Commit1e87198

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Fix division by zero in _bt_vacuum_needs_cleanup()

Checks inside _bt_vacuum_needs_cleanup() allow division by zero to happen whenmetad->btm_last_cleanup_num_heap_tuples == 0. This commit adjusts theexpression so that no division by zero might happen.Reported-by: Piotr StefaniakDiscussion:https://postgr.es/m/DB8PR03MB5931C41F7787A95313F08322F22A0%40DB8PR03MB5931.eurprd03.prod.outlook.comReviewed-by: Masahiko SawadaBackpatch-through: 11

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Original file line number	Diff line number	Diff line change
`@@ -835,7 +835,7 @@ _bt_vacuum_needs_cleanup(IndexVacuumInfo *info)`
`835`	`835`	`prev_num_heap_tuples=metad->btm_last_cleanup_num_heap_tuples;`
`836`	`836`
`837`	`837`	`if (cleanup_scale_factor <=0\|\|`
`838`		`-prev_num_heap_tuples<0\|\|`
	`838`	`+prev_num_heap_tuples <=0\|\|`
`839`	`839`	`(info->num_heap_tuples-prev_num_heap_tuples) /`
`840`	`840`	`prev_num_heap_tuples >=cleanup_scale_factor)`
`841`	`841`	`result= true;`

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