SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function CAST (alias json) (children 1)
     ExpressionList (children 2)
      Literal \'{"a" : [42.42, false]}\'
      Literal \'JSON\'
    Function dynamicType (children 1)
     ExpressionList (children 1)
      Identifier json.a
   Set
