Modin 0.5.0 release notes

This release includes many major new features and updates.

Bugfixes + Pandas Concordance (🐛 + 🐼)

• Fix loc with MultiIndex (#508)
• #516 Fix duplicated index in concat (#521)
• read_excel(sheet_name=None) not working (#512) (#532)
• Change how describe excludes columns (#535)
• Add "options" support #291 (#538)
• Correct behavior for read_table when sep=False (#547)
• Fix read_csv when parse_dates and index_col are the same (#548)
• Fix issue where repr was not correct after mapreduce operation (#552)
• Fix reset_index when name field of the index is set (#553)
• Support for arguments not explicity in the signature for read_fwf (#561)
• Add datetime to top level API. issue: #542 (#564)
• Allow concat to accept non-subscriptable objects as keys parameter (#568)
• Fix support for level parameter in groupby (#575)
• Fix numeric_only parameter (#578)
• Set series to dataframe (#545)
• Fix astype with "category" as the type passed (#587)

User experience 👤

• Remove typing dependency (#571)
• Add warning when using the constructor of DataFrame and Series (#572)
• Fix compatibility for Python2 (#606)

New functionality ⭐️

• Add Gandiva as a partition engine for the Ray backend (#489)
• parallel read_sql() using limit and offset (#499)
• Integrate pyarrow's CSV reader into modin (#511)
• Added read_csv support for S3 (#505, #543)
• Distributed Series 🎉 (#522)
• Add parallelism parameter to read_sql() #455 (#594)

Backend enhancements + Performance 🚀

• Add fastrack for empty mask computation (#565)
• Change QueryCompiler.view to use index-based lookup (#566)

Dependencies 🔗

• Move sqlalchemy import statement in experimental io (#498)
• pin pytables version in tests to avoid dependency mismatches (#500)
• Update numpy version to 1.16 (#506)
• Bump pandas version to 0.24.2 (#509)
• Update Ray version to 0.6.6 (#567)

Testing and Code Quality (📈 + 💯)

• Refactor and rename files to be more descriptive (#496)
• Add stress tests for modin (#481)
• Refactor to move all ci related files to ci/ (#479)
• Refactor the QueryCompiler module to separate backends (#510)
• Formatting with black (#527)
• Fix Travis incompatibility (#534)
• Dtype cleanup (#570)

Regressions ↩️

• Fix single-column DataFrame index on MapReduce operations (#580)
• Fix drop after transpose (#582)
• Add support for concat with empty DataFrames and new Series (#584)
• Fix Series.getitem for bool indexers and slices (#591)
• Fix binary operation after transpose (#589)
• Fix indexing on empty_series (#596)
• Correctly compute reindex after a transpose (#600)
• Correctly apply Series functions element-wise for correct cases (#598)
• Fix regression in constructor for lists/dicts of Series (#602)
• Fix dtype checking if other is a scalar (#604)

Contributors this release

The following users contributed code to Modin since the last release.

@ipacheco-uy (First time contributor) 🌟
@pcmoritz (First time contributor) 🌟
@wuisawesome (First time contributor) 🌟
@williamma12 (Committer)
@eavidan (Committer)
@devin-petersohn (Admin)

🎉🎉 Thank you! 🎉🎉