@Override
  public boolean needSkipInAdvance() {
    return true;
  }
skipPointsOutOfBound has two phrases in ConditionWindowManager. First phrase is to skip the row
with the controlColumn of true in current window, which usually happens when FIRST_VALUE() or
MAX_TIME() leaves early in aggregator. Second phrase is to skip the row with the controlColumn
of false/null which don't belong to current window. isFirstSkip is used to identify the phrase.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/operator/window/ConditionWindowManager.java