General functions

Data manipulations

get_dummies(data[, prefix, prefix_sep, …]) Convert categorical variable into dummy/indicator variables, also known as one hot encoding.
sql(query) Execute a SQL query and return the result as a Koalas DataFrame.
concat(objs[, axis, join, ignore_index]) Concatenate pandas objects along a particular axis with optional set logic along the other axes.

Top-level dealing with datetimelike

to_datetime(arg[, errors, format, …]) Convert argument to datetime.

Integration with Spark and pandas

pandas_wraps([function, return_col, …]) This annotation makes a function available for Koalas.
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