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Add Trino 468 release notes #24421

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1 change: 1 addition & 0 deletions docs/src/main/sphinx/release.md
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```{toctree}
:maxdepth: 1

release/release-468
release/release-467
release/release-466
release/release-465
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# Release 468 (17 Dec 2024)

## General

* Add experimental support for [](/udf/python). ({issue}`24378`)
* Add cluster overview to the [](/admin/preview-web-interface). ({issue}`23600`)
* Add new node states `DRAINING` and `DRAINED` to make it possible to reactivate
a draining worker node. ({issue}`24444 `)

## BigQuery connector

* Improve performance when reading external
[BigLake](https://cloud.google.com/bigquery/docs/biglake-intro) tables. ({issue}`21016`)

## Delta Lake connector

* {{breaking}} Reduce coordinator memory usage for the Delta table metadata
cache and enable configuration `delta.metadata.cache-max-retained-size` to
control memory usage. Remove the configuration property
`delta.metadata.cache-size` and increase the default for
`delta.metadata.cache-ttl` to `30m`. ({issue}`24432`)

## Hive connector

* Enable mismatched bucket execution optimization by default. This can be
disabled with `hive.optimize-mismatched-bucket-count` configuration property
and the `optimize_mismatched_bucket_count` session property. ({issue}`23432`)
* Improve performance by deactivating bucket execution when not useful in query
processing. ({issue}`23432`)

## Iceberg connector

* Improve performance when running a join or aggregation on a bucketed table
with bucketed execution. This can be deactivated with the
`iceberg.bucket-execution` configuration property and the
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`bucket_execution_enabled` session property. ({issue}`23432`)
* Deprecate the `iceberg.materialized-views.storage-schema` configuration
property. ({issue}`24398`)
* {{breaking}} Rename the `partitions` column in the `$manifests` metadata table
to `partition_summaries`. ({issue}`24103`)
* Avoid excessive resource usage on coordinator when reading Iceberg system
tables. ({issue}`24396`)

## PostgreSQL connector

* Add support for non-transactional [MERGE statements](/sql/merge). ({issue}`23034`)

## SPI

* Add partitioning push down, which a connector can use to activate optional
partitioning or choose between multiple partitioning strategies. ({issue}`23432`)
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