Add histogram statistic documentation

presto-docs/src/main/sphinx/admin/properties.rst

@@ -828,6 +828,17 @@ Optimizer Properties
     Enable analysis and propagation of logical properties like distinct keys or cardinality among the nodes of
     a query plan. The optimizer may then use these properties to perform various optimizations.
 
+``optimizer.use-histograms``
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+    * **Type:** ``boolean``
+    * **Default Value:** ``false``
+
+    Enables the optimizer uses histograms when available to perform the cost estimate calculations
+    during query optimization. This parameter does not prevent histograms from being collected by
+    ``ANALYZE``, but rather prevents them from being used during query optimization. This behavior
+    can be controlled on a per-query basis using the ``optimizer_use_histograms`` session property.
+
 Planner Properties
 ------------------
 

presto-docs/src/main/sphinx/optimizer/statistics.rst

@@ -6,8 +6,8 @@ Presto supports statistics based optimizations for queries. For a query to take
 advantage of these optimizations, Presto must have statistical information for
 the tables in that query.
 
-Table statistics are provided to the query planner by connectors.  Currently, the
-only connector that supports statistics is the :doc:`/connector/hive`.
+Table statistics are provided to the query planner by connectors. Support for
+statistics is dependent upon the connector.
 
 Table Layouts
 -------------
@@ -41,12 +41,13 @@ The following statistics are available in Presto:
    * **distinct value count**: the number of distinct values
    * **low value**: the smallest value in the column
    * **high value**: the largest value in the column
+   * **histogram**: A connector-dependent histogram data structure.
 
 The set of statistics available for a particular query depends on the connector
 being used and can also vary by table or even by table layout. For example, the
 Hive connector does not currently provide statistics on data size.
 
-Table statistics can be displayed via the Presto SQL interface using the
+Table statistics can be displayed via a SQL statement 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.