# Presto 316 Documentation

## 12.111. Release 0.133

## General Changes

- Add support for calling connector-defined procedures using CALL.
- Add System Connector procedure for killing running queries.
- Properly expire idle transactions that consist of just the start transaction statement and nothing else.
- Fix possible deadlock in worker communication when task restart is detected.
- Performance improvements for aggregations on dictionary encoded data. This optimization is turned off by default. It can be configured via the `optimizer.dictionary-aggregation` config property or the `dictionary_aggregation` session property.
- Fix race which could cause queries to fail when using `concat()` on ARRAY, or when enabling `columnar_processing_dictionary`.
- Add sticky headers and the ability to sort the tasks table on the query page in the web interface.