GitHub user mgaido91 opened a pull request: https://github.com/apache/spark/pull/22391
[SPARK-25371][SQL][BACKPORT-2.3] 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 You can merge this pull request into a Git repository by running: $ git pull https://github.com/mgaido91/spark SPARK-25371_2.3 Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/22391.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 #22391 ---- commit 66b6bd5b7e1538d60915b62fa1155dcd86f3411a Author: Marco Gaido <marcogaido91@...> Date: 2018-09-11T06:16:56Z [SPARK-25371][SQL] struct() should allow being called with 0 args 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. added UT Closes #22373 from mgaido91/SPARK-25371. Authored-by: Marco Gaido <marcogaid...@gmail.com> Signed-off-by: Wenchen Fan <wenc...@databricks.com> ---- --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org