Miscellaneous

DataFrame.corr(**kwargs)	Return pairwise Pearson product-moment correlation coefficients between columns.
DataFrame.equals(other, *[, null_equal])	Check whether the DataFrame is equal to another DataFrame.
DataFrame.lazy()	Start a lazy query from this point.
DataFrame.map_rows(function[, return_dtype, ...])	Apply a custom/user-defined function (UDF) over the rows of the DataFrame.

Serialization

DataFrame.deserialize(source)	Read a serialized DataFrame from a file.
DataFrame.serialize([file])	Serialize this DataFrame to a file or string in JSON format.