SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Literal \'{"a": "hello", "b": 12345678901234567890}\' (alias json)
   ExpressionList (children 1)
    Function JSONExtractRaw (children 1)
     ExpressionList (children 2)
      Identifier json
      Literal \'a\'