fixes

posthog/api/cohort.py

@@ -155,7 +155,7 @@ def create(self, validated_data: Dict, *args: Any, **kwargs: Any) -> Cohort:
         if not validated_data.get("is_static"):
             validated_data["is_calculating"] = True
         if validated_data.get("query") and validated_data.get("filters"):
-            raise ValidationError("Cannot set both query and filters")
+            raise ValidationError("Cannot set both query and filters at the same time.")
 
         cohort = Cohort.objects.create(team_id=self.context["team_id"], **validated_data)
 

posthog/hogql/hogql.py

@@ -15,7 +15,7 @@
 # This is called only from "non-hogql-based" insights to translate HogQL expressions into ClickHouse SQL
 # All the constant string values will be collected into context.values
 def translate_hogql(
-    query: str | ast.Expr,
+    query: str,
     context: HogQLContext,
     dialect: Literal["hogql", "clickhouse"] = "clickhouse",
     table: str = "events",
@@ -33,11 +33,7 @@ def translate_hogql(
             if context.team_id is None:
                 raise ValueError("Cannot translate HogQL for a filter with no team specified")
             context.database = create_hogql_database(context.team_id)
-
-        if isinstance(query, str):
-            node = parse_expr(query, placeholders=placeholders)
-        else:
-            node = query
+        node = parse_expr(query, placeholders=placeholders)
 
         select_query = ast.SelectQuery(select=[node], select_from=ast.JoinExpr(table=ast.Field(chain=[table])))
         if events_table_alias is not None: