Dongjoon Hyun a7ce473bd0 [SPARK-14415][SQL] All functions should show usages by command DESC FUNCTION ... ## What changes were proposed in this pull request? Currently, many functions do now show usages like the followings. ``` scala> sql("desc function extended `sin`").collect().foreach(println) [Function: sin] [Class: org.apache.spark.sql.catalyst.expressions.Sin] [Usage: To be added.] [Extended Usage: To be added.] ``` This PR adds descriptions for functions and adds a testcase prevent adding function without usage. ``` scala> sql("desc function extended `sin`").collect().foreach(println); [Function: sin] [Class: org.apache.spark.sql.catalyst.expressions.Sin] [Usage: sin(x) - Returns the sine of x.] [Extended Usage: > SELECT sin(0); 0.0] ``` The only exceptions are `cube`, `grouping`, `grouping_id`, `rollup`, `window`. ## How was this patch tested? Pass the Jenkins tests (including new testcases.) Author: Dongjoon Hyun <dongjoon@apache.org> Closes #12185 from dongjoon-hyun/SPARK-14415.		2016-04-10 11:46:45 -07:00
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src	[SPARK-14415][SQL] All functions should show usages by command DESC FUNCTION	2016-04-10 11:46:45 -07:00
pom.xml	[SPARK-14211][SQL] Remove ANTLR3 based parser	2016-03-31 09:25:09 -07:00