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https://issues.apache.org/jira/browse/CALCITE-547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14255989#comment-14255989
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Vladimir Sitnikov commented on CALCITE-547:
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Well, {{org.apache.calcite.sql.fun.SqlItemOperator#inferReturnType}} seems to
really miss {{createTypeWithNullability(..., true)}} for {{ANY}} first operand
> Fix return type of item operator when operand type is not known
> ---------------------------------------------------------------
>
> Key: CALCITE-547
> URL: https://issues.apache.org/jira/browse/CALCITE-547
> Project: Calcite
> Issue Type: Bug
> Reporter: Mehant Baid
> Assignee: Mehant Baid
> Attachments: CALCITE-547.patch
>
>
> While inferring the return type of the item operator (SqlItemOperator.
> inferReturnType()) when the SqlTypeName of the operand is ANY we set the
> nullability of return type to be false. Since the type of the operand is not
> known at this point we cannot know the return type and its nullability.
> Setting nullability to false was causing wrong results in Drill when we were
> performing count(item op), Calcite would set nullability to be false and the
> count(item op) would get replaced with count(0) causing wrong results if the
> column is eventually resolved to be nullable and has nulls in it.
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