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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