add docs for array_pop_front

Signed-off-by: veeupup <code@tanweime.com>

Author: Veeupup

docs/source/user-guide/expressions.md

@@ -219,6 +219,7 @@ Unlike to some databases the math functions in Datafusion works the same way as
 | flatten(array)                        | Converts an array of arrays to a flat array `flatten([[1], [2, 3], [4, 5, 6]]) -> [1, 2, 3, 4, 5, 6]`                                                                    |
 | array_length(array, dimension)        | Returns the length of the array dimension. `array_length([1, 2, 3, 4, 5]) -> 5`                                                                                          |
 | array_ndims(array)                    | Returns the number of dimensions of the array. `array_ndims([[1, 2, 3], [4, 5, 6]]) -> 2`                                                                                |
+| array_pop_front(array)                | Returns the array without the first element. `array_pop_front([1, 2, 3]) -> [2, 3]`                                                                                      |
 | array_pop_back(array)                 | Returns the array without the last element. `array_pop_back([1, 2, 3]) -> [1, 2]`                                                                                        |
 | array_position(array, element)        | Searches for an element in the array, returns first occurrence. `array_position([1, 2, 2, 3, 4], 2) -> 2`                                                                |
 | array_positions(array, element)       | Searches for an element in the array, returns all occurrences. `array_positions([1, 2, 2, 3, 4], 2) -> [2, 3]`                                                           |

docs/source/user-guide/sql/scalar_functions.md

@@ -1515,6 +1515,7 @@ from_unixtime(expression)
 - [array_length](#array_length)
 - [array_ndims](#array_ndims)
 - [array_prepend](#array_prepend)
+- [array_pop_front](#array_pop_front)
 - [array_pop_back](#array_pop_back)
 - [array_position](#array_position)
 - [array_positions](#array_positions)
@@ -1867,6 +1868,30 @@ array_prepend(element, array)
 - list_prepend
 - list_push_front
 
+### `array_pop_front`
+
+Returns the array without the first element.
+
+```
+array_pop_first(array)
+```
+
+#### Arguments
+
+- **array**: Array expression.
+  Can be a constant, column, or function, and any combination of array operators.
+
+#### Example
+
+```
+❯ select array_pop_first([1, 2, 3]);
++-------------------------------+
+| array_pop_first(List([1,2,3])) |
++-------------------------------+
+| [2, 3]                        |
++-------------------------------+
+```
+
 ### `array_pop_back`
 
 Returns the array without the last element.