Github user arina-ielchiieva commented on a diff in the pull request:

    https://github.com/apache/drill/pull/889#discussion_r131870970
  
    --- Diff: 
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/join/JoinUtils.java
 ---
    @@ -204,24 +205,28 @@ public static void 
addLeastRestrictiveCasts(LogicalExpression[] leftExpressions,
     
       /**
        * Utility method to check if a subquery (represented by its root 
RelNode) is provably scalar. Currently
    -   * only aggregates with no group-by are considered scalar. In the 
future, this method should be generalized
    -   * to include more cases and reconciled with Calcite's notion of scalar.
    +   * only aggregates with no group-by and sub input rel with one row are 
considered scalar. In the future,
    +   * this method should be generalized to include more cases and 
reconciled with Calcite's notion of scalar.
        * @param root The root RelNode to be examined
        * @return True if the root rel or its descendant is scalar, False 
otherwise
        */
       public static boolean isScalarSubquery(RelNode root) {
         DrillAggregateRel agg = null;
    -    RelNode currentrel = root;
    -    while (agg == null && currentrel != null) {
    -      if (currentrel instanceof DrillAggregateRel) {
    -        agg = (DrillAggregateRel)currentrel;
    -      } else if (currentrel instanceof RelSubset) {
    -        currentrel = ((RelSubset)currentrel).getBest() ;
    -      } else if (currentrel.getInputs().size() == 1) {
    +    RelNode currentRel = root;
    +    boolean hasMoreInputs = false;
    +    while (agg == null && currentRel != null) {
    +      if (currentRel instanceof DrillAggregateRel) {
    +        agg = (DrillAggregateRel)currentRel;
    +      } else if (currentRel instanceof RelSubset) {
    +        currentRel = ((RelSubset)currentRel).getBest() ;
    --- End diff --
    
    `currentRel = ((RelSubset) currentRel).getBest() ;`


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