SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 1)
    Function JSONExtractStringCaseInsensitive (children 1)
     ExpressionList (children 2)
      Literal \'{"key_with_underscore": "value2"}\'
      Literal \'KEY_WITH_UNDERSCORE\'
