GitHub user HyukjinKwon opened a pull request:
https://github.com/apache/spark/pull/18431
[SPARK-21208][R] Specify a schema by using a DDL-formatted string when
reading in R
## What changes were proposed in this pull request?
This PR proposes to support a DDL-formetted string as schema as below:
```r
mockLines <- c("{\"name\":\"Michael\"}",
"{\"name\":\"Andy\", \"age\":30}",
"{\"name\":\"Justin\", \"age\":19}")
jsonPath <- tempfile(pattern = "sparkr-test", fileext = ".tmp")
writeLines(mockLines, jsonPath)
df <- read.df(jsonPath, "json", "name STRING, age DOUBLE")
collect(df)
```
## How was this patch tested?
Tests added in `test_streaming.R` and `test_sparkSQL.R` and manual tests.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/HyukjinKwon/spark r-ddl-schema
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/18431.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #18431
----
commit 3b21231b897bbbb0f16086b202a2ed6ebbe29355
Author: hyukjinkwon <[email protected]>
Date: 2017-06-27T07:44:56Z
Specify a schema by using a DDL-formatted string when reading
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