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…ements Signed-off-by: minleejae <mmj9808@gmail.com>
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PostgreSQL accepts
ALTER TABLE t ALTER COLUMN id SET DATA TYPE bigint USING id::bigint, but the parser rejected SET DATA TYPE.ALTER COLUMN g SET EXPRESSION AS (...)could parse as a column type change, leaving the expression inaccessible through the appropriate AST node.Share the TYPE/SET DATA TYPE prefix between ALTER TABLE and ALTER TYPE, and share generated-expression parsing/rendering with CREATE TABLE. Add a distinct SET_EXPRESSION action whose expression participates in visitors and deparsing, while retaining existing type-change accessors.
Tests cover both type prefixes, USING/COLLATE, composite attributes, optional COLUMN, expression mutation and custom deparsing, multiple actions, and invalid contexts. Relevant corpus cases were executed on PostgreSQL 18.6 using original SQL, toString output, and StatementDeParser output; resulting catalog definitions match.
Syntax references: ALTER TABLE, ALTER TYPE.
Validation: focused tests, JavaCC ambiguity checks, Checkstyle and Spotless on this independent branch. The combined implementation also passes the full Gradle check and Maven verify; the 1,304-input prior regression corpus has no previously successful input regressions.