public List<Optional<Statement>> getRemainBatches() {
    return Arrays.asList(
        !(createTimeSeriesStatements.isEmpty() && createAlignedTimeSeriesStatements.isEmpty())
            ? Optional.of(getTimeSeriesBatchStatement())
            : Optional.empty(),
        !activateTemplateStatements.isEmpty()
            ? Optional.of(getTemplateBatchStatement())
            : 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