Version 0.17.0

Options

We started using options to configure the Koalas' behavior. Now we have the following options:

• display.max_rows (#714, #742)
• compute.max_rows (#721, #736)
• compute.shortcut_limit (#717)
• compute.ops_on_diff_frames (#725)
• compute.default_index_type (#723)
• plotting.max_rows (#728)
• plotting.sample_ratio (#737)

We can also see the list and their descriptions in the User Guide of our project docs.

Plots

We continue adding plot APIs as follows:

For Series:

• plot.area() (#704)

For DataFrame:

• plot.line() (#686)
• plot.bar() (#695)
• plot.barh() (#698)
• plot.pie() (#703)
• plot.area() (#696)
• plot.scatter() (#719)

Multi-index columns support

We also continue improving multi-index columns support. We made the following APIs support multi-index columns:

• koalas.concat() (#680)
• koalas.get_dummies() (#695)
• DataFrame.pivot_table() (#635)

Other new features and improvements

We added the following new features:

koalas:

• read_sql_table() (#741)
• read_sql_query() (#741)
• read_sql() (#741)

koalas.DataFrame:

• style (#712)

Along with the following improvements:

• GroupBy.apply should return Koalas DataFrame instead of pandas DataFrame (#731)
• Fix rpow and rfloordiv to use proper operators in Series (#735)
• Fix rpow and rfloordiv to use proper operators in DataFrame (#740)
• Add schema inference support at DataFrame.transform (#732)
• Add Option class to support type check and value check in options (#739)
• Added missing tests (#687, #692, #694, #709, #711, #730, #729, #733, #734)

Backward compatibility

• We renamed two of the default index names from one-by-one and distributed-one-by-one to sequence and distributed-sequence respectively. (#679)
• We moved the configuration for enabling operations on different DataFrames from the environment variable to the option. (#725)
• We moved the configuration for the default index from the environment variable to the option. (#723)