Parquet files invalid #51
Description
I get errors reading the Parquet files produced by Sherlock when using certain other tools to read them. It turns out that some of the characters used are invalid as part of a column name. Perhaps character features could simply use their ASCII value instead of the character itself?
KeyError: "['n_[^]-agg-skewness', 'n_[\\\\]-agg-all', 'n_[\\\\]-agg-max', 'n_[\\\\]-agg-mean', 'n_[^]-agg-median', 'n_[\\\\]-agg-var', 'n_[^]-agg-all', 'n_[^]-agg-sum', 'n_[\\\\]-agg-median', 'n_[^]-agg-mean', 'n_[^]-agg-any', 'n_[\\\\]-agg-min', 'n_[^]-agg-min', 'n_[\\\\]-agg-any', 'n_[^]-agg-max', 'n_[\\\\]-agg-skewness', 'n_[\\\\]-agg-sum', 'n_[\\\\]-agg-kurtosis', 'n_[^]-agg-var', 'n_[^]-agg-kurtosis'] not in index"