tree dd22c9447607dc302c097fde0e16e7f69e0f0144
parent b5045ed833aaff35e6c8064ac7d908c19a5f48fa
author Nic Crane <thisisnic@gmail.com> 1618443164 -0700
committer Neal Richardson <neal.p.richardson@gmail.com> 1618443164 -0700

ARROW-11468: [R] Allow user to pass schema to read_json_arrow()

A couple of things I wanted to check are expected behaviour:

1. If I specify in the schema that a numeric column should be a string column, I get the error `Error: Invalid: JSON parse error: Column(/third_col) changed from string to number in row 0`
 (e.g. if I run the following)
```
tf <- tempfile()
writeLines('
    { "hello": 3.5, "world": 2, "third_col": 99}
    { "hello": 3.25, "world": 5, "third_col": 98}
    { "hello": 3.125, "world": 8, "third_col": 97 }
    { "hello": 0.0, "world": 10, "third_col": 96}
', tf)
read_json_arrow(tf, schema = schema(third_col = utf8(), world = float64()))
```
2. As can be seen in the tests output (will delete the `print` statements before this is merged), table columns are returned in the order specified in the schema and then the columns not mentioned in the schema.

Closes #9950 from thisisnic/ARROW-11468

Authored-by: Nic Crane <thisisnic@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>