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Expose DataFrame.Transform #688

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Merged
merged 2 commits into from
Sep 25, 2020
Merged

Expose DataFrame.Transform #688

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4cacfd3
initial commit
suhsteve Sep 25, 2020
605be13
Merge branch 'master' into dataframe_transform
imback82 Sep 25, 2020
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2 changes: 2 additions & 0 deletions src/csharp/Microsoft.Spark.E2ETest/IpcTests/Sql/DataFrameTests.cs
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Expand Up @@ -628,6 +628,8 @@ public void TestSignaturesV2_3_X()

Assert.IsType<Row>(_df.First());

Assert.IsType<DataFrame>(_df.Transform(df => df.Drop("age")));

Assert.IsType<Row[]>(_df.Take(3).ToArray());

Assert.IsType<Row[]>(_df.Collect().ToArray());
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9 changes: 9 additions & 0 deletions src/csharp/Microsoft.Spark/Sql/DataFrame.cs
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Expand Up @@ -750,6 +750,15 @@ public DataFrame Summary(params string[] statistics) =>
/// <returns>First row</returns>
public Row First() => Head();

/// <summary>
/// Concise syntax for chaining custom transformations.
/// </summary>
/// <param name="func">
/// A function that takes and returns a <see cref="DataFrame"/>
/// </param>
/// <returns>Transformed DataFrame object.</returns>
public DataFrame Transform(Func<DataFrame, DataFrame> func) => func(this);

/// <summary>
/// Returns the first `n` rows in the `DataFrame`.
/// </summary>
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