[jira] [Created] (DRILL-4642) Let RexBuilder.ensureType() mechanism take place during Rex conversion.

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

Sean Hsuan-Yi Chu created DRILL-4642:
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             Summary: Let RexBuilder.ensureType() mechanism take place during Rex conversion.
                 Key: DRILL-4642
                 URL: https://issues.apache.org/jira/browse/DRILL-4642
             Project: Apache Drill
          Issue Type: Bug
          Components: Query Planning & Optimization
            Reporter: Sean Hsuan-Yi Chu
            Assignee: Sean Hsuan-Yi Chu
             Fix For: 1.7.0


In DRILL-4372, the logic of ensuring same type is removed since, in some case such as below, undesirable cast function will be added and cause failure.
{code}
SELECT * 
FROM T 
WHERE (cast(col1 as timestamp)  - to_timestamp(col2,'YYYY-MM-dd HH:mm:ss') < interval 'X XX:XX:XX' day to second)
{code}

The fundamental reason for this behavior roots in Drill-Calcite [1], where SqlNode WHERE is expanded to a new object but is not passed into validation step.
[1] https://github.com/mapr/incubator-calcite/blob/DrillCalcite1.4.0-mapr-1.4.0/core/src/main/java/org/apache/calcite/sql/validate/SqlValidatorImpl.java#L3362



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