a data frame.
Returns a new DataFrame without given column indices.
Tests if a predicate holds for at least one row of data frame.
Selects all rows which satisfy a predicate.
Finds the first row satisfying a predicate.
Tests if a predicate holds for all rows of data frame.
Applies a function for its side-effect to every row.
Partitions the DataFrame into a map of DataFrames according to some discriminator function.
the type of keys returned by the discriminator function.
the discriminator function.
A map from keys to DataFrames
Builds a new data collection by applying a function to all rows.
Returns a new data frame with row indexing.
Partitions this DataFrame in two according to a predicate.
the predicate on which to partition.
a pair of DataFrames: the first DataFrame consists of all elements that
satisfy the predicate
p and the second DataFrame consists of all elements
that don't. The relative order of the elements in the resulting DataFramess
is the same as in the original DataFrame.
Selects a new DataFrame with given column indices.
Converts the tuple to a JSON array.