You are viewing a plain text version of this content. The canonical link for it is here.
Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2021/05/18 08:09:37 UTC
[GitHub] [arrow] lf-shaw opened a new issue #10351: [python] Int64Array can not be casted to DoubleArray?
lf-shaw opened a new issue #10351:
URL: https://github.com/apache/arrow/issues/10351
In numpy, we can cast int64 to float64. But in pyarrow, we can't.
```python
import pandas as pd
import pyarrow as pa
# timestamp
dt = pd.date_range('2021-01-01', periods=10)
# int64
arr = dt.asi8
# cast to float64
arr_double = arr.astype(np.float64)
# to arrow array
ts = pa.array(dt.asi8, type=pa.timestamp('ns'))
# to int64 array
ts_int64 = ts.cast(pa.int64())
# cast to float64
ts_double = ts_int64.cast(pa.float64())
```
the last line raise an exception
```python
---------------------------------------------------------------------------
ArrowInvalid Traceback (most recent call last)
<ipython-input-89-cc7cafd418c4> in <module>
----> 1 pa.array(dt.asi8, type=pa.timestamp('ns')).cast(pa.int64()).cast(pa.float64())
/opt/anaconda3/lib/python3.8/site-packages/pyarrow/array.pxi in pyarrow.lib.Array.cast()
/opt/anaconda3/lib/python3.8/site-packages/pyarrow/compute.py in cast(arr, target_type, safe)
287 else:
288 options = CastOptions.unsafe(target_type)
--> 289 return call_function("cast", [arr], options)
290
291
/opt/anaconda3/lib/python3.8/site-packages/pyarrow/_compute.pyx in pyarrow._compute.call_function()
/opt/anaconda3/lib/python3.8/site-packages/pyarrow/_compute.pyx in pyarrow._compute.Function.call()
/opt/anaconda3/lib/python3.8/site-packages/pyarrow/error.pxi in pyarrow.lib.pyarrow_internal_check_status()
/opt/anaconda3/lib/python3.8/site-packages/pyarrow/error.pxi in pyarrow.lib.check_status()
ArrowInvalid: Integer value 1609459200000000000 not in range: -9007199254740992 to 9007199254740992
```
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
users@infra.apache.org
[GitHub] [arrow] lidavidm closed issue #10351: [python] Int64Array can not be casted to DoubleArray?
Posted by GitBox <gi...@apache.org>.
lidavidm closed issue #10351:
URL: https://github.com/apache/arrow/issues/10351
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
users@infra.apache.org
[GitHub] [arrow] lidavidm commented on issue #10351: [python] Int64Array can not be casted to DoubleArray?
Posted by GitBox <gi...@apache.org>.
lidavidm commented on issue #10351:
URL: https://github.com/apache/arrow/issues/10351#issuecomment-843260793
Hey @lf-shaw, I see you also made a JIRA at ARROW-12818 (thanks!) - let's continue the discussion there.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
users@infra.apache.org