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https://issues.apache.org/jira/browse/CALCITE-5533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17689960#comment-17689960
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Oliver Lee commented on CALCITE-5533:
-------------------------------------
cc [~julianhyde]
> Unclear type name in FamilyOperandTypeChecker getAllowedSignature()
> -------------------------------------------------------------------
>
> Key: CALCITE-5533
> URL: https://issues.apache.org/jira/browse/CALCITE-5533
> Project: Calcite
> Issue Type: Bug
> Reporter: Oliver Lee
> Priority: Minor
>
> The error message from {{getAllowedSignature()}} for
> {{FamilyOperandTypeChecker}} [uses the SqlTypeFamily
> |https://github.com/apache/calcite/blob/main/core/src/main/java/org/apache/calcite/sql/type/FamilyOperandTypeChecker.java#L190]instead
> of the actual type that is used in the function call.
>
> For example this query using the Big Query dialect (context: BQ {{TIMESTAMP}}
> is Calcite's {{TIMESTAMP_WITH_LOCAL_TIME_ZONE}})
> {quote}SELECT TIMESTAMP_DIFF(1, TIMESTAMP "2008-12-25 15:30:00", HOUR)
> {quote}
> You would expect the error message in the current state to be produced using
> Calcite types:
> {quote}Cannot apply 'TIMESTAMP_DIFF' to arguments of type
> 'TIMESTAMP_DIFF(<INTEGER>, <TIMESTAMP_WITH_LOCAL_TIME_ZONE(0)>, <INTERVAL
> HOUR>)'. Supported form(s):
> 'TIMESTAMP_DIFF(<+TIMESTAMP_WITH_LOCAL_TIME_ZONE+>,
> <+TIMESTAMP_WITH_LOCAL_TIME_ZONE+>, <ANY>)'
> {quote}
> However the error message is actually:
>
> {quote}Cannot apply 'TIMESTAMP_DIFF' to arguments of type
> 'TIMESTAMP_DIFF(<INTEGER>, <TIMESTAMP_WITH_LOCAL_TIME_ZONE(0)>, <INTERVAL
> HOUR>)'. Supported form(s): 'TIMESTAMP_DIFF(<+TIMESTAMP+>, <+TIMESTAMP+>,
> <ANY>)'
> {quote}
>
> The
> [TIMESTAMP_DIFF|https://github.com/apache/calcite/blob/main/core/src/main/java/org/apache/calcite/sql/fun/SqlLibraryOperators.java#L811]
> function checks that the operands are from the
> [SqlTypeFamily.TIMESTAMP|https://github.com/apache/calcite/blob/main/core/src/main/java/org/apache/calcite/sql/type/SqlTypeFamily.java#L182]
> type family and the error message [uses the family
> name|https://github.com/apache/calcite/blob/main/core/src/main/java/org/apache/calcite/sql/type/FamilyOperandTypeChecker.java#L190]
> SqlTypeFamily.TIMESTAMP, not the SqlTypeName
> [SqlTypeName.TIMESTAMP_WITH_LOCAL_TIME_ZONE|https://github.com/apache/calcite/blob/main/core/src/main/java/org/apache/calcite/sql/type/SqlTypeFamily.java#L183].
>
>
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