GitHub user xwu0226 opened a pull request:
https://github.com/apache/spark/pull/14509
[SPARK-16924][SQL] - Support option("inferSchema", true) option for
DataStreamReadder
## What changes were proposed in this pull request?
The issue is that `DataSource.sourceSchema()` has a check against only the
SQLConf setting `spark.sql.streaming.schemaInference`, which is only set at the
Session level. So even though the user specify `option("inferSchema", true)` as
they would usually do for `DataFrameReader` for csv/json file,
DataSource.sourceSchema() does not know. and this option is not passed down to
`CSVFileFormat.inferSchema`.
This PR is to combine the checking of both the value of
`spark.sql.streaming.schemaInference` and the `option("inferSchema")`.
## How was this patch tested?
New unit test added to test creating streaming DataSet with
`option("inferSchema", true)`
And ran the regression buckets.
(If this patch involves UI changes, please attach a screenshot; otherwise,
remove this)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/xwu0226/spark INFERSCHEMA_OPTION
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/14509.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 #14509
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commit 8692d1ca2d0e685dc752e9996637cd1189043557
Author: Xin Wu <[email protected]>
Date: 2016-08-05T18:52:54Z
Support option("inferSchema", true) option for DataStreamReadder
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