public long getCapacity() {
    return capacity;
  }
Ensures this big array is at least the specified length. If the array is smaller, segments are
added until the array is larger then the specified length.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/operator/source/relational/aggregation/grouped/array/BooleanBigArray.java