check_bool_indexer(index: 'Index', key) -> 'np.ndarray'
This function assumes that is_bool_indexer(key) == True.
Index of the object on which the indexing is done.
Boolean indexer to check.
If the key does not have the same length as index.
If the index of the key is unalignable to index.
Resulting key.
Check if key is a valid boolean indexer for an object with such index and perform reindexing or conversion if needed.
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