Add Trino 468 release notes

docs/src/main/sphinx/release.md

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+release/release-468
 release/release-467
 release/release-466
 release/release-465

docs/src/main/sphinx/release/release-468.md

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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
+  `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`)