# Presto 316 Documentation

## 12.55. Release 0.178

## General Changes

- Fix various memory accounting bugs, which reduces the likelihood of full GCs/OOMs.
- Fix a regression that causes queries that use the keyword “stats” to fail to parse.
- Fix an issue where a query does not get cleaned up on the coordinator after query failure.
- Add ability to cast to `JSON` from `REAL`, `TINYINT` or `SMALLINT`.
- Add support for `GROUPING` operation to complex grouping operations.
- Add support for correlated subqueries in `IN` predicates.
- Add `to_ieee754_32()` and `to_ieee754_64()` functions.

## Hive Changes

- Fix high CPU usage due to schema caching when reading Avro files.
- Preserve decompression error causes when decoding ORC files.

## Memory Connector Changes

- Fix a bug that prevented creating empty tables.

## SPI Changes

- Make environment available to resource group configuration managers.
- Add additional performance statistics to query completion event.