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[SPARK-21778][SQL] Simpler Dataset.sample API in Scala / Java #18988

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rxin
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@rxin rxin commented Aug 18, 2017

What changes were proposed in this pull request?

Dataset.sample requires a boolean flag withReplacement as the first argument. However, most of the time users simply want to sample some records without replacement. This ticket introduces a new sample function that simply takes in the fraction and seed.

How was this patch tested?

Tested manually. Not sure yet if we should add a test case for just this wrapper ...

@mengxr
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mengxr commented Aug 18, 2017

LGTM

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SparkQA commented Aug 18, 2017

Test build #80824 has finished for PR 18988 at commit a21d8b0.

  • This patch fails due to an unknown error code, -9.
  • This patch merges cleanly.
  • This patch adds no public classes.

@HyukjinKwon
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retest this please

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SparkQA commented Aug 18, 2017

Test build #80831 has finished for PR 18988 at commit a21d8b0.

  • This patch fails SparkR unit tests.
  • This patch merges cleanly.
  • This patch adds no public classes.

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retest this please

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@dongjoon-hyun dongjoon-hyun left a comment

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+1, LGTM, too.

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SparkQA commented Aug 18, 2017

Test build #80836 has finished for PR 18988 at commit a21d8b0.

  • This patch fails PySpark unit tests.
  • This patch merges cleanly.
  • This patch adds no public classes.

@HyukjinKwon
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retest this please

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SparkQA commented Aug 18, 2017

Test build #80844 has finished for PR 18988 at commit a21d8b0.

  • This patch passes all tests.
  • This patch merges cleanly.
  • This patch adds no public classes.

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LGTM too.

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Merged to master.

I am hitting network issue. Will update the JIRA manually later.

@asfgit asfgit closed this in 07a2b87 Aug 18, 2017
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rxin commented Aug 18, 2017

Thanks. Do you want to add the Python and R ones?

It is a little bit tricky because in Python we would need to detect whether withReplacement is a boolean or a floating point value. If it is a floating point value then we should treat it as the fraction. We better add a test there given the complexity ...

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Yes.. I checked that too. Sure, let me give a try!

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5 participants