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   1 # pq\Query\Expr pq\Query\Expr::add(pq\Query\Expr $next)
   2
   3 Add an expression at the end of the linked list.
   4
   5 ## Params:
   6
   7 * pq\Query\Expr $next
   8   The expression to add.
   9
  10 ## Returns:
  11
  12 * pq\Query\Expr, self.
  13
  14 ## Throws:
  15
  16 * UnexpectedValueException, if the receiving expression is NULL.