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[SPARK-17753][SQL] Allow a complex expression as the input a value based case statement
## What changes were proposed in this pull request? We currently only allow relatively simple expressions as the input for a value based case statement. Expressions like `case (a > 1) or (b = 2) when true then 1 when false then 0 end` currently fail. This PR adds support for such expressions. ## How was this patch tested? Added a test to the ExpressionParserSuite. Author: Herman van Hovell <hvanhovell@databricks.com> Closes #15322 from hvanhovell/SPARK-17753.
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- sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 6 additions, 6 deletions...in/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala 1 addition, 1 deletion...ala/org/apache/spark/sql/catalyst/parser/AstBuilder.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/parser/ExpressionParserSuite.scala 4 additions, 0 deletions...che/spark/sql/catalyst/parser/ExpressionParserSuite.scala
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