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lihangyu bc699511d0 [Fix](array-function) fix array_distinct null values (#14544 )

in the previous the result is:
```
mysql> select array_distinct([1,1,3,3,null, null, null]);
+-----------------------------------------------------+
| array_distinct(ARRAY(1, 1, 3, 3, NULL, NULL, NULL)) |
+-----------------------------------------------------+
| [1, 3, NULL, NULL, NULL]                            |
+-----------------------------------------------------+
1 row in set (0.00 sec)
```

after this fix, the result becomes:
```
mysql> select array_distinct([1,1,3,3,null, null, null]);
+-----------------------------------------------------+
| array_distinct(ARRAY(1, 1, 3, 3, NULL, NULL, NULL)) |
+-----------------------------------------------------+
| [1, 3, NULL]                                        |
+-----------------------------------------------------+
1 row in set (0.00 sec)
```

2022-11-24 19:07:28 +08:00