Cheng Lian 5d8de16e71 [SPARK-14004][SQL] NamedExpressions should have at most one qualifier ... ## What changes were proposed in this pull request? This is a more aggressive version of PR #11820, which not only fixes the original problem, but also does the following updates to enforce the at-most-one-qualifier constraint: - Renames `NamedExpression.qualifiers` to `NamedExpression.qualifier` - Uses `Option[String]` rather than `Seq[String]` for `NamedExpression.qualifier` Quoted PR description of #11820 here: > Current implementations of `AttributeReference.sql` and `Alias.sql` joins all available qualifiers, which is logically wrong. But this implementation mistake doesn't cause any real SQL generation bugs though, since there is always at most one qualifier for any given `AttributeReference` or `Alias`. ## How was this patch tested? Existing tests should be enough. Author: Cheng Lian <lian@databricks.com> Closes #11822 from liancheng/spark-14004-aggressive.		2016-03-21 11:00:09 -07:00
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resources/META-INF/services	[SPARK-9486][SQL] Add data source aliasing for external packages	2015-08-08 11:03:01 -07:00
scala/org/apache/spark/sql/hive	[SPARK-14004][SQL] NamedExpressions should have at most one qualifier	2016-03-21 11:00:09 -07:00