Major Description
TableInputFormatBase class offers users a mechanism to exclude specific splits from returned list of TableInputFormatBase#getSplits through TableInputFormatBase#includeRegionInSplit.
It also offers users a feature called "auto balancing" to mitigate data skew by splitting large splits and merging small splits.
If a user overrides TableInputFormatBase#includeRegionInSplit, i th split and i+1 th split may not be successive(i th split's end key is smaller than i+1 th split's start key).
If he or she further enable auto balancing feature, non-successive splits can be merged, which means excluded splits between merged non-successive splits "revive".
To avoid such cases, we should not merge non-successive splits.