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[SPARK-36104][PYTHON][FOLLOWUP] Remove unused import "typing.cast"

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### What changes were proposed in this pull request?

This is a followup PR for SPARK-36104 (#33307) and removes unused import `typing.cast`.
After that change, Python linter fails.
```
   ./dev/lint-python
  shell: sh -e {0}
  env:
    LC_ALL: C.UTF-8
    LANG: C.UTF-8
    pythonLocation: /__t/Python/3.6.13/x64
    LD_LIBRARY_PATH: /__t/Python/3.6.13/x64/lib
starting python compilation test...
python compilation succeeded.

starting black test...
black checks passed.

starting pycodestyle test...
pycodestyle checks passed.

starting flake8 test...
flake8 checks failed:
./python/pyspark/pandas/data_type_ops/num_ops.py:19:1: F401 'typing.cast' imported but unused
from typing import cast, Any, Union
^
1     F401 'typing.cast' imported but unused
```

### Why are the changes needed?

To recover CI.

### Does this PR introduce _any_ user-facing change?

No.

### How was this patch tested?

CI.

Closes #33315 from sarutak/followup-SPARK-36104.

Authored-by: Kousuke Saruta <sarutak@oss.nttdata.com>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>
This commit is contained in:
Kousuke Saruta 2021-07-13 13:13:35 +09:00 committed by Hyukjin Kwon
parent ae6199af44
commit 47fd3173a5
1 changed files with 1 additions and 1 deletions
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2
python/pyspark/pandas/data_type_ops/num_ops.py
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@ -16,7 +16,7 @@
# #
import numbers import numbers
from typing import cast, Any, Union from typing import Any, Union
import numpy as np import numpy as np
import pandas as pd import pandas as pd