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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