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Fix recently-introduced crash in array_contain_compare().

Silly oversight in commit1dc5ebc:when array2 is an expanded array, it might have array2->xpn.dnulls equalto NULL, indicating the array is known null-free. The code wasn'texpecting that, because it formerly always used deconstruct_array() whichalways delivers a nulls array.Per bug #13334 from Regina Obe.

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src/backend/utils/adt
- arrayfuncs.c

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`‎src/backend/utils/adt/arrayfuncs.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -4110,7 +4110,7 @@ array_contain_compare(AnyArrayType array1, AnyArrayType array2, Oid collation,`
`4110`	`4110`	`for (j=0;j<nelems2;j++)`
`4111`	`4111`	`{`
`4112`	`4112`	`Datumelt2=values2[j];`
`4113`		`-boolisnull2=nulls2[j];`
	`4113`	`+boolisnull2=nulls2 ?nulls2[j] : false;`
`4114`	`4114`	`booloprresult;`
`4115`	`4115`
`4116`	`4116`	`if (isnull2)`

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Commit49ad32d

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`‎src/backend/utils/adt/arrayfuncs.c`

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