fix(sqlglot): ensure that sge.Median is only accessed when it exists

ibis/backends/sql/dialects.py

@@ -31,7 +31,6 @@ class Generator(_ClickHouse.Generator):
             sge.ArraySort: rename_func("arraySort"),
             sge.LogicalAnd: rename_func("min"),
             sge.LogicalOr: rename_func("max"),
-            sge.Median: rename_func("median"),
         }
 
         def except_op(self, expression: sge.Except) -> str:
@@ -43,6 +42,10 @@ def intersect_op(self, expression: sge.Intersect) -> str:
             )
 
 
+with contextlib.suppress(AttributeError):
+    ClickHouse.Generator.TRANSFORMS[sge.Median] = rename_func("median")
+
+
 class DataFusion(Postgres):
     class Generator(Postgres.Generator):
         TRANSFORMS = Postgres.Generator.TRANSFORMS.copy() | {
@@ -55,10 +58,13 @@ class Generator(Postgres.Generator):
             sge.Array: rename_func("make_array"),
             sge.ArrayContains: rename_func("array_has"),
             sge.ArraySize: rename_func("array_length"),
-            sge.Median: rename_func("median"),
         }
 
 
+with contextlib.suppress(AttributeError):
+    DataFusion.Generator.TRANSFORMS[sge.Median] = rename_func("median")
+
+
 class Druid(Postgres):
     class Generator(Postgres.Generator):
         TRANSFORMS = Postgres.Generator.TRANSFORMS.copy() | {