chore: import upstream snapshot with attribution

testing/generation/command_docs/synopses/alter_materialized_view.txt

@@ -0,0 +1,32 @@
+ALTER MATERIALIZED VIEW [ IF EXISTS ] $name$
+    $action$ [ , ... ]
+
+ALTER MATERIALIZED VIEW $name$
+    [ NO ] DEPENDS ON EXTENSION $extension_name$
+
+ALTER MATERIALIZED VIEW [ IF EXISTS ] $name$
+    RENAME [ COLUMN ] $column_name$ TO $new_column_name$
+
+ALTER MATERIALIZED VIEW [ IF EXISTS ] $name$
+    RENAME TO $new_name$
+
+ALTER MATERIALIZED VIEW [ IF EXISTS ] $name$
+    SET SCHEMA $new_schema$
+
+ALTER MATERIALIZED VIEW ALL IN TABLESPACE $name$ [ OWNED BY $role_name$ [ , ... ] ]
+    SET TABLESPACE $new_tablespace$ [ NOWAIT ]
+
+where $action$ is:
+
+ALTER [ COLUMN ] $column_name$ SET STATISTICS $integer$ |
+    ALTER [ COLUMN ] $column_name$ SET ( $attribute_option$ = $value$ [ , ... ] ) |
+    ALTER [ COLUMN ] $column_name$ RESET ( $attribute_option$ [ , ... ] ) |
+    ALTER [ COLUMN ] $column_name$ SET STORAGE { PLAIN | EXTERNAL | EXTENDED | MAIN } |
+    ALTER [ COLUMN ] $column_name$ SET COMPRESSION $compression_method$ |
+    CLUSTER ON $index_name$ |
+    SET WITHOUT CLUSTER |
+    SET ACCESS METHOD $new_access_method$ |
+    SET TABLESPACE $new_tablespace$ |
+    SET ( { $storage_parameter$ [ = $value$ ] } [ , ... ] ) |
+    RESET ( $storage_parameter$ [ , ... ] ) |
+    OWNER TO { $new_owner$ | CURRENT_ROLE | CURRENT_USER | SESSION_USER }