@Override
    public boolean evaluateLabel(ArrayView matchedLabels) {
      int position = matchedLabels.length() - 1;
      return input[position] == matchedLabels.get(position);
    }
Determines whether identifying the current row as `label` is valid, where the `label` is the
last pattern variable in matchedLabels.

<p>In the Test, each row has an explicit label, i.e., input[position]. Therefore, it only
needs to check whether input[position] equals the label. In the actual matching process of
`evaluateLabel`, it is necessary to determine whether the current row can be recognized as
the label based on the definition of the label in the DEFINE clause.
iotdb-core/datanode/src/test/java/org/apache/iotdb/db/queryengine/execution/operator/process/rowpattern/MatcherTest.java