Add docstring examples for Aggregate window functions#1418
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ntjohnson1 wants to merge 1 commit intoapache:mainfrom
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Add docstring examples for Aggregate window functions#1418ntjohnson1 wants to merge 1 commit intoapache:mainfrom
ntjohnson1 wants to merge 1 commit intoapache:mainfrom
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Add example usage to docstrings for Aggregate window functions to improve documentation. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
kosiew
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Mar 13, 2026
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@ntjohnson1
Thanks for working on this.
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| df.aggregate([], first_value(col("a"), order_by="ts")) | ||
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| Examples: | ||
| --------- | ||
| >>> ctx = dfn.SessionContext() | ||
| >>> df = ctx.from_pydict({"a": [10, 20, 30]}) | ||
| >>> result = df.aggregate([], [dfn.functions.first_value(dfn.col("a")).alias("v")]) |
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2518: df.aggregate([], expr)
2524: ...df.aggregate([], [expr])
Mixing both forms inside the same docstring makes the API shape feel less crisp than it could be.
Same observation for first_value, last_value, and nth_value
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| >>> import builtins | ||
| >>> result = df.select( | ||
| ... dfn.col("a"), | ||
| ... dfn.functions.cume_dist( | ||
| ... order_by="a" | ||
| ... ).alias("cd") | ||
| ... ) | ||
| >>> [builtins.round(x, 4) for x in | ||
| ... result.sort(dfn.col("a") | ||
| ... ).collect_column("cd").to_pylist()] | ||
| [0.6667, 0.6667, 1.0] |
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I think this would be a simpler example without builtin:
>>> ctx = dfn.SessionContext()
>>> df = ctx.from_pydict({"a": [1, 2, 2, 3]})
>>> result = df.select(cume_dist(col("a"))).collect()[0]
>>> rounded = [round(x, 2) for x in result.column(0)]
>>> rounded
[0.25, 0.75, 0.75, 1.0]
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Which issue does this PR close?
Rationale for this change
Add example usage to docstrings for Aggregate window functions to improve documentation.
What changes are included in this PR?
The first PR was basically adding a docstring to everything in functions. I broke it apart into a PR (that already merged) for the infra. I then reviewed and merged an example PR of adding the docstrings in parts. This is now the follow up opening a handful of PRs for the remaining functions in functions.py Everything is co-authored with Claude since I used claude to extend the handwritten examples I wrote for reference and to split apart the large PR rather than doing it manually.
I've reviewed all the code prior to PR.
Are there any user-facing changes?
No