Mehant Baid created DRILL-584:
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Summary: ExpressionTreeMaterializer injects incorrect implicit
casts
Key: DRILL-584
URL: https://issues.apache.org/jira/browse/DRILL-584
Project: Apache Drill
Issue Type: Bug
Reporter: Mehant Baid
Assignee: Mehant Baid
In ExpressionTreeMaterializer.visitFunctionCall() we try to get a best match
between the DrillFuncHolder and the input call. We may match the input call
with a DrillFuncHolder whose argument type is different from that of the input,
but is allowed to be implicitly cast as per the precedence rules.
However when we inject implicit casts to compensate for the difference in
argument types, we again use the same matching method to resolve the implicit
cast to DrillFuncHolder. In the case of implicit casts should not match with a
DrillFuncHolder that has different argument types than the input. We should
return only the DrillFuncHolder that exactly matches the argument types and if
no such holder is present should return NULL.
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