GitHub user seancxmao opened a pull request:
https://github.com/apache/spark/pull/22183
[SPARK-25132][SQL][BACKPORT-2.3] Case-insensitive field resolution when
reading from Parquet
## What changes were proposed in this pull request?
This is a backport of https://github.com/apache/spark/pull/22148
Spark SQL returns NULL for a column whose Hive metastore schema and Parquet
schema are in different letter cases, regardless of spark.sql.caseSensitive set
to true or false. This PR aims to add case-insensitive field resolution for
ParquetFileFormat.
* Do case-insensitive resolution only if Spark is in case-insensitive mode.
* Field resolution should fail if there is ambiguity, i.e. more than one
field is matched.
## How was this patch tested?
Unit tests added.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/seancxmao/spark SPARK-25132-2.3
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/22183.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 #22183
----
commit 28315888eaae5a9c9160ea53eb6eb9a9af712958
Author: seancxmao <seancxmao@...>
Date: 2018-08-21T02:34:23Z
[SPARK-25132][SQL][BACKPORT-2.3] Case-insensitive field resolution when
reading from Parquet
----
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
