@Override
    public String toString() {
      return "Add{"
          + "baseFieldId="
          + baseFieldId
          + ", parent='"
          + parent
          + '\''
          + ", field='"
          + field
          + '\''
          + ", type="
          + type
          + ", doc='"
          + doc
          + '\''
          + '}';
    }
Apply the pending changes to the original schema and returns the result.

<p>This does not result in a permanent update.

@return the result Schema when all pending updates are applied
amoro-format-iceberg/src/main/java/org/apache/amoro/op/KeyedSchemaUpdate.java