adding explode

[Graciaaa3]

Change Description

Added the explode() function extension to work for nested structure. In addition to regular explode on the base columns, the extension includes "unnesting" single nested column by expanding it.

• My PR includes a link to the issue that I am addressing

Solution Description

Extending the explode function to work for nested frame.

Currently, the function only support single nested column explosion. If the given column includes multiple nested columns or includes a mix of nested column and base column, an ValueError will be raised. The exploded nest columns will be added to the right of the rest of the frame with a join. Nested column names are prefixed with <nested_col>. for clarity.

Apply the super().explode() on base columns for regular pandas' explode.

Code Quality

• I have read the Contribution Guide
• My code follows the code style of this project
• My code builds (or compiles) cleanly without any errors or warnings
• My code contains relevant comments and necessary documentation

Project-Specific Pull Request Checklists

New Feature Checklist

• I have added or updated the docstrings associated with my feature using the NumPy docstring format
• I have updated the tutorial to highlight my new feature (if appropriate)
• I have added unit/End-to-End (E2E) test cases to cover my new feature
• My change includes a breaking change
  • My change includes backwards compatibility and deprecation warnings (if possible)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.10%. Comparing base (f28da17) to head (1a356a2).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #327      +/-   ##
==========================================
+ Coverage   98.08%   98.10%   +0.02%     
==========================================
  Files          18       18              
  Lines        1722     1742      +20     
==========================================
+ Hits         1689     1709      +20     
  Misses         33       33              

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[github-actions]

Before [4186d56] <v0.4.8>	After [6726d82]	Ratio	Benchmark (Parameter)
898M	1.02G	1.13	benchmarks.ReadFewColumnsS3.peakmem_run
10.8±0.2ms	11.5±0.3ms	1.07	benchmarks.NestedFrameAddNested.time_run
32.4±0.4ms	33.5±1ms	1.03	benchmarks.AssignSingleDfToNestedSeries.time_run
250M	249M	1	benchmarks.AssignSingleDfToNestedSeries.peakmem_run
135M	135M	1	benchmarks.CountNestedBy.peakmem_run
102M	102M	1	benchmarks.NestedFrameAddNested.peakmem_run
107M	106M	1	benchmarks.NestedFrameQuery.peakmem_run
10.2±0.05ms	10.3±0.1ms	1	benchmarks.NestedFrameQuery.time_run
105M	105M	1	benchmarks.NestedFrameReduce.peakmem_run
2.73±0.04s	2.72±0.03s	1	benchmarks.ReadFewColumnsHTTPS.time_run

Click here to view all benchmarks.

[dougbrn]

Looks good, just two requests!

[dougbrn]

Looks great!

[gitosaurus]

Looks great! Only minor suggestions on wording in the docstring.