[GitHub] [calcite] julianhyde commented on a change in pull request #2312: [CALCITE-4265] Improve error message when CAST to unknown type (Louis…

[GitBox <gi...@apache.org>]

julianhyde commented on a change in pull request #2312:
URL: https://github.com/apache/calcite/pull/2312#discussion_r552969406



##########
File path: core/src/main/java/org/apache/calcite/sql/fun/SqlCastFunction.java
##########
@@ -93,6 +95,29 @@ public SqlCastFunction() {
 
   //~ Methods ----------------------------------------------------------------
 
+  @Override public void validateCall(final SqlCall call, final SqlValidator validator,
+      final SqlValidatorScope scope,
+      final SqlValidatorScope operandScope) {
+    try {
+      super.validateCall(call, validator, scope, operandScope);
+    } catch (UnsupportedOperationException ex) {
+      assert call.operandCount() == 2;
+      throw validator.newValidationError(call,
+          RESOURCE.cannotCastToType(call.operand(1).toString()));

Review comment:
       no




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