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Fix BuildIndexValueDescription for expressions

In804b6b6 we modifiedBuildIndexValueDescription to pay attention to which columns are visibleto the user, but unfortunatley that commit neglected to consider indexeswhich are built on expressions.Handle error-reporting of violations of constraint indexes based onexpressions by not returning any detail when the user does not havetable-level SELECT rights.Backpatch to 9.0, as the prior commit was.Pointed out by Tom.

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src/backend/access/index
- genam.c

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`‎src/backend/access/index/genam.c`

Lines changed: 9 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -209,10 +209,15 @@ BuildIndexValueDescription(Relation indexRelation,`
`209`	`209`	`{`
`210`	`210`	`AttrNumberattnum=idxrec->indkey.values[keyno];`
`211`	`211`
`212`		`-aclresult=pg_attribute_aclcheck(indrelid,attnum,GetUserId(),`
`213`		`-ACL_SELECT);`
`214`		`-`
`215`		`-if (aclresult!=ACLCHECK_OK)`
	`212`	`+/*`
	`213`	`+ * Note that if attnum == InvalidAttrNumber, then this is an`
	`214`	`+ * index based on an expression and we return no detail rather`
	`215`	`+ * than try to figure out what column(s) the expression includes`
	`216`	`+ * and if the user has SELECT rights on them.`
	`217`	`+ */`
	`218`	`+if (attnum==InvalidAttrNumber\|\|`
	`219`	`+pg_attribute_aclcheck(indrelid,attnum,GetUserId(),`
	`220`	`+ACL_SELECT)!=ACLCHECK_OK)`
`216`	`221`	`{`
`217`	`222`	`/* No access, so clean up and return */`
`218`	`223`	`ReleaseSysCache(ht_idx);`

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Commit39c46c5

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`‎src/backend/access/index/genam.c`

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