@Override
  public Optional<Statement> visitCreateAlignedTimeseries(
      final CreateAlignedTimeSeriesStatement statement, final Void context) {
    createAlignedTimeSeriesStatements.add(statement);
    return createTimeSeriesStatements.size() + createAlignedTimeSeriesStatements.size()
            >= MAX_SCHEMA_BATCH_SIZE
        ? Optional.of(getTimeSeriesBatchStatement())
        : Optional.empty();
  }
This visitor will convert {@link Statement}s to batch and is stateful, and can only be used in a
single thread. It only guarantees the correctness when is used by the schema snapshot and shall
not be used for other purposes.

<p>When the visitor is called, it shall encounter no:

<p>1. {@link StatementNode}s other than {@link Statement}s

<p>2. TimeSeries with identical path.

<p>3. Alter to the timeSeries and templates in batch.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/pipe/receiver/visitor/PipeTreeStatementToBatchVisitor.java