RaigorJiang commented on code in PR #27336:
URL: https://github.com/apache/shardingsphere/pull/27336#discussion_r1270205905


##########
features/encrypt/core/src/main/java/org/apache/shardingsphere/encrypt/rewrite/token/generator/EncryptAlterTableTokenGenerator.java:
##########
@@ -134,26 +134,13 @@ private Collection<SQLToken> getModifyColumnTokens(final 
EncryptTable encryptTab
         for (ModifyColumnDefinitionSegment each : segments) {
             String columnName = 
each.getColumnDefinition().getColumnName().getIdentifier().getValue();
             if (encryptTable.isEncryptColumn(columnName)) {
-                
result.addAll(getModifyColumnTokens(encryptTable.getEncryptColumn(columnName), 
each));
+                throw new UnsupportedOperationException("Unsupported operation 
'modify' for the cipher column");

Review Comment:
   Is it better to use ShardingSpherePreconditions?



##########
features/encrypt/core/src/main/java/org/apache/shardingsphere/encrypt/rewrite/token/generator/EncryptAlterTableTokenGenerator.java:
##########
@@ -165,6 +152,10 @@ private Optional<SQLToken> getColumnPositionToken(final 
EncryptTable encryptTabl
     private Collection<SQLToken> getChangeColumnTokens(final EncryptTable 
encryptTable, final Collection<ChangeColumnDefinitionSegment> segments) {
         Collection<SQLToken> result = new LinkedList<>();
         for (ChangeColumnDefinitionSegment each : segments) {
+            String columnName = 
each.getPreviousColumn().getIdentifier().getValue();
+            if (encryptTable.isEncryptColumn(columnName)) {
+                throw new UnsupportedOperationException("Unsupported operation 
'change' for the cipher column");

Review Comment:
   Is it better to use ShardingSpherePreconditions?



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