[ritojoao]

Fixes #2563

What was wrong

age_tobooleanlist, age_tofloatlist, age_tointegerlist and age_tostringlist are declared with VARIADIC "any". When one of them is called from plain SQL with an untyped literal such as '[true]', the argument is not an agtype, but the C code read it as one. On a cassert build of PostgreSQL 18 this terminated the backend (server closed the connection unexpectedly). Passing '[true]'::agtype and calling through Cypher were not affected.

What changed

Each of the four functions now checks get_fn_expr_argtype(fcinfo->flinfo, 0) != AGTYPEOID and raises an ordinary error (for example toBooleanList() argument must be of type agtype). This is the same approach age_tail already uses. I added regression cases to regress/sql/expr.sql and regress/expected/expr.out: the four failing calls, plus two calls with ::agtype that still work.

How tested

Environment: Ubuntu 24.04 container (Bison 3.8.2), PostgreSQL REL_18_STABLE built with --enable-cassert -O0, AGE built with COPT=-Werror, then make installcheck EXTRA_TESTS="pgvector fuzzystrmatch pg_trgm", following installcheck.yaml.

• master with the new test files, without the fix: the expr test fails because the server terminates abnormally at the first new call.
• unmodified master: all 47 tests pass.
• this branch: all 47 tests pass.

Not run: the other PostgreSQL versions, the driver workflows (go, jdbc, nodejs, python), and the upgrade-script checks beyond what make installcheck runs by itself.

Thank you for taking a look.