IS_IPV4_COMPAT gives wrong result for all zero value

[YangKeao]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

mysql> SELECT IS_IPV4_COMPAT(X'00000000000000000000000000000000');
+-----------------------------------------------------+
| IS_IPV4_COMPAT(X'00000000000000000000000000000000') |
+-----------------------------------------------------+
|                                                   0 |
+-----------------------------------------------------+
1 row in set (0.04 sec)

3. What did you see instead (Required)

mysql> SELECT IS_IPV4_COMPAT(X'00000000000000000000000000000000');
+-----------------------------------------------------+
| IS_IPV4_COMPAT(X'00000000000000000000000000000000') |
+-----------------------------------------------------+
|                                                   1 |
+-----------------------------------------------------+
1 row in set (0.00 sec)

4. What is your TiDB version? (Required)

[zanmato1984]

/severity moderate

[zanmato1984]

/severity moderate