Marco Gaido 0736e72a66 [SPARK-25371][SQL] struct() should allow being called with 0 args ... ## What changes were proposed in this pull request? SPARK-21281 introduced a check for the inputs of `CreateStructLike` to be non-empty. This means that `struct()`, which was previously considered valid, now throws an Exception. This behavior change was introduced in 2.3.0. The change may break users' application on upgrade and it causes `VectorAssembler` to fail when an empty `inputCols` is defined. The PR removes the added check making `struct()` valid again. ## How was this patch tested? added UT Closes #22373 from mgaido91/SPARK-25371. Authored-by: Marco Gaido <marcogaido91@gmail.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com>		2018-09-11 14:16:56 +08:00
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src	[SPARK-25371][SQL] struct() should allow being called with 0 args	2018-09-11 14:16:56 +08:00
pom.xml	[SPARK-23028] Bump master branch version to 2.4.0-SNAPSHOT	2018-01-13 00:37:59 +08:00