[GitHub] [calcite] danny0405 commented on a change in pull request #1374: [CALCITE-3138] Restructuring ROW type fields is not supported

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danny0405 commented on a change in pull request #1374: [CALCITE-3138] Restructuring ROW type fields is not supported
URL: https://github.com/apache/calcite/pull/1374#discussion_r314170313
 
 

 ##########
 File path: core/src/main/java/org/apache/calcite/sql/fun/SqlItemOperator.java
 ##########
 @@ -125,6 +128,14 @@ private SqlSingleOperandTypeChecker getChecker(SqlCallBinding callBinding) {
     case MAP:
       return typeFactory.createTypeWithNullability(operandType.getValueType(),
           true);
+    case ROW:
+      int lastOperandIdx = opBinding.getOperandCount() - 1;
+      String fieldName = opBinding.getOperandLiteralValue(lastOperandIdx, String.class);
+      return operandType.getFieldList().stream()
+          .filter(field -> field.getName().equalsIgnoreCase(fieldName))
+          .findFirst().map(RelDataTypeField::getType)
 
 Review comment:
   You can get the `NameMatcher` from `CatalogReader` of `SqlValidator` to decide the case sensitivity.

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