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https://issues.apache.org/jira/browse/DRILL-6545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16526946#comment-16526946
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ASF GitHub Bot commented on DRILL-6545:
---------------------------------------
amansinha100 commented on a change in pull request #1347: DRILL-6545:
Projection Push down into Lateral Join operator.
URL: https://github.com/apache/drill/pull/1347#discussion_r199022923
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/common/DrillRelOptUtil.java
##########
@@ -282,4 +286,58 @@ public Void visitCall(RexCall call) {
}
return false;
}
+
+ public static class InputRefVisitor extends RexVisitorImpl<Void> {
+ private final List<RexInputRef> inputRefList;
+
+ public InputRefVisitor() {
+ super(true);
+ inputRefList = new ArrayList<>();
+ }
+
+ public Void visitInputRef(RexInputRef ref) {
+ inputRefList.add(ref);
+ return null;
+ }
+
+ public Void visitCall(RexCall call) {
+ for (RexNode operand : call.operands) {
+ operand.accept(this);
+ }
+ return null;
+ }
+
+ public List<RexInputRef> getInputRefs() {
+ return inputRefList;
+ }
+ }
+
+ public static class RexFieldsTransformer {
Review comment:
Is this a generic transformer for Rex exprs ? If so, pls add a java doc for
future use of this class.
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> Projection Push down into Lateral Join operator.
> ------------------------------------------------
>
> Key: DRILL-6545
> URL: https://issues.apache.org/jira/browse/DRILL-6545
> Project: Apache Drill
> Issue Type: Improvement
> Components: Query Planning & Optimization
> Reporter: Hanumath Rao Maduri
> Assignee: Hanumath Rao Maduri
> Priority: Major
> Fix For: 1.14.0
>
>
> For the Lateral’s logical and physical plan node, we would need to add an
> output RowType such that a Projection can be pushed down to Lateral.
> Currently, Lateral will produce all columns from left and right and it
> depends on a subsequent Project to eliminate unneeded columns. However, this
> will blow up the memory use of Lateral since each column from the left will
> be replicated N times based on N rows coming from UNNEST. We can have a
> ProjectLateralPushdownRule that pushes only the plain columns onto LATERAL
> but keeps the expression evalulations as part of the Project above the
> Lateral.
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