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

    https://github.com/apache/spark/pull/13775#discussion_r83751452
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/internal/SQLConf.scala ---
    @@ -251,6 +251,12 @@ object SQLConf {
           .booleanConf
           .createWithDefault(true)
     
    +  val ORC_VECTORIZED_READER_ENABLED =
    +    SQLConfigBuilder("spark.sql.orc.enableVectorizedReader")
    +      .doc("Enables vectorized orc reader.")
    +      .booleanConf
    +      .createWithDefault(true)
    --- End diff --
    
    Please turn it off by default. Until there is more testing, this might be 
risky thing to do. If you have productionised this code and have been running 
smoothly for sometime, then it would be comfortable to launch with default 
turned on.


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