claude@clouddev1
338dc8a4cf
The standard-first ALTER COLUMN constraint gap-fill advanced mode lacked: - ALTER COLUMN <c> SET DATA TYPE <ty> — ISO canonical synonym for the PostgreSQL TYPE shorthand (same AlterColumnType action + executor). - SET NOT NULL / DROP NOT NULL — reuse the ADR-0029 do_add_constraint / do_drop_constraint executors (dry-run + internal-table guards free). - SET DEFAULT <expr> / DROP DEFAULT — SET DEFAULT uses a dedicated raw-SQL executor (do_set_column_default); sql_expr yields no typed Value, so it can't go through do_add_constraint. DROP DEFAULT reuses do_drop_constraint. Grammar: AT_ALTER_COLUMN gains a tail Choice (type / set / drop), reusing SQL_TYPE and the CREATE TABLE DEFAULT_NODES; builder dispatch routes the new column-attribute forms; runtime decomposes to the executors. ADR-0035 Am2 corrected in-place: SET DEFAULT decomposes to do_set_column_default, not do_add_constraint (Value-based) — found during build. Tests (test-first): 6 parse + 7 Tier-3 execution via run_replay. Suite 1962/0/1; clippy clean.