SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 3)
    Literal \'{"a":"1","b":"2","c":"","d":"4"}{"a":"1","b":"2","c":"","d":"4"}{"a":"1","b":"2","c":"","d":"4"}{"a":"1","b":"2","c":"","d":"4"}\' (alias json)
    Function extractAll (alias keys) (children 1)
     ExpressionList (children 2)
      Identifier json
      Literal \'"([^"]*)":\'
    Function extractAll (alias values) (children 1)
     ExpressionList (children 2)
      Identifier json
      Literal \':"\\0[^"]*)"\'