HanumathRao commented on a change in pull request #1417: DRILL-6645: Transform
TopN in Lateral Unnest pipeline to Sort and Limit.
URL: https://github.com/apache/drill/pull/1417#discussion_r207628346
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/Prel.java
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@@ -56,7 +56,13 @@ public boolean
useAbstractConvertersForConversion(RelTraitSet fromTraits,
SelectionVectorMode getEncoding();
boolean needsFinalColumnReordering();
- default Prel addImplicitRowIDCol(List<RelNode> children) {
+ /**
+ * If the operator is in Lateral/Unnest pipeline, then it generates a new
operator which knows how to process
+ * the rows accordingly during execution.
+ * eg: TopNPrel -> SortPrel and LimitPrel
+ * Other operators like FilterPrel, ProjectPrel etc will add an implicit row
id to the output.
+ */
+ default Prel getRelForLateralUnnestPipeline(List<RelNode> children) {
throw new UnsupportedOperationException("Adding Implicit RowID column is
not supported for " +
Review comment:
changed the name of the function to prepareForLateralUnnestPipeline.
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