# Presto 316 Documentation

## 12.57. Release 0.176

## General Changes

- Fix an issue where a query (and some of its tasks) continues to consume CPU/memory on the coordinator and workers after the query fails.
- Fix a regression that cause the GC overhead and pauses to increase significantly when processing maps.
- Fix a memory tracking bug that causes the memory to be overestimated for `GROUP BY` queries on `bigint` columns.
- Improve the performance of the `transform_values()` function.
- Add support for casting from `JSON` to `REAL` type.
- Add `parse_duration()` function.

## MySQL Changes

- Disallow having a database in the `connection-url` config property.

## Accumulo Changes

- Decrease planning time by fetching index metrics in parallel.

## MongoDB Changes

- Allow predicate pushdown for ObjectID.