TIME() function infers precision based off input #11944

mysql> select time('12:34:56.123456');
Field   1:  `time('12:34:56.123456')`
Catalog:    `def`
Database:   ``
Table:      ``
Org_table:  ``
Type:       TIME
Collation:  binary (63)
Length:     17
Max_length: 15
Decimals:   6
Flags:      BINARY 


+-------------------------+
| time('12:34:56.123456') |
+-------------------------+
| 12:34:56.123456         |
+-------------------------+
1 row in set (0.00 sec)

mysql> select time('12:34:56.1234');
Field   1:  `time('12:34:56.1234')`
Catalog:    `def`
Database:   ``
Table:      ``
Org_table:  ``
Type:       TIME
Collation:  binary (63)
Length:     15
Max_length: 13
Decimals:   4
Flags:      BINARY 


+-----------------------+
| time('12:34:56.1234') |
+-----------------------+
| 12:34:56.1234         |
+-----------------------+
1 row in set (0.00 sec)