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perf: remove redundant array deepcopy (#26)
* perf(bigquery): remove redundant array deepcopy deepcopy can be a very costly operation when considering large arrays with complex nested objects. refactor helpers to allow recursive conversion without copying arrays. * add check to ignore REPEATED mode * Update google/cloud/bigquery/_helpers.py Co-authored-by: Bu Sun Kim <firstname.lastname@example.org> Co-authored-by: Tres Seaver <email@example.com> Co-authored-by: Tim Swast <firstname.lastname@example.org> Co-authored-by: Bu Sun Kim <email@example.com>
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