# Presto 316 Documentation

## 12.165. Release 0.79

## Hive Changes

- Add configuration option `hive.force-local-scheduling` and session property `force_local_scheduling` to force local scheduling of splits.
- Add new experimental optimized RCFile reader. The reader can be enabled by setting the configuration option `hive.optimized-reader.enabled` or session property `optimized_reader_enabled`.

## General Changes

- Add support for UNNEST, which can be used as a replacement for the `explode()` function in Hive.
- Fix a bug in the scan operator that can cause data to be missed. It currently only affects queries over `information_schema` or `sys` tables, metadata queries such as `SHOW PARTITIONS` and connectors that implement the `ConnectorPageSource` interface.