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https://issues.apache.org/jira/browse/CALCITE-2582?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16623215#comment-16623215
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Vladimir Sitnikov commented on CALCITE-2582:
--------------------------------------------
RelBuilder does not expose RexSimplify.
Neither it allows to {{.copy(...)}} rels.
{code:java} final RelBuilder relBuilder = call.builder();
RelNode newFilterRel;
if (copyFilter) {
newFilterRel = filter.copy(filter.getTraitSet(), project.getInput(), //
<-- RelBuidler can't perform copy
RexUtil.removeNullabilityCast(relBuilder.getTypeFactory(),
newCondition));
} else {
newFilterRel =
relBuilder.push(project.getInput()).filter(newCondition).build();
}{code}
> FilterProjectTransposeRule does not always simplify the new filter condition
> ----------------------------------------------------------------------------
>
> Key: CALCITE-2582
> URL: https://issues.apache.org/jira/browse/CALCITE-2582
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.17.0
> Reporter: Stamatis Zampetakis
> Assignee: Julian Hyde
> Priority: Minor
> Fix For: 1.18.0
>
>
> After pushing the filter below the project a new condition is going to be
> generated along with a new Filter operator. The new condition is not going to
> be simplified if the filter operator is copied and not created using the
> RelBuilder.
> Thus the resulting plan may contain redundant conditions which can have a
> slight impact on performance. Apart, from that tests verifying the resulting
> (logical/physical) plan may produce indeterministic results if the rule is
> applied with (a different order and in combination with other rules).
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