Coordinator crashes from Ranger plugin JavaScript policy memory leak

When Trino coordinator uses Ranger plugin with policy conditions containing JavaScript and regex, heap memory continuously fills until coordinator crashes. Heap dumps show GraalVM Truffle objects (JSFunctionObject$Unbound, TruffleString) accumulating 700+ GB with no GC cleanup, even after removing regex/functions from policies. Affects Trino 476 with Ranger plugin 476.

Immediate: Remove JavaScript and regex from Ranger policy conditions to stop leak. Take heap dumps to confirm Truffle/GraalVM object accumulation. Long-term: Upgrade to Ranger 3.0 which includes fixes for JavaScript evaluation object thrashing. Monitor heap usage trends via heap_memory.used metric approaching heap_memory.max. Consider coordinator heap size increase as temporary mitigation.