOr*)plan)->bitmapplans));`
	`4933`	`+}`
`4930`	`4934`	`elseif (IsA(plan,BitmapIndexScan))`
`4931`	`4935`	`((BitmapIndexScan*)plan)->isshared= true;`
`4932`	`4936`	`else`

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Commita3b1c22

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`‎src/backend/optimizer/plan/createplan.c`

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