feat: Add bigframes.bigquery.rand() function #2391
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This change adds `bigframes.bigquery.rand()` which wraps the BigQuery `RAND()` function. It accepts a Series or DataFrame as input to determine the shape and index of the output Series. It includes a warning about non-determinism in the docstring. Tests are added in `tests/unit/bigquery/test_mathematical.py` and `tests/system/small/bigquery/test_mathematical.py`.
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This change adds `bigframes.bigquery.rand()` which wraps the BigQuery `RAND()` function. It accepts a Series or DataFrame as input to determine the shape and index of the output Series. It includes a warning about non-determinism in the docstring. Additionally, `SqlScalarOp` has been updated to accept an `is_deterministic` argument, which is set to `False` for `rand()`. Tests are added in `tests/unit/bigquery/test_mathematical.py` and `tests/system/small/bigquery/test_mathematical.py`.
Added
bigframes.bigquery.rand()function tobigframes/bigquery/_operations/mathematical.pyand exposed it inbigframes/bigquery/__init__.py.The function generates random float values in [0, 1).
Added unit tests and system tests.
PR created automatically by Jules for task 2516630488154236828 started by @tswast