kgyrtkirk commented on a change in pull request #1286:
URL: https://github.com/apache/hive/pull/1286#discussion_r569552909



##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/OperatorUtils.java
##########
@@ -654,11 +655,18 @@ public static String findTableColNameOf(Operator<?> 
start, String internalColNam
         continue;
       }
       // If columnName is the output of a ColumnExpr get the original 
columnName from the Expr Map
-      if (currentOp.getColumnExprMap() != null && 
currentOp.getColumnExprMap().containsKey(internalColName)
-              && currentOp.getColumnExprMap().get(internalColName) instanceof 
ExprNodeColumnDesc) {
-        internalColName = ((ExprNodeColumnDesc) 
currentOp.getColumnExprMap().get(internalColName)).getColumn();

Review comment:
       the old code also has similar issues




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