Feat: Added a Statistics node #2018

docs/en_US/managing_database_objects.rst

@@ -39,6 +39,7 @@ node, and select *Create Cast...*
    publication_dialog
    schema_dialog
    sequence_dialog
+   statistics_dialog
    subscription_dialog
    synonym_dialog
    trigger_function_dialog

docs/en_US/release_notes_9_16.rst

@@ -29,6 +29,7 @@ New features
   | `Issue #9626 <https://github.com/pgadmin-org/pgadmin4/issues/9626>`_ -  Add support for the TOAST tuple target storage parameter in the Materialized View dialog.
   | `Issue #9646 <https://github.com/pgadmin-org/pgadmin4/issues/9646>`_ -  Make the init container security context in the Helm chart configurable via containerSecurityContext, consistent with the main container.
   | `Issue #9699 <https://github.com/pgadmin-org/pgadmin4/issues/9699>`_ -  Add support for closing a tab with a middle-click on its title.
+  | `Issue #2018 <https://github.com/pgadmin-org/pgadmin4/issues/2018>`_ -  Added support for Extended Statistics objects (CREATE STATISTICS) under the Schema node, with full create, edit, delete, and SQL-generation support for column-based and expression-based statistics on PostgreSQL 14+.
 
 Housekeeping
 ************

docs/en_US/statistics_dialog.rst

@@ -0,0 +1,75 @@
+.. _statistics_dialog:
+
+**************************
+`Statistics Dialog`:index:
+**************************
+
+Use the *Statistics* dialog to define extended statistics on one or more columns
+(or expressions) of a table. Extended statistics let PostgreSQL collect
+correlation data across columns that can significantly improve query-plan
+estimates for queries that filter or group by multiple columns.
+
+Extended statistics require PostgreSQL 14 or later.
+
+The *Statistics* dialog organizes options across the *General* and *Definition*
+tabs. The *SQL* tab displays the SQL command generated by your selections.
+
+.. image:: images/statistics_general.png
+    :alt: Statistics dialog general tab
+    :align: center
+
+Use the fields in the *General* tab to identify the statistics object:
+
+* Use the *Name* field to enter a descriptive name. On PostgreSQL 16 and later,
+  the name is optional — PostgreSQL will auto-generate one if left blank.
+* Use the *Owner* field to select the role that will own the statistics object.
+* Use the *Schema* field to select the schema in which the statistics object
+  will reside.
+* Use the *Comment* field to store an optional note about the statistics object.
+
+Click the *Definition* tab to continue.
+
+.. image:: images/statistics_definition.png
+    :alt: Statistics dialog definition tab
+    :align: center
+
+Use the fields in the *Definition* tab to describe the statistics:
+
+* Use the *Table* field to select the table on which the statistics will be
+  collected. The list is filtered to tables in the selected schema.
+* Use the *Columns* field to select two or more columns. Hold *Ctrl* (or *Cmd*
+  on macOS) to select multiple columns. At least two columns are required when
+  collecting column-based statistics.
+* Use the *Expressions* field to enter one or more SQL expressions separated by
+  commas (e.g. ``lower(col1), (col1 + col2)``). Specify expressions instead of
+  columns when you want statistics on derived values.
+* Use the *Statistics types* field to choose which kinds of extended statistics
+  to collect:
+
+  * *N-distinct* — estimates the number of distinct value combinations across
+    the selected columns or expressions.
+  * *Dependencies* — detects functional dependencies between columns, improving
+    estimates for queries with correlated ``WHERE`` clauses.
+  * *MCV (Most Common Values)* — records the most common combinations of values,
+    available on PostgreSQL 12 and later.
+
+Click the *SQL* tab to continue.
+
+
+Your entries in the *Statistics* dialog generate a SQL command (see an example
+below). Use the *SQL* tab for review; revisit or switch tabs to make any changes.
+
+Example
+*******
+
+The following is an example of the SQL command generated by user selections in
+the *Statistics* dialog:
+
+.. image:: images/statistics_sql.png
+    :alt: Statistics dialog SQL tab
+    :align: center
+
+* Click the *Info* button (i) to access online help.
+* Click the *Save* button to save work.
+* Click the *Close* button to exit without saving work.
+* Click the *Reset* button to restore configuration parameters.

web/pgadmin/browser/server_groups/servers/databases/schemas/__init__.py

@@ -157,6 +157,9 @@ def register(self, app, options):
         from .sequences import blueprint as module
         self.submodules.append(module)
 
+        from .statistics import blueprint as module
+        self.submodules.append(module)
+
         from .synonyms import blueprint as module
         self.submodules.append(module)