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[SPARK-26293] Cast exception when having python udf in subquery - Spark - [issue]
http://issues.apache.org/jira/browse/SPARK-26293    Author: Wenchen Fan , 2018-12-11, 08:40
[SPARK-26297] improve the doc of Distribution/Partitioning - Spark - [issue]
http://issues.apache.org/jira/browse/SPARK-26297    Author: Wenchen Fan , 2018-12-11, 05:16
[SPARK-26323] check input types of ScalaUDF even if some inputs are of Any type - Spark - [issue]
http://issues.apache.org/jira/browse/SPARK-26323    Author: Wenchen Fan , 2018-12-11, 02:13
[SPARK-25530] data source v2 API refactor (batch write) - Spark - [issue]
...Adjust the batch write API to match the read API after refactor...
http://issues.apache.org/jira/browse/SPARK-25530    Author: Wenchen Fan , 2018-12-11, 01:48
[SPARK-26313] move read related methods from Table to read related mix-in traits - Spark - [issue]
http://issues.apache.org/jira/browse/SPARK-26313    Author: Wenchen Fan , 2018-12-11, 01:42
Pushdown in DataSourceV2 question - Spark - [mail # dev]
...expressions/functions can be expensive and I do think Spark should trustdata source and not re-apply pushed filters. If data source lies, manythings can go wrong...On Sun, Dec 9, 2018 at 8:1...
   Author: Wenchen Fan , 2018-12-09, 13:31
[SPARK-26215] define reserved keywords after SQL standard - Spark - [issue]
...There are 2 kinds of SQL keywords: reserved and non-reserved. Reserved keywords can't be used as identifiers.In Spark SQL, we are too tolerant about non-reserved keywors. A lot of keywords a...
http://issues.apache.org/jira/browse/SPARK-26215    Author: Wenchen Fan , 2018-12-08, 05:12
[SPARK-26244] Do not use case class as public API - Spark - [issue]
...It's a bad idea to use case class as public API, as it has a very wide surface. For example, the copy method, its fields, the companion object, etc.I don't think it's expect to expose so man...
http://issues.apache.org/jira/browse/SPARK-26244    Author: Wenchen Fan , 2018-12-06, 14:40
Run a specific PySpark test or group of tests - Spark - [mail # dev]
...great job! thanks a lot!On Thu, Dec 6, 2018 at 9:39 AM Hyukjin Kwon  wrote:> It's merged now and in developer tools page -> http://spark.apache.org/developer-tools.html#individual...
   Author: Wenchen Fan , 2018-12-06, 05:21
[SPARK-26160] Make assertNotBucketed call in DataFrameWriter::save optional - Spark - [mail # dev]
...The bucket feature is designed to only work with data sources with tablesupport, and currently the table support is not public yet, which means noexternal data sources can access bucketing i...
   Author: Wenchen Fan , 2018-12-05, 14:51