Takeshi Yamamuro b0888d1ac3 [SPARK-20730][SQL] Add an optimizer rule to combine nested Concat ... ## What changes were proposed in this pull request? This pr added a new Optimizer rule to combine nested Concat. The master supports a pipeline operator '||' to concatenate strings in #17711 (This pr is follow-up). Since the parser currently generates nested Concat expressions, the optimizer needs to combine the nested expressions. ## How was this patch tested? Added tests in `CombineConcatSuite` and `SQLQueryTestSuite`. Author: Takeshi Yamamuro <yamamuro@apache.org> Closes #17970 from maropu/SPARK-20730.		2017-05-15 16:24:55 +08:00
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antlr4/org/apache/spark/sql/catalyst/parser	[SPARK-20719][SQL] Support LIMIT ALL	2017-05-12 15:26:10 -07:00
java/org/apache/spark/sql	[SPARK-20523][BUILD] Clean up build warnings for 2.2.0 release	2017-05-03 10:18:35 +01:00
scala/org/apache/spark/sql	[SPARK-20730][SQL] Add an optimizer rule to combine nested Concat	2017-05-15 16:24:55 +08:00