Marco Gaido 0b150f833c [SPARK-26224][SQL] Advice the user when creating many project on subsequent calls to withColumn ... ## What changes were proposed in this pull request? We have seen many cases when users make several subsequent calls to `withColumn` on a Dataset. This leads now to the generation of a lot of `Project` nodes on the top of the plan, with serious problem which can lead also to `StackOverflowException`s. The PR improves the doc of `withColumn`, in order to advise the user to avoid this pattern and do something different, ie. a single select with all the column he/she needs. ## How was this patch tested? NA Closes #23285 from mgaido91/SPARK-26224. Authored-by: Marco Gaido <marcogaido91@gmail.com> Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>		2019-04-02 14:12:47 +09:00
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benchmarks	[SPARK-27327][SQL] New JSON benchmarks: functions, Dataset[String]	2019-04-01 08:33:16 +09:00
src	[SPARK-26224][SQL] Advice the user when creating many project on subsequent calls to withColumn	2019-04-02 14:12:47 +09:00
v1.2.1/src	[SPARK-27182][SQL] Move the conflict source code of the sql/core module to sql/core/v1.2.1	2019-03-26 22:32:03 -07:00
v2.3.4/src	[SPARK-27182][SQL] Move the conflict source code of the sql/core module to sql/core/v1.2.1	2019-03-26 22:32:03 -07:00
pom.xml	[SPARK-27182][SQL] Move the conflict source code of the sql/core module to sql/core/v1.2.1	2019-03-26 22:32:03 -07:00