Improve docs for table statistics

docs/src/main/sphinx/connector/iceberg.md

@@ -1917,6 +1917,7 @@ ORDER BY _change_ordinal ASC;
 The connector includes a number of performance improvements, detailed in the
 following sections.
 
+(iceberg-table-statistics)=
 ### Table statistics
 
 The Iceberg connector can collect column statistics using {doc}`/sql/analyze`

docs/src/main/sphinx/optimizer/statistics.md

@@ -4,7 +4,9 @@ Trino supports statistics based optimizations for queries. For a query to take
 advantage of these optimizations, Trino must have statistical information for
 the tables in that query.
 
-Table statistics are provided to the query planner by connectors.
+Table statistics are estimates about the stored data. They are provided to the
+query planner by connectors and enable performance improvements for query
+processing.
 
 ## Available statistics
 
@@ -27,6 +29,17 @@ being used and can also vary by table. For example, the
 Hive connector does not currently provide statistics on data size.
 
 Table statistics can be displayed via the Trino SQL interface using the
-{doc}`/sql/show-stats` command. For the Hive connector, refer to the
-{ref}`Hive connector <hive-analyze>` documentation to learn how to update table
-statistics.
+[](/sql/show-stats) command.
+
+Depending on the connector support, table statistics are updated by Trino when
+executing [data management statements](sql-data-management) like `INSERT`,
+`UPDATE`, or `DELETE`. For example, the [Delta Lake
+connector](delta-lake-table-statistics), the [Hive connector](hive-analyze), and
+the [Iceberg connector](iceberg-table-statistics) all support table statistics
+management from Trino. 
+
+You can also initialize statistics collection with the [](/sql/analyze) command.
+This is needed when other systems manipulate the data without Trino, and
+therefore statistics tracked by Trino are out of date. Other connectors rely on
+the underlying data source to manage table statistics or do not support table
+statistics use at all.