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https://issues.apache.org/jira/browse/CALCITE-5833?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rong Rong updated CALCITE-5833:
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Summary: Support literal parsing for AggregateCall (was: Support
`getOperandLiteralValue` in `Aggregate.AggCallBinding`)
> Support literal parsing for AggregateCall
> ------------------------------------------
>
> Key: CALCITE-5833
> URL: https://issues.apache.org/jira/browse/CALCITE-5833
> Project: Calcite
> Issue Type: New Feature
> Reporter: Rong Rong
> Priority: Major
>
> I wasn't sure if this is the right way to support the feature please share
> your feedback:
> h2. goal
> to support configuring aggregate function based on literal input fields, such
> as
> {code:sql}
> SELECT
> histogram(valCol1, 16), -- 16 bit precision of the final results
> histogram(valCol2, 8) -- 8 bit precision of the final results
> FROM tbl
> {code}
> h2. approach
> I was trying to register a ReturnType inference by opBinding the 2nd literal
> argument and create an explicit type based on the literal value. but it tells
> me {{AggCallBinding}} doesn't implement {{getOpreandLiteralValue}} method,
> should I
> - add support for this method in aggregate call binding? it doesn't seems
> easy consider there's no RexNode storage in this call binding
> - change the {{AggregateCall#create}} method to infer the return type so that
> we dont need to change the {{AggCallBinding}}
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