@Override
  public <R, C> R accept(StatementVisitor<R, C> visitor, C context) {
    return visitor.visitAlterTimeSeries(this, context);
  }
Used when the alterType is UPSERT.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/statement/metadata/AlterTimeSeriesStatement.java