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_r207629168
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/TopNPrel.java
##########
@@ -115,6 +118,16 @@ public Prel addImplicitRowIDCol(List<RelNode> children) {
.replace(this.getTraitSet().getTrait(DrillDistributionTraitDef.INSTANCE))
.replace(collationTrait)
.replace(DRILL_PHYSICAL);
- return (Prel) this.copy(traits, children);
+ return transformTopNToSortAndLimit(children, traits, collationTrait);
+ }
+
+ private Prel transformTopNToSortAndLimit(List<RelNode> children, RelTraitSet
traits, RelCollation collationTrait) {
+ SortPrel sortprel = new SortPrel(this.getCluster(), traits,
children.get(0), collationTrait);
+ RexNode offset =
this.getCluster().getRexBuilder().makeExactLiteral(BigDecimal.valueOf(0),
+
this.getCluster().getTypeFactory().createSqlType(SqlTypeName.INTEGER));
+ RexNode limit =
this.getCluster().getRexBuilder().makeExactLiteral(BigDecimal.valueOf(this.limit),
+
this.getCluster().getTypeFactory().createSqlType(SqlTypeName.INTEGER));
+ LimitPrel limitPrel = new LimitPrel(this.getCluster(), traits, sortprel,
offset, limit, false);
Review comment:
Yes Limit created should be partition limit but it is not created here
because that API is not yet available in the master. Once it is available it
will be rebased upon it.
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