docs: create sample notebook to manipulate struct and array data

[chelsea-lin]

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Fixes internal bug: 357587135 🦕

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[tswast]

Line #2. adj_scores_arr = bbq.array_agg(adj_scores.groupby(level=0))

Could we add a note about ordering? Is the original order preserved? If so, under what conditions?

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[chelsea-lin]

Added some comments in the code. Please help to double check.

[tswast]

Line #2. df['NewScores'] = adj_scores_arr

Should we call out that the index needs to be unique? My understanding is that this will do a real JOIN in the SQL, so duplicate keys in the index might cause unexpected results.

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[chelsea-lin]

Your understanding is correct. Added more comments in the code. Please double check.

[tswast]

Thanks!

[tswast]

Kokoro notebook failure: FAILED notebooks/dataframes/pypi.ipynb:: - RelationError: Table schemas must be equal for set operations. I believe this is internal issue 361145903.