#1937 - When add a new col with @DbComment in Entity,the DbMigration does not generate comment ddl

src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/BaseTableDdl.java

@@ -951,6 +951,10 @@ public class BaseTableDdl implements TableDdl {
     }
 
     platformDdl.alterTableAddColumn(buffer, tableName, column, onHistoryTable, help.getDefaultValue());
+    final String comment = column.getComment();
+    if (comment != null && !comment.isEmpty()) {
+      platformDdl.addColumnComment(buffer, tableName, column.getName(), comment);
+    }
 
     if (!onHistoryTable) {
       help.writeAfter(buffer);

src/test/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/BaseTableDdlTest.java

@@ -19,6 +19,7 @@ import java.io.IOException;
 import java.util.List;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.assertEquals;
 
 
 public class BaseTableDdlTest {
@@ -98,6 +99,21 @@ public class BaseTableDdlTest {
     assertThat(ddl).contains("comment on column mytab.acol is 'my comment'");
   }
 
+  @Test
+  public void alterTableAddColumnWithComment() throws IOException {
+    BaseTableDdl ddl = new BaseTableDdl(serverConfig, h2ddl);
+    DdlWrite write = new DdlWrite();
+    Column column = new Column();
+    column.setName("my_column");
+    column.setComment("some comment");
+    column.setType("int");
+
+    ddl.alterTableAddColumn(write.apply(), "my_table", column, false, false);
+    assertEquals(
+      "alter table my_table add column my_column int;\n" +
+      "comment on column my_table.my_column is 'some comment';\n", write.apply().getBuffer());
+  }
+
   @Test
   public void testAddTableComment() throws IOException {