Kris Mok 15ad4a7f10 [SPARK-23447][SQL] Cleanup codegen template for Literal ... ## What changes were proposed in this pull request? Cleaned up the codegen templates for `Literal`s, to make sure that the `ExprCode` returned from `Literal.doGenCode()` has: 1. an empty `code` field; 2. an `isNull` field of either literal `true` or `false`; 3. a `value` field that is just a simple literal/constant. Before this PR, there are a couple of paths that would return a non-trivial `code` and all of them are actually unnecessary. The `NaN` and `Infinity` constants for `double` and `float` can be accessed through constants directly available so there's no need to add a reference for them. Also took the opportunity to add a new util method for ease of creating `ExprCode` for inline-able non-null values. ## How was this patch tested? Existing tests. Author: Kris Mok <kris.mok@databricks.com> Closes #20626 from rednaxelafx/codegen-literal.		2018-02-17 10:54:14 +08:00
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main	[SPARK-23447][SQL] Cleanup codegen template for Literal	2018-02-17 10:54:14 +08:00
test	[SPARK-23359][SQL] Adds an alias 'names' of 'fieldNames' in Scala's StructType	2018-02-15 17:13:05 +08:00