Can get a DDF by sampling a Spark DDF by size

nhanitvn commented 8 years ago

Description and related tickets, documents

Also:

The resulted DDF has exact 'size' number of rows
Sample by fraction now return exact number of rows as specified by fraction
The old sample by fraction is renamed to indicate that the result is approximated.

Reviewers: @Huandao0812 @phvu @hai-adatao

Breaking changes & backward compatible issues

No breaking changes in API. However, we need to take care about performance.

How to test

Describe how this PR is tested. In case manual testing is required, describe how to do so.

PR Progress

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Change-Id: I853d48575247d9179936d2a8c67ae79035ccb959

nhanitvn commented 8 years ago

The change on API names leads to a lot of changes in ddf-jdbc and PE. So I will close this ticket and open another one focusing on just the logic, not name changes.

nhanitvn commented 8 years ago

Here it is https://github.com/ddf-project/DDF/pull/328

ddf-project / DDF