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https://issues.apache.org/jira/browse/CALCITE-2926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16797637#comment-16797637
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Julian Hyde commented on CALCITE-2926:
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Those queries don't look valid. In each case, {{table_2.plural_columns}} has to
be an expression, which means that {{table_2}} has to be a table alias, which
means that it has to occur in a FROM clause. So, I think this would be valid:
{code}SELECT * FROM table_1
WHERE table_1.singular_column IN (
SELECT u.c
FROM table_2, UNNEST(table_2.plural_columns) AS u(c)){code}
> 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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