MySQL: Keep literal prefixes as identifiers after a period

[LucaCappelletti94]

MySQL accepts SELECT t.x'ff' FROM t as column x with alias ff, and similarly accepts qualified columns named b and n. The tokenizer recognizes a prefixed literal after the period, so these queries fail to parse. Qualified-name rules are documented by MySQL and MariaDB.

Dialect::supports_literal_prefix_in_qualified_name() enables identifier tokenization immediately after a period for MySQL and the generic dialect. Whitespace or comments after the period retain literal tokenization, as do unqualified prefixes. Other dialects retain their literal handling.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.32%. Comparing base (3330dc9) to head (4879487).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2688   +/-   ##
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  Coverage   81.31%   81.32%           
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  Files          42       42           
  Lines       33977    33990   +13     
  Branches    33977    33990   +13     
=======================================
+ Hits        27628    27641   +13     
  Misses       2785     2785           
  Partials     3564     3564           

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