array_last

SinceVersion 2.0

array_last

description

Returns the last element in the array for which func(arr1[i]) returns something other than 0.

Syntax

  1. T array_last(lambda, ARRAY<T>)

Use a lambda bool expression and an array as the input parameters, the lambda expression is used to evaluate the internal data of other input ARRAY parameters.

notice

Only supported in vectorized engine

example

  1. mysql> select array_last(x->x>2, [1,2,3,0]) ;
  2. +------------------------------------------------------------------------------------------------+
  3. | array_last(array_filter(ARRAY(1, 2, 3, 0), array_map([x] -> x(0) > 2, ARRAY(1, 2, 3, 0))), -1) |
  4. +------------------------------------------------------------------------------------------------+
  5. |                                                                                              3 |
  6. +------------------------------------------------------------------------------------------------+
  9. mysql> select array_last(x->x>4, [1,2,3,0]) ; 
  10. +------------------------------------------------------------------------------------------------+
  11. | array_last(array_filter(ARRAY(1, 2, 3, 0), array_map([x] -> x(0) > 4, ARRAY(1, 2, 3, 0))), -1) |
  12. +------------------------------------------------------------------------------------------------+
  13. |                                                                                           NULL |
  14. +------------------------------------------------------------------------------------------------+
  17. ### keywords
  19. ARRAY, LAST, ARRAY_LAST