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https://issues.apache.org/jira/browse/CALCITE-1062?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15114195#comment-15114195
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Sean Hsuan-Yi Chu edited comment on CALCITE-1062 at 1/26/16 3:37 AM:
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Pull request:
https://github.com/apache/calcite/pull/188
[~julianhyde] can you help review ? Thanks.
was (Author: seanhychu):
Pull request:
https://github.com/apache/calcite/pull/187
> Allowing SqlOperator to be overridden in validation
> ---------------------------------------------------
>
> Key: CALCITE-1062
> URL: https://issues.apache.org/jira/browse/CALCITE-1062
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Sean Hsuan-Yi Chu
> Assignee: Sean Hsuan-Yi Chu
>
> Calcite allows function to be overridden at validation step. To be more
> specific, users can provide their SqlOperatorTable, and, at validation step,
> their SqlOperatorTable will be called (method: lookupOperatorOverloads) to
> get a overriding function. However, so far, SqlOperator (e.g., +, - , *,
> etc.) does not have this mechanism yet.
> Since other systems (e.g., Apache Drill) would have more flexible type-checks
> for SqlOperator's operands, this mechanism is necessary for those systems to
> pass through the validation step.
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