1 files changed, 65 insertions, 2 deletions
diff --git a/tests/fixtures/optimizer/simplify.sql b/tests/fixtures/optimizer/simplify.sql
index e54170c..c53a972 100644
--- a/tests/fixtures/optimizer/simplify.sql
+++ b/tests/fixtures/optimizer/simplify.sql
@@ -911,13 +911,76 @@ t1.a = 39 AND t2.b = t1.a AND t3.c = t2.b;
 t1.a = 39 AND t2.b = 39 AND t3.c = 39;
 
 x = 1 AND CASE WHEN x = 5 THEN FALSE ELSE TRUE END;
-x = 1 AND CASE WHEN FALSE THEN FALSE ELSE TRUE END;
+x = 1;
 
 x = 1 AND IF(x = 5, FALSE, TRUE);
-x = 1 AND CASE WHEN FALSE THEN FALSE ELSE TRUE END;
+x = 1;
+
+x = 1 AND CASE x WHEN 5 THEN FALSE ELSE TRUE END;
+x = 1;
 
 x = y AND CASE WHEN x = 5 THEN FALSE ELSE TRUE END;
 x = y AND CASE WHEN x = 5 THEN FALSE ELSE TRUE END;
 
 x = 1 AND CASE WHEN y = 5 THEN x = z END;
 x = 1 AND CASE WHEN y = 5 THEN 1 = z END;
+
+--------------------------------------
+-- Simplify Conditionals
+--------------------------------------
+IF(TRUE, x, y);
+x;
+
+IF(FALSE, x, y);
+y;
+
+IF(FALSE, x);
+NULL;
+
+IF(NULL, x, y);
+y;
+
+IF(cond, x, y);
+CASE WHEN cond THEN x ELSE y END;
+
+CASE WHEN TRUE THEN x ELSE y END;
+x;
+
+CASE WHEN FALSE THEN x ELSE y END;
+y;
+
+CASE WHEN FALSE THEN x WHEN FALSE THEN y WHEN TRUE THEN z END;
+z;
+
+CASE NULL WHEN NULL THEN x ELSE y END;
+y;
+
+CASE 4 WHEN 1 THEN x WHEN 2 THEN y WHEN 3 THEN z ELSE w END;
+w;
+
+CASE 4 WHEN 1 THEN x WHEN 2 THEN y WHEN 3 THEN z WHEN 4 THEN w END;
+w;
+
+CASE WHEN value = 1 THEN x ELSE y END;
+CASE WHEN value = 1 THEN x ELSE y END;
+
+CASE WHEN FALSE THEN x END;
+NULL;
+
+CASE 1 WHEN 1 + 1 THEN x END;
+NULL;
+
+CASE WHEN cond THEN x ELSE y END;
+CASE WHEN cond THEN x ELSE y END;
+
+CASE WHEN cond THEN x END;
+CASE WHEN cond THEN x END;
+
+CASE x WHEN y THEN z ELSE w END;
+CASE WHEN x = y THEN z ELSE w END;
+
+CASE x WHEN y THEN z END;
+CASE WHEN x = y THEN z END;
+
+CASE x1 + x2 WHEN x3 THEN x4 WHEN x5 + x6 THEN x7 ELSE x8 END;
+CASE WHEN (x1 + x2) = x3 THEN x4 WHEN (x1 + x2) = (x5 + x6) THEN x7 ELSE x8 END;