[jira] [Created] (ARROW-4103) [Documentation] Add README to docs/ root

[Wes McKinney (JIRA)]

Wes McKinney created ARROW-4103:
---

 Summary: [Documentation] Add README to docs/ root
 Key: ARROW-4103
 URL: https://issues.apache.org/jira/browse/ARROW-4103
 Project: Apache Arrow
  Issue Type: Improvement
  Components: Documentation
Reporter: Wes McKinney
 Fix For: 0.12.0


This should direct the user to instructions about how to build the documentation



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[jira] [Created] (ARROW-4102) [C++] FixedSizeBinary identity cast not implemented

[Francois Saint-Jacques (JIRA)]

Francois Saint-Jacques created ARROW-4102:
-

 Summary: [C++] FixedSizeBinary identity cast not implemented
 Key: ARROW-4102
 URL: https://issues.apache.org/jira/browse/ARROW-4102
 Project: Apache Arrow
  Issue Type: Improvement
Reporter: Francois Saint-Jacques
Assignee: Francois Saint-Jacques
 Fix For: 0.12.0






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[jira] [Created] (ARROW-4101) [C++] Binary identity cast not implemented

[Wes McKinney (JIRA)]

Wes McKinney created ARROW-4101:
---

 Summary: [C++] Binary identity cast not implemented
 Key: ARROW-4101
 URL: https://issues.apache.org/jira/browse/ARROW-4101
 Project: Apache Arrow
  Issue Type: Bug
  Components: C++
Reporter: Wes McKinney
 Fix For: 0.12.0


Surfaced by test case in https://github.com/apache/arrow/pull/3239

```
In [1]: import pyarrow as pa

In [2]: pa.array([b'foo'])
Out[2]: 

[
  666F6F
]

In [3]: arr = pa.array([b'foo'])

In [4]: arr.cast(pa.binary())
---
ArrowNotImplementedError  Traceback (most recent call last)
 in ()
> 1 arr.cast(pa.binary())

~/miniconda/envs/arrow-dev/lib/python3.6/site-packages/pyarrow/array.pxi in 
pyarrow.lib.Array.cast()

~/miniconda/envs/arrow-dev/lib/python3.6/site-packages/pyarrow/error.pxi in 
pyarrow.lib.check_status()

ArrowNotImplementedError: No cast implemented from binary to binary
```



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