(db)
| 41 | |
| 42 | |
| 43 | def test_empty(db): |
| 44 | from sqlalchemy import Column, Integer, MetaData, Table, create_engine |
| 45 | |
| 46 | with tmpfile() as f: |
| 47 | uri = f"sqlite:///{f}" |
| 48 | metadata = MetaData() |
| 49 | engine = create_engine(uri) |
| 50 | table = Table( |
| 51 | "empty_table", |
| 52 | metadata, |
| 53 | Column("id", Integer, primary_key=True), |
| 54 | Column("col2", Integer), |
| 55 | ) |
| 56 | metadata.create_all(engine) |
| 57 | |
| 58 | dask_df = read_sql_table(table.name, uri, index_col="id", npartitions=1) |
| 59 | assert dask_df.index.name == "id" |
| 60 | # The dtype of the empty result might no longer be as expected |
| 61 | # assert dask_df.col2.dtype == np.dtype("int64") |
| 62 | pd_dataframe = dask_df.compute() |
| 63 | assert pd_dataframe.empty is True |
| 64 | |
| 65 | |
| 66 | @pytest.mark.filterwarnings( |
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