zabetak commented on code in PR #5978:
URL: https://github.com/apache/hive/pull/5978#discussion_r2218683864


##########
ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveUnionSimpleSelectsToInlineTableRule.java:
##########
@@ -218,6 +218,9 @@ private boolean isInlineTableOperand(RelNode input) {
     if (input.getInputs().size() == 0) {
       return true;
     }
+    if (!(((RexCall)((HiveTableFunctionScan) 
input).getCall()).getOperands().get(0) instanceof RexCall)) {
+      return false;
+    }

Review Comment:
   They are enough to prevent the ClassCastException observed here but not 
sufficient to cover problems with other combinations UDTF as pointed out in 
another comment. Anyways, this is out-of-scope of this PR so marking this 
discussion as resolved. 



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