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https://issues.apache.org/jira/browse/CALCITE-583?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde updated CALCITE-583:
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Fix Version/s: next
> Operator `||` mishandled ANY type
> ----------------------------------
>
> Key: CALCITE-583
> URL: https://issues.apache.org/jira/browse/CALCITE-583
> Project: Calcite
> Issue Type: Bug
> Reporter: Sean Hsuan-Yi Chu
> Assignee: Julian Hyde
> Fix For: next
>
> Attachments: CALCITE-583.1.patch
>
>
> For instance,
> select ANY type || ANY type ... leads assertion error from:
> assert (precision >= 0) || (precision ==
> RelDataType.PRECISION_NOT_SPECIFIED);
> (SqlTypeFactoryImpl.java( line: 62))
> Essentially, it is because, SqlReturnTypeInference of `||` is
> DYADIC_STRING_SUM_PRECISION. When doing inference for the return type, there
> is one data field in DYADIC_STRING_SUM_PRECISION called "precision", which is
> calculated as arg0.precison + arg1.precision.
> However, for ANY type, the precision is defined as -1. So the above
> calculation will give "-2" for ANY type operands, in turn, breaking up the
> assertion.
> Moreover, `||` can fail when the two operands have different types (e.g., ANY
> type || String). In the No schema system, ANY type can be quite prevalent.
> For example, select ANY type || string || ANY type ... where, in addition to
> two ANY types on two sides, we have a string in between.
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