Missing support for COLLATE inside WHERE

The following query results in 3 unexpected token errors, and 1 unrecognized keyword.

Is this intentional that this is considered an error?

```sql
SELECT  1
FROM   my_table
WHERE   first_col = ?
AND     second_col COLLATE utf8_bin = ?
```

Without the COLLATE everything is fine:

```sql
SELECT  1
FROM   my_table
WHERE   first_col = ?
AND     second_col = ?
```