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https://issues.apache.org/jira/browse/CALCITE-2926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795574#comment-16795574
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Will Yu commented on CALCITE-2926:
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Thanks [~julianhyde] for explanation :)
I actually also tried something like
table_1.singular_column IN (SELECT * FROM UNNEST(table_2.plural_columns)
and
table_1.singular_column = ANY (SELECT * FROM UNNEST(table_2.plural_columns)
They could be validated. But due to a SEEMINGLY issue (not sure tho) with
blackboard, they could not be converted to RelNode.
Are these supposed to be legal in SQL world? Thanks
> IN operator type validation failure
> -----------------------------------
>
> Key: CALCITE-2926
> URL: https://issues.apache.org/jira/browse/CALCITE-2926
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.18.0
> Reporter: Will Yu
> Priority: Major
>
> There are two columns in my table. Column A's type is VARCHAR while column
> B's type is VARCHAR ARRAY.
> When validating the SQL call `A IN B` the validation failed.
> The root cause seems to be in checkTypes functions in SqlInOperator.
> # Not sure whether UNORDERED comparator is a good candidate because IN
> operands should have order.
> # During being checked in the checker, `canConvertStringInCompare` will give
> a `false` when family is ARRAY and cause this failure.
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