ExcludeConstraint literal_compile

ExcludeConstraint correctly uses literal compile
when compiling expression ddl.

Fixes: #9349
Change-Id: I11a994ac46556a972afc696a2baad7ddbdd3de97

1 files changed, 7 insertions, 8 deletions

diff --git a/lib/sqlalchemy/dialects/postgresql/ext.py b/lib/sqlalchemy/dialects/postgresql/ext.py
index 0f5efb1de..22604955d 100644
--- a/lib/sqlalchemy/dialects/postgresql/ext.py
+++ b/lib/sqlalchemy/dialects/postgresql/ext.py
@@ -164,16 +164,15 @@ class ExcludeConstraint(ColumnCollectionConstraint):
         :param \*elements:
 
           A sequence of two tuples of the form ``(column, operator)`` where
-          "column" is a SQL expression element or a raw SQL string, most
-          typically a :class:`_schema.Column` object,
-          and "operator" is a string
-          containing the operator to use.   In order to specify a column name
-          when a  :class:`_schema.Column` object is not available,
-          while ensuring
+          "column" is a SQL expression element or the name of a column as
+          string, most typically a :class:`_schema.Column` object,
+          and "operator" is a string containing the operator to use.
+          In order to specify a column name when a :class:`_schema.Column`
+          object is not available, while ensuring
           that any necessary quoting rules take effect, an ad-hoc
           :class:`_schema.Column` or :func:`_expression.column`
-          object should be
-          used.
+          object should be used. ``column`` may also be a string SQL
+          expression when passed as :func:`_expression.literal_column`
 
         :param name:
           Optional, the in-database name of this constraint.