# Presto 316 Documentation

## 12.15. Release 302

## General Changes

- Fix cluster starvation when wait for minimum number of workers is enabled. (#155)
- Fix backup of queries blocked waiting for minimum number of workers. (#155)
- Fix failure when preparing statements that contain a quoted reserved word as a table name. (#80)
- Fix query failure when spilling is triggered during certain phases of query execution. (#164)
- Fix `SHOW CREATE VIEW` output to preserve table name quoting. (#80)
- Add Elasticsearch Connector. (#118)
- Add support for `boolean` type to `approx_distinct()`. (#82)
- Add support for boolean columns to `EXPLAIN` with type `IO`. (#157)
- Add `SphericalGeography` type and related geospatial functions. (#166)
- Remove deprecated system memory pool. (#168)
- Improve query performance for certain queries involving `ROLLUP`. (#105)

## CLI Changes

- Add `--trace-token` option to set the trace token. (#117)
- Display spilled data size as part of debug information. (#161)

## Web UI Changes

- Add spilled data size to query details page. (#161)

## Security Changes

- Add `http.server.authentication.krb5.principal-hostname` configuration option to set the hostname for the Kerberos service principal. (#146, #153)
- Add support for client-provided extra credentials that can be utilized by connectors. (#124)

## Hive Connector Changes

- Fix Parquet predicate pushdown for `smallint`, `tinyint` types. (#131)
- Add support for Google Cloud Storage (GCS). Credentials can be provided globally using the `hive.gcs.json-key-file-path` configuration property, or as a client-provided extra credential named `hive.gcs.oauth` if the `hive.gcs.use-access-token` configuration property is enabled. (#124)
- Allow creating tables with the `external_location` property pointing to an empty S3 directory. (#75)
- Reduce GC pressure from Parquet reader by constraining the maximum column read size. (#58)
- Reduce network utilization and latency for S3 when reading ORC or Parquet. (#142)

## Kafka Connector Changes

- Fix query failure when reading `information_schema.columns` without an equality condition on `table_name`. (#120)

## Redis Connector Changes

- Fix query failure when reading `information_schema.columns` without an equality condition on `table_name`. (#120)

## SPI Changes

- Include query peak task user memory in `QueryCreatedEvent` and `QueryCompletedEvent`. (#163)
- Include plan node cost and statistics estimates in `QueryCompletedEvent`. (#134)
- Include physical and internal network input data size in `QueryCompletedEvent`. (#133)