# Presto 316 Documentation

## 12.135. Release 0.109

## General Changes

- Add `slice()`, `md5()`, `array_min()` and `array_max()` functions.
- Fix bug that could cause queries submitted soon after startup to hang forever.
- Fix bug that could cause `JOIN` queries to hang forever, if the right side of the `JOIN` had too little data or skewed data.
- Improve index join planning heuristics to favor streaming execution.
- Improve validation of date/time literals.
- Produce RPM package for Presto server.
- Always redistribute data when writing tables to avoid skew. This can be disabled by setting the session property `redistribute_writes` or the config property `redistribute-writes` to false.

## Remove “Big Query” Support

The experimental support for big queries has been removed in favor of the new resource manager which can be enabled via the `experimental.cluster-memory-manager-enabled` config option. The `experimental_big_query` session property and the following config options are no longer supported: `experimental.big-query-initial-hash-partitions`, `experimental.max-concurrent-big-queries` and `experimental.max-queued-big-queries`.