Fix Column.validateConvertUpdateSequence() for ENUM data type

h2/src/main/org/h2/table/Column.java

@@ -334,11 +334,12 @@ public class Column {
         synchronized (this) {
             localDefaultExpression = defaultExpression;
         }
+        Mode mode = session.getDatabase().getMode();
         if (value == null) {
             if (localDefaultExpression == null) {
                 value = ValueNull.INSTANCE;
             } else {
-                value = localDefaultExpression.getValue(session).convertTo(type);
+                value = convert(localDefaultExpression.getValue(session), mode);
                 if (!localDefaultExpression.isConstant()) {
                     session.getGeneratedKeys().add(this);
                 }
@@ -347,10 +348,9 @@ public class Column {
                 }
             }
         }
-        Mode mode = session.getDatabase().getMode();
         if (value == ValueNull.INSTANCE) {
             if (convertNullToDefault) {
-                value = localDefaultExpression.getValue(session).convertTo(type);
+                value = convert(localDefaultExpression.getValue(session), mode);
                 if (!localDefaultExpression.isConstant()) {
                     session.getGeneratedKeys().add(this);
                 }

h2/src/test/org/h2/test/scripts/datatypes/enum.sql

@@ -162,3 +162,26 @@ drop table card;
 drop type CARD_SUIT;
 > ok
 
+CREATE TABLE TEST(ID INT, E1 ENUM('A', 'B') DEFAULT 'A', E2 ENUM('C', 'D') DEFAULT 'C' ON UPDATE 'D');
+> ok
+
+INSERT INTO TEST(ID) VALUES (1);
+> update count: 1
+
+SELECT * FROM TEST;
+> ID E1 E2
+> -- -- --
+> 1  A  C
+> rows: 1
+
+UPDATE TEST SET E1 = 'B';
+> update count: 1
+
+SELECT * FROM TEST;
+> ID E1 E2
+> -- -- --
+> 1  B  D
+> rows: 1
+
+DROP TABLE TEST;
+> ok