Move common parts out of conditional blocks in parseAlterTableAddColumn()

h2/src/main/org/h2/command/Parser.java

@@ -6254,23 +6254,18 @@ public class Parser {
                 columnsToAdd.add(column);
             } while (readIf(","));
             read(")");
-            if (readIf("BEFORE")) {
-                command.setAddBefore(readColumnIdentifier());
-            } else if (readIf("AFTER")) {
-                command.setAddAfter(readColumnIdentifier());
-            }
         } else {
             boolean ifNotExists = readIfNotExists();
             command.setIfNotExists(ifNotExists);
             String columnName = readColumnIdentifier();
             Column column = parseColumnForTable(columnName, true);
             columnsToAdd.add(column);
+        }
         if (readIf("BEFORE")) {
             command.setAddBefore(readColumnIdentifier());
         } else if (readIf("AFTER")) {
             command.setAddAfter(readColumnIdentifier());
         }
-        }
         command.setNewColumns(columnsToAdd);
         return command;
     }