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https://issues.apache.org/jira/browse/DRILL-685?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jinfeng Ni reassigned DRILL-685:
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Assignee: Jinfeng Ni
> Use proper trait in Drill Logical rule. Propagate trait from child to parent
> whenever possible.
> ------------------------------------------------------------------------------------------------
>
> Key: DRILL-685
> URL: https://issues.apache.org/jira/browse/DRILL-685
> Project: Apache Drill
> Issue Type: Improvement
> Reporter: Jinfeng Ni
> Assignee: Jinfeng Ni
>
> There are two issues in several Drill Logical Rule.
> 1. When we call convert() to convert the child node from 'None' to
> 'Logical', we pass in the parent's trait. This may not be right.
> For instance,
> Filter
> \
> Sort
> In DrillFilterRule, we will pass filter's trait when convert sort. Since
> filter originally has empty RelCollation, this convert will produce a trivial
> sort, thus may get a logical plan with incorrect order.
> 2. The logical rule does not propagate the trait from child to parent,
> whenever possible. For instance, for the prior example, because filter's
> child is sort, after sort is converted into logical, the filter also has the
> same RelCollation as its child. We should propagate such RelCollation to
> Filter.
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