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[ARCHIVED] C GPU DataFrame Library

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Implemented so far is the first implementation concept using nested templating. It has been implemented with support for literals and 14 different binary operators. We would like feedback on the...

4 - Needs Rework
migrate to cudf

API proposal for the replace function.

4 - Needs Rework
migrate to cudf

Following the discussion on [issue 138](https://github.com/rapidsai/libgdf/issues/138), here's a hopefully-template-compliant PR adding documentation to some API functions and data types (not all of them). There are other some minor tweaks such...

4 - Needs Rework
migrate to cudf

Starting to add Doxygen style comments to code.

? - Needs Triage
migrate to cudf

This pull request is ontop of the parquet-reader branch pull request. It uses the same APIs, but it will read all column and rowgroups in parallel using a number of...

4 - Needs Rework
migrate to cudf

This PR adds support for NULL values to the hash-based groupby implementation. The `build_aggregation_table` kernel was updated such that if a row is invalid, then it is not inserted into...

3 - Ready for Review
depends on pygdf
migrate to cudf