fix(sql): case_when sqla v1.3 backwards compat

machow · Oct 5, 2022 · 9e87fb1 · 9e87fb1
1 parent b11d6a5
commit 9e87fb1
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/siuba/sql/verbs/conditional.py b/siuba/sql/verbs/conditional.py
@@ -27,7 +27,10 @@ def _case_when(__data, cases):
         # handle when expressions
         #if ii+1 == n_items and expr is True:
         #    else_val = val
-        if callable(expr):
+        if expr is True:
+            # note: only sqlalchemy v1.3 requires wrapping in literal
+            whens.append((sql.literal(expr), val))
+        elif callable(expr):
             whens.append((expr(__data), val))
         else:
             whens.append((expr, val))