arangosh> db._explain("LET s = SLEEP(0.25) LET t = SLEEP(0.5) RETURN 1", {}, {colors: false});
Query String:
 LET s = SLEEP(0.25) LET t = SLEEP(0.5) RETURN 1

Execution plan:
 Id   NodeType          Est.   Comment
  1   SingletonNode        1   * ROOT
  4   CalculationNode      1     - LET #2 = 1   /* json expression */   /* const assignment */
  2   CalculationNode      1     - LET s = SLEEP(0.25)   /* simple expression */
  3   CalculationNode      1     - LET t = SLEEP(0.5)   /* simple expression */
  5   ReturnNode           1     - RETURN #2

Indexes used:
 none

Functions used:
 Name    Deterministic   Cacheable   Uses V8
 SLEEP   false           false       false  

Optimization rules applied:
 Id   RuleName
  1   move-calculations-up