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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>
(cherry picked from commit 47fd3173a5)
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 c1d8ccfb64
commit 9e802f25aa
1 changed files with 1 additions and 1 deletions
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python/pyspark/pandas/data_type_ops/num_ops.py
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@ -16,7 +16,7 @@
#
import numbers
from typing import cast, Any, Union
from typing import Any, Union
import numpy as np
import pandas as pd