chunweilei commented on a change in pull request #2224:
URL: https://github.com/apache/calcite/pull/2224#discussion_r507569675



##########
File path: core/src/main/java/org/apache/calcite/plan/RelOptUtil.java
##########
@@ -2199,13 +2199,49 @@ public static boolean equal(
       RelDataType type2,
       Litmus litmus) {
     if (!areRowTypesEqual(type1, type2, false)) {
-      return litmus.fail("Type mismatch:\n{}:\n{}\n{}:\n{}",
+      return litmus.fail("Type mismatch:\n{}:\n{}\n{}:\n{}\ndifference:\n{}",
           desc1, type1.getFullTypeString(),
-          desc2, type2.getFullTypeString());
+          desc2, type2.getFullTypeString(),
+          getFullTypeDifferenceString(type1, type2));
     }
     return litmus.succeed();
   }
 
+  public static String getFullTypeDifferenceString(RelDataType other,
+      RelDataType another) {
+    if (other == another) {
+      return "";
+    }
+
+    if (other.getFieldCount() != another.getFieldCount()) {
+      return "Type mismatch: the field size is not equal,"
+         + " one is " + other.getFieldCount()
+         + ", another one is " + another.getFieldCount();
+    }

Review comment:
       Good idea.




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