# Presto 316 Documentation

## 12.161. Release 0.83

## Raptor Changes

- Raptor now enables specifying the backup storage location. This feature is highly experimental.
- Fix the handling of shards not assigned to any node.

## General Changes

- Fix resource leak in query queues.
- Fix NPE when writing null `ARRAY/MAP` to Hive.
- Fix `json_array_get()` to handle nested structures.
- Fix `UNNEST` on null collections.
- Fix a regression where queries that fail during parsing or analysis do not expire.
- Make `JSON` type comparable.
- Added an optimization for hash aggregations. This optimization is turned off by default. To turn it on, add `optimizer.optimize-hash-generation=true` to the coordinator config properties.