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Compare varnullingrels too in assign_param_for_var().

Oversight in2489d76. Preliminary analysis suggests that theproblem may be unreachable --- but if we did have instances ofthe same column with different varnullingrels, we'd surely needto treat them as different Params.Discussion:https://postgr.es/m/412552.1706203379@sss.pgh.pa.us

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src/backend/optimizer/util
- paramassign.c

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`‎src/backend/optimizer/util/paramassign.c`

Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -90,7 +90,8 @@ assign_param_for_var(PlannerInfo root, Var var)`
`90`	`90`	`pvar->varattno==var->varattno&&`
`91`	`91`	`pvar->vartype==var->vartype&&`
`92`	`92`	`pvar->vartypmod==var->vartypmod&&`
`93`		`-pvar->varcollid==var->varcollid)`
	`93`	`+pvar->varcollid==var->varcollid&&`
	`94`	`+bms_equal(pvar->varnullingrels,var->varnullingrels))`
`94`	`95`	`returnpitem->paramId;`
`95`	`96`	`}`
`96`	`97`	`}`

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Commit5e444a2

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`‎src/backend/optimizer/util/paramassign.c`

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