Add BOOL as data type

[MoonE]

Fixes #490

Adds BOOL as data type, has been available since at least MySQL 3.23
https://github.com/mysql/mysql-server/blob/f4c589ff6c653d1d2a09c26e46ead3c8a15655d8/sql/sql_yacc.yy#L818-L819

[williamdes]

Thank you!

[kamil-tekiela]

Can you please expand this to all aliases? https://dev.mysql.com/doc/refman/8.0/en/other-vendor-data-types.html
Currently PMA crashes badly if SP uses some of these types.

Test:

CREATE PROCEDURE `p` (
         IN b1 BOOL,
         IN b2 BOOLEAN,
         IN b3 CHARACTER VARYING(5),
         IN b4 FIXED,
         IN b5 FLOAT4,
         IN b6 FLOAT8,
         IN b7 INT1,
         IN b8 LONG VARBINARY,
         IN b9 NUMERIC,
         IN b10 LONG
     ) BEGIN END;

Ref #18633

[MoonE]

What is the correct flag here? I used (D) for BOOL because that's what BOOLEAN was already using. But INT uses (D) and (R). Why isn't BOOLEAN a reserved word, how would you know?

Also why aren't all types defined in _common.txt where it's the always the same?
Imo it could be INT (R) (D) there.

[kamil-tekiela]

I don't know why some words are not reserved words. See the full list here https://dev.mysql.com/doc/refman/8.0/en/keywords.html