[GitHub] spark pull request #17698: [SPARK-20403][SQL]Modify the instructions of some...

[HyukjinKwon <gi...@git.apache.org>]

Github user HyukjinKwon commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17698#discussion_r115741200
  
    --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala ---
    @@ -428,6 +428,8 @@ object FunctionRegistry {
         expression[StructsToJson]("to_json"),
         expression[JsonToStructs]("from_json"),
     
    +    // cast
    +    expression[Cast]("cast"),
    --- End diff --
    
    Do we need this? I think we cover this in the parser.


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