[jira] [Created] (CALCITE-1062) Allowing SqlOperator to be overridden in validation

["Sean Hsuan-Yi Chu (JIRA)" <ji...@apache.org>]

Sean Hsuan-Yi Chu created CALCITE-1062:
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             Summary: 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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