pengzhiwei2018 commented on a change in pull request #1138: [CALCITE-1581] UDTF 
like in hive
URL: https://github.com/apache/calcite/pull/1138#discussion_r315488725
 
 

 ##########
 File path: core/src/main/java/org/apache/calcite/sql/SqlAsOperator.java
 ##########
 @@ -102,12 +103,26 @@ public void validateCall(
     // we don't want to validate the identifier.
     final List<SqlNode> operands = call.getOperandList();
     assert operands.size() == 2;
-    assert operands.get(1) instanceof SqlIdentifier;
     operands.get(0).validateExpr(validator, scope);
-    SqlIdentifier id = (SqlIdentifier) operands.get(1);
-    if (!id.isSimple()) {
-      throw validator.newValidationError(id,
-          RESOURCE.aliasMustBeSimpleIdentifier());
+
+    SqlNode asIdentifier = operands.get(1);
+    assert asIdentifier instanceof SqlIdentifier
+        || (asIdentifier instanceof SqlNodeList
+            && validator.getConformance().allowSelectTableFunction());
+
 
 Review comment:
   Thank @julianhyde . There is a test case in `SqlParserTest` for this 
exception.

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