GitHub user maropu opened a pull request: https://github.com/apache/spark/pull/18356
[SPARK-21144][SQL][BRANCH-2.2] Check column name duplication in read/write paths ## What changes were proposed in this pull request? This pr fixed unexpected results when the data schema and partition schema have the duplicate columns. ``` withTempPath { dir => val basePath = dir.getCanonicalPath spark.range(0, 3).toDF("foo").write.parquet(new Path(basePath, "foo=1").toString) spark.range(0, 3).toDF("foo").write.parquet(new Path(basePath, "foo=a").toString) spark.read.parquet(basePath).show() } +---+ |foo| +---+ | 1| | 1| | a| | a| | 1| | a| +---+ ``` This patch added code to check name duplication when reading from/writing to files. This comes from #17758 to fix this issue for v2.2. ## How was this patch tested? Created a new test suite `SchemaUtilsSuite` and added tests in existing suites: `DataFrameSuite`, `DDLSuite`, `JDBCWriteSuite`, `DataFrameReaderWriterSuite`, `HiveMetastoreCatalog`, and `HiveDDLSuite`. You can merge this pull request into a Git repository by running: $ git pull https://github.com/maropu/spark SPARK-21144-2 Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/18356.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 #18356 ---- commit 32f0130714f41bc8e0d10b5f309905734274415a Author: Takeshi Yamamuro <yamam...@apache.org> Date: 2017-04-25T05:24:48Z Add code to check column name duplication ---- --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org