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https://issues.apache.org/jira/browse/CALCITE-7615?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yu Xu reassigned CALCITE-7615:
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Assignee: Yu Xu
> MAP_CONCAT does not accept NULL as an argument
> ----------------------------------------------
>
> Key: CALCITE-7615
> URL: https://issues.apache.org/jira/browse/CALCITE-7615
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.42.0
> Reporter: Mihai Budiu
> Assignee: Yu Xu
> Priority: Minor
>
> MAP_CONCAT will throw if any argument is the NULL literal:
> {code:java}
> Function 'MAP_CONCAT' should all be of type map, but it is 'NULL' {code}
> The bug is in SqlLibraryOperators.deriveTypeMapConcat
> {code:java}
> if (!SqlTypeUtil.isMap(operandType)) {
> throw opBinding.newError(
> RESOURCE.typesShouldAllBeMap(
> opBinding.getOperator().getName(),
> operandType.getFullTypeString()));
> }{code}
> Moreover, the error message is not very good, it should say "arguments should
> be all of type MAP".
> There is even a test in SqlOperatorTest for this case, which I think is wrong.
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