[LucaCappelletti94]

ALTER DOMAIN d1 SET DEFAULT 0, and every other form of the statement, fails with Expected: one of VIEW or TYPE or COLLATION or TABLE ..., found: DOMAIN, because parse_alter has no DOMAIN arm.

Statement::AlterDomain now wraps an AlterDomain struct holding the domain name and an AlterDomainOperation, the shape AlterCollation already uses, and covers all eleven operations in the PostgreSQL grammar. A domain constraint can only be NOT NULL or CHECK, so ADD parses into a new DomainConstraint enum with those two variants, and ALTER DOMAIN d ADD PRIMARY KEY (VALUE) is refused as PostgreSQL refuses it. The CHECK body parsing moves into a helper that table constraints share. Like CREATE DOMAIN and ALTER COLLATION, the statement is not gated on the dialect.

I reckon one very api breaking thing we might want to do at some point is to group the statements by things like Drop, Alter, Create and so on.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.14%. Comparing base (1071d75) to head (14c1a48).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2796      +/-   ##
==========================================
+ Coverage   83.09%   83.14%   +0.05%     
==========================================
  Files          42       42              
  Lines       36261    36358      +97     
  Branches    36261    36358      +97     
==========================================
+ Hits        30130    30231     +101     
  Misses       2636     2636              
+ Partials     3495     3491       -4     

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