Parser rejects valid INSERT ... SELECT syntax

[ajitpratap0]

Description

INSERT INTO users (id) SELECT id FROM other fails with error E2002 "expected VALUES, got SELECT".

INSERT ... SELECT is standard SQL supported by all major databases. The parser currently only expects VALUES after INSERT INTO.

Reproduction

sql := "INSERT INTO users (id) SELECT id FROM other"
_, err := parser.Parse(sql)
// Returns: E2002 "expected VALUES, got SELECT"

Expected

Parser should accept INSERT ... SELECT as valid SQL and produce an appropriate AST node.

Impact

Critical — INSERT ... SELECT is extremely common in ETL, data migration, and general SQL usage.