public static MatchTracker create(int logicalHashBucketCount) {
    return new MatchTracker(false, null, logicalHashBucketCount);
  }
Record which hash table slot entries had key matches for FULL OUTER MapJoin.
Supports partitioned match trackers for HybridHashTableContainer.
ql/src/java/org/apache/hadoop/hive/ql/exec/persistence/MatchTracker.java