Add Trino 427 release notes

docs/src/main/sphinx/release.md

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 ```{toctree}
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+release/release-427
 release/release-426
 release/release-425
 release/release-424

docs/src/main/sphinx/release/release-427.md

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+# Release 427 (26 Sep 2023)
+
+## General
+
+* Add support for comparing IPv4 addresses and IPv6 CIDRs with the `contains`
+  function. ({issue}`18497`)
+* Improve performance of `GROUP BY`, `DISTINCT`, and other aggregations. ({issue}`19059`)
+* Fix failure due to exceeding node memory limits with `INSERT` statements. ({issue}`18771`)
+* Fix query hang for certain `LIKE` patterns involving a mix of `%` and `_`. ({issue}`19146`)
+
+## Security
+
+* Ensure access control is checked when accessing table comments. ({issue}`18514`)
+
+## Delta Lake connector
+
+* Add support for reading tables with
+  [deletion vectors](https://docs.delta.io/latest/delta-deletion-vectors.html). ({issue}`16903`)
+* Add support for Delta Lake writer
+  [version 7](https://docs.delta.io/latest/versioning.html#features-by-protocol-version). ({issue}`15873`)
+* Add support for writing columns with the `timestamp(p)` type. ({issue}`16927`)
+* Reduce data read from Parquet files for queries with filters. ({issue}`19032`)
+* Improve performance of writing to Parquet files. ({issue}`19122`)
+* Fix error reading Delta Lake table history when the initial transaction logs
+  have been removed. ({issue}`18845`)
+
+## Elasticsearch connector
+
+* Fix query failure when a `LIKE` clause contains multi-byte characters. ({issue}`18966`)
+
+## Hive connector
+
+* Add support for changing column comments in the Glue catalog. ({issue}`19076`)
+* Reduce data read from Parquet files for queries with filters. ({issue}`19032`)
+* Improve performance of reading text files. ({issue}`18959`)
+* Allow changing a column's type from `double` to `varchar` in Hive tables. ({issue}`18930`)
+* Remove legacy Hive readers and writers. The `*_native_reader_enabled` and
+  `*_native_writer_enabled` session properties and `*.native-reader.enabled` and
+  `*.native-writer.enabled` configuration properties are removed. ({issue}`18241`)
+* Remove support for S3 Select. The `s3_select_pushdown_enabled` session
+  property and the `hive.s3select*` configuration properties are removed. ({issue}`18241`)
+* Remove support for disabling optimized symlink listing. The
+  `optimize_symlink_listing` session property and
+  `hive.optimize-symlink-listing` configuration property are removed. ({issue}`18241`)
+* Fix incompatibility with Hive OpenCSV deserialization. As a result, when the
+  escape character is explicitly set to `"`, a `\` (backslash) must be used
+  instead. ({issue}`18918`)
+* Fix performance regression when reading CSV files on AWS S3. ({issue}`18976`)
+* Fix failure when creating a table with a `varchar(0)` column. ({issue}`18811`)
+
+## Hudi connector
+
+* Fix query failure when reading from Hudi tables with
+  [`instants`](https://hudi.apache.org/docs/concepts/#timeline) that have been
+  replaced. ({issue}`18213`)
+
+## Iceberg connector
+
+* Add support for usage of `date` and `timestamp` arguments in `FOR TIMESTAMP AS
+  OF` expressions. ({issue}`14214`)
+* Add support for using tags with `AS OF VERSION` queries. ({issue}`19111`)
+* Reduce coordinator memory usage when running queries on tables with large
+  metadata. ({issue}`19009`)
+* Reduce data read from Parquet files for queries with filters. ({issue}`19032`)
+* Improve performance of writing to Parquet files. ({issue}`19090`)
+
+## Ignite connector
+
+* Add support for pushing down `UPDATE` statements to Ignite. ({issue}`16445`)
+
+## MariaDB connector
+
+* Add support for pushing down `UPDATE` statements to MariaDB. ({issue}`16445`)
+
+## MongoDB connector
+
+* Fix query failure when mapping MongoDB `Decimal128` values with leading zeros. ({issue}`19068`)
+
+## MySQL connector
+
+* Add support for pushing down `UPDATE` statements to MySQL. ({issue}`16445`)
+* Change mapping for MySQL `TIMESTAMP` types from `timestamp(n)` to
+  `timestamp(n) with time zone`. ({issue}`18470`)
+
+## Oracle connector
+
+* Add support for pushing down `UPDATE` statements to Oracle. ({issue}`16445`)
+* Fix potential query failure when joins are pushed down to Oracle. ({issue}`18924`)
+
+## PostgreSQL connector
+
+* Add support for pushing down `UPDATE` statements to PostgreSQL. ({issue}`16445`)
+
+## Redshift connector
+
+* Add support for pushing down `UPDATE` statements to Redshift. ({issue}`16445`)
+
+## SingleStore connector
+
+* Add support for pushing down `UPDATE` statements to SingleStore. ({issue}`16445`)
+
+## SQL Server connector
+
+* Add support for pushing down `UPDATE` statements to SQL Server. ({issue}`16445`)
+
+## SPI
+
+* Change `BlockBuilder` to no longer extend `Block`. ({issue}`18738`)