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Romain FrancoisWes McKinney
8c52f4c659e
Romain Francois authored and Wes McKinney committed 72817313a65
ARROW-3741: [R] Add support for arrow::compute::Cast to convert Arrow arrays from one type to anothe

``` r
library(arrow)
a <- array(1:10, NA)
a$type()
#> arrow::Int32
#> int32

b <- a$cast(int16())
b$type()
#> arrow::Int16
#> int16
```

<sup>Created on 2018-11-14 by the [reprex package](https://reprex.tidyverse.org) (v0.2.1.9000)</sup>

Author: Romain Francois <romain@purrple.cat>

Closes #2959 from romainfrancois/ARROW-3741/Cast and squashes the following commits:

053bd3540 <Romain Francois> provision test for cast to half float
085886b20 <Romain Francois> fix similar to @javierluraschi fix on #2955
05f87580f <Romain Francois> Table$cast(schema)
f02e74476 <Romain Francois> RecordBatch$cast(schema)
7cb78ca36 <Romain Francois> ChunkedArray$cast()
26ef53889 <Romain Francois> expose Schema$names as an active
d41423b37 <Romain Francois> making STOP_IF_NULL an inline function so that it is only used on pointers.
ffa8c7c4a <Romain Francois> + tests
a96defacd <Romain Francois> testing the right thing in `STOP_IF_NULL`, same as https://github.com/apache/arrow/pull/2953/commits/e8a7b233028f265572dbef1793e33b9c86fd5721 from #2953
70898ed8a <Romain Francois> Array$cast