SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 5)
    Function CAST (alias json) (children 1)
     ExpressionList (children 2)
      Literal \'{"a" : [{"b" : 42}]}\'
      Literal \'JSON(a Array(JSON))\'
    Identifier json.a.b
    Function CAST (alias json2) (children 1)
     ExpressionList (children 2)
      Identifier json
      Literal \'JSON\'
    Function dynamicType (children 1)
     ExpressionList (children 1)
      Identifier json2.a
    Identifier json2.a.:`Array(JSON)`.b
