doris

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lihangyu 7ba4cd764a [enhancement](array-function) array_position,array_contains,countequal which in FunctionArrayIndex handle target NULL (#14564 )

in the previous, the result is:
```
mysql> select array_position([1, null], null);
+--------------------------------------+
| array_position(ARRAY(1, NULL), NULL) |
+--------------------------------------+
|                                 NULL |
+--------------------------------------+
1 row in set (0.02 sec)
```

but after this commit, the result become:
```
mysql> select array_position([1, null], null);
+--------------------------------------+
| array_position(ARRAY(1, NULL), NULL) |
+--------------------------------------+
|                                    2 |
+--------------------------------------+
1 row in set (0.02 sec)
```

2022-11-25 14:19:50 +08:00