Github user Serhii-Harnyk commented on a diff in the pull request:
https://github.com/apache/drill/pull/748#discussion_r101086894
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/NestedLoopJoinPrule.java
---
@@ -49,7 +49,7 @@ protected boolean checkPreconditions(DrillJoinRel join,
RelNode left, RelNode ri
PlannerSettings settings) {
JoinRelType type = join.getJoinType();
- if (! (type == JoinRelType.INNER || type == JoinRelType.LEFT)) {
+ if (!(type == JoinRelType.INNER || (type == JoinRelType.LEFT &&
JoinUtils.hasScalarSubqueryInput(left, right)))) {
--- End diff --
In the case when table joining with the result of the query with aggregate
function, Drill creates physical plan with left nested loop join.
It is due to this code line:
https://github.com/mapr/incubator-calcite/blob/DrillCalcite1.4.0/core/src/main/java/org/apache/calcite/sql2rel/SqlToRelConverter.java#L1078
So to allow execution of such queries without changes in calcite - allow
left nested loop join for scalar subqueries.
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