| commit | 02306277bfacaece652ba76025a6f82def9570b6 | [log] [tgz] |
|---|---|---|
| author | Paul Rogers <par0328@yahoo.com> | Sun Nov 10 16:17:49 2019 -0800 |
| committer | Arina Ielchiieva <arina.yelchiyeva@gmail.com> | Wed Nov 20 12:06:09 2019 +0200 |
| tree | deae0022aa14def9eca5c06d0bd9e22a5ea09474 | |
| parent | 5b9380e54d9487b2db21b52dc60a21317b127146 [diff] |
DRILL-7445: Create batch copier based on result set framework The result set framework now provides both a reader and writer. This PR provides a copier that copies batches using this framework. Such a copier can: - Copy selected records - Copy all records, such as for an SV2 or SV4 The copier uses the result set loader to create uniformly-sized output batches from input batches of any size. It does this by merging or splitting input batches as needed. Since the result set reader handles both SV2 and SV4s, the copier can filter or reorder rows based on the SV associated with the input batch. This version assumes single stream of input batches, and handles any schema changes in that input by creating output batches that track the input schema. This would be used in, say, the selection vector remover. A different design is needed for merging such as in the merging receiver. Adds a "copy" method to the column writers. Copy is implemented by doing a direct memory copy from source to destination vectors. A unit test verifies functionality for various use cases and data types. closes #1899
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