Add Trino 438 release notes

docs/src/main/sphinx/release.md

@@ -6,6 +6,7 @@
 ```{toctree}
 :maxdepth: 1
 
+release/release-438
 release/release-437
 release/release-436
 ```

docs/src/main/sphinx/release/release-438.md

@@ -0,0 +1,33 @@
+# Release 438 (31 Jan 2024)
+
+## General
+
+* Add support for using `char` and `varchar` types with the {func}`reduce_agg`
+  function. ({issue}`20452`)
+
+## Delta Lake connector
+
+* Add support for configuring the maximum value count for pages written in
+  Parquet files with the `parquet.writer.page-value-count` configuration
+  property or the `parquet_writer_page_value_count` session property. ({issue}`20171`)
+
+## Hive connector
+
+* Add support for configuring the maximum value count for pages written in
+  Parquet files with the `parquet.writer.page-value-count` configuration
+  property or the `parquet_writer_page_value_count` session property. ({issue}`20171`)
+
+## Iceberg connector
+
+* Add support for the `ALTER COLUMN ... DROP NOT NULL` statement. ({issue}`20315`)
+* Add support for configuring the maximum value count for pages written in
+  Parquet files with the `parquet.writer.page-value-count` configuration
+  property or the `parquet_writer_page_value_count` session property. ({issue}`20171`)
+
+## Pinot connector
+
+* Add support for the `DATE` type. ({issue}`13059`)
+
+## PostgreSQL connector
+
+* Add support for the `ALTER COLUMN ... DROP NOT NULL` statement. ({issue}`20315`)