/guava/guava/src/com/google/common/collect/TreeBasedTable.java
wholeRow = false;
wholeRow = null;
} @Override void maintainEmptyInvariant() { updateWholeRowField(); if (wholeRow != null && wholeRow.isEmpty()) { backingMap.remove(rowKey); <extra_id_0> backingRowMap = null; } } @Override public boolean containsKey(@CheckForNull Object key) { return rangeContains(key) && super.containsKey(key);