Parse COLLATE BINARY on individual columns.

[nicktobey]

We should be able to parse statements like:

create table test (pk varchar(255) collate binary)

This particular example will eventually get rewritten as create table test (pk varbinary(255)), but that doesn't happen during parsing, so the added vitess tests still expect varchar.

[jycor]

LGTM, maybe add tests in GMS using SHOW CREATE TABLE to make sure these are actually rewritten to varbinary.

tmp> create table t2 (i varchar(10) charset binary);
tmp> show create table t2;
+-------+------------------------------------------------------------------+
| Table | Create Table                                                     |
+-------+------------------------------------------------------------------+
| t2    | CREATE TABLE `t2` (                                              |
|       |   `i` varbinary(10)                                              |
|       | ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_bin |
+-------+------------------------------------------------------------------+
1 row in set (0.00 sec)

[nicktobey]

LGTM, maybe add tests in GMS using SHOW CREATE TABLE to make sure these are actually rewritten to varbinary.

tmp> create table t2 (i varchar(10) charset binary);
tmp> show create table t2;
+-------+------------------------------------------------------------------+
| Table | Create Table                                                     |
+-------+------------------------------------------------------------------+
| t2    | CREATE TABLE `t2` (                                              |
|       |   `i` varbinary(10)                                              |
|       | ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_bin |
+-------+------------------------------------------------------------------+
1 row in set (0.00 sec)

I'll include a test like that in the GMS bump.