private BatchActivateTemplateStatement getTemplateBatchStatement() {
    final BatchActivateTemplateStatement batchActivateTemplateStatement =
        new BatchActivateTemplateStatement(
            activateTemplateStatements.stream()
                .map(ActivateTemplateStatement::getPath)
                .collect(Collectors.toList()));
    activateTemplateStatements.clear();
    return batchActivateTemplateStatement;
  }
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