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https://issues.apache.org/jira/browse/DRILL-6616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16562153#comment-16562153
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ASF GitHub Bot commented on DRILL-6616:
---------------------------------------
HanumathRao commented on a change in pull request #1401: DRILL-6616: Batch
Processing for Lateral/Unnest
URL: https://github.com/apache/drill/pull/1401#discussion_r206249771
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/common/DrillRelOptUtil.java
##########
@@ -317,6 +319,33 @@ public Void visitCall(RexCall call) {
}
}
+ /**
+ * Given a list of rexnodes it transforms the rexnodes by changing the expr
to use new index mapped to the old index.
+ * @param builder : RexBuilder from the planner.
+ * @param exprs: RexNodes to be transformed.
+ * @param corrMap: Mapping between old index to new index.
+ * @return
+ */
+ public static List<RexNode> transformExprs(RexBuilder builder, List<RexNode>
exprs, Map<Integer, Integer> corrMap) {
Review comment:
AFAIK, calcite does something like this but it is done in a private method.
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> Batch Processing for Lateral/Unnest
> -----------------------------------
>
> Key: DRILL-6616
> URL: https://issues.apache.org/jira/browse/DRILL-6616
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Relational Operators
> Affects Versions: 1.14.0
> Reporter: Sorabh Hamirwasia
> Assignee: Sorabh Hamirwasia
> Priority: Major
> Fix For: 1.15.0
>
>
> Implement the execution and planner side changes for the batch processing
> done by lateral and unnest. Based on the prototype we found performance to be
> much better as compared to initial row-by-row execution.
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