SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function overlay (children 1)
     ExpressionList (children 4)
      Literal \'Spark SQL\'
      Literal \'ANSI \'
      Literal UInt64_7
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal UInt64_0
    Function overlayUTF8 (children 1)
     ExpressionList (children 4)
      Literal \'Spark SQL和CH\'
      Literal \'ANSI \'
      Literal UInt64_7
      Function materialize (children 1)
       ExpressionList (children 1)
        Literal UInt64_0