feat(parser)!: MySQL accepts non-CSV table options.

[burnison]

An ALTER TABLE in MySQL allows table options to be passed without commas,

ALTER TABLE tbl_name
    [alter_option [, alter_option] ...]
    [partition_options]

alter_option: {
    table_options
    ...

table_options:
    table_option [[,] table_option] ...

This commit adds OPTIONAL_COMMA_BETWEEN_ALTER_TABLE_OPTIONS, which, when True, correctly parses a query like

ALTER TABLE t ADD i int, ENGINE=INNODB COMMENT='hi' AUTO_INCREMENT=5

Adding this support in MySQL raised a small issue, where CHARSET is a valid alias of CHARACTER SET, but was otherwise parsed as a table option.

[Copilot]

Copilot review overview

🟢 Approval recommended

The changes align with existing parser behavior and include focused regression coverage, with no confirmed blocking issues.

Review effort: Balanced
Findings: None

What changed in this PR

Extends SQLGlot’s MySQL DDL parser to accept table options without commas and recognize column-level CHARSET aliases.

Changes:

• Enables optional commas between MySQL ALTER TABLE options.
• Adds CHARSET column-constraint parsing.
• Adds regression coverage for mixed options, charset handling, and comments.

File	Description
tests/​dialects/​test_mysql.py	Adds DDL parsing and expression assertions.
sqlglot/​parsers/​mysql.py	Enables optional commas and column CHARSET support.
sqlglot/​parser.py	Adds configurable ALTER option parsing and property separator handling.

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