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https://issues.apache.org/jira/browse/DRILL-4642?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15262487#comment-15262487
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ASF GitHub Bot commented on DRILL-4642:
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Github user hsuanyi commented on the pull request:
https://github.com/apache/drill/pull/489#issuecomment-215490663
@jinfengni Can you help review?
> 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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