4 files changed, 150 insertions, 13 deletions
diff --git a/tests/fixtures/optimizer/optimizer.sql b/tests/fixtures/optimizer/optimizer.sql
index 4cc62c9..a812bc5 100644
--- a/tests/fixtures/optimizer/optimizer.sql
+++ b/tests/fixtures/optimizer/optimizer.sql
@@ -15,6 +15,35 @@ SELECT
   "q"."x" AS "x"
 FROM UNNEST(ARRAY(1, 2)) AS "q"("x", "y");
 
+# title: explode_outer
+# dialect: spark
+# execute: false
+CREATE OR REPLACE TEMPORARY VIEW latest_boo AS
+SELECT
+    TRIM(split(points, ':')[0]) as points_type,
+    TRIM(split(points, ':')[1]) as points_value
+FROM (
+         SELECT
+             explode_outer(split(object_pointsText, ',')) as points
+         FROM (
+                  SELECT
+                      object_pointstext,
+                  FROM boo
+              )
+         WHERE object_pointstext IS NOT NULL
+     );
+CREATE OR REPLACE TEMPORARY VIEW `latest_boo` AS
+SELECT
+  TRIM(SPLIT(`_q_1`.`points`, ':')[0]) AS `points_type`,
+  TRIM(SPLIT(`_q_1`.`points`, ':')[1]) AS `points_value`
+FROM (
+  SELECT
+    EXPLODE_OUTER(SPLIT(`boo`.`object_pointstext`, ',')) AS `points`
+  FROM `boo` AS `boo`
+  WHERE
+    NOT `boo`.`object_pointstext` IS NULL
+) AS `_q_1`;
+
 # title: Union in CTE
 WITH cte AS (
     (
diff --git a/tests/fixtures/optimizer/pushdown_projections.sql b/tests/fixtures/optimizer/pushdown_projections.sql
index 70fd9b0..8497c5b 100644
--- a/tests/fixtures/optimizer/pushdown_projections.sql
+++ b/tests/fixtures/optimizer/pushdown_projections.sql
@@ -70,6 +70,15 @@ WITH cte AS (SELECT 1 AS x, 3 AS z) SELECT cte.a AS a, cte.z AS z FROM cte AS ct
 WITH cte(x, y, z) AS (SELECT 1, 2, 3) SELECT a, z FROM (SELECT * FROM cte AS cte(b)) AS cte(a);
 WITH cte AS (SELECT 1 AS x, 3 AS z) SELECT cte.a AS a, cte.z AS z FROM (SELECT cte.b AS a, cte.z AS z FROM cte AS cte(b)) AS cte;
 
+WITH y AS (SELECT a FROM x) SELECT 1 FROM y;
+WITH y AS (SELECT 1 AS _ FROM x AS x) SELECT 1 AS "1" FROM y;
+
+WITH y AS (SELECT SUM(a) FROM x) SELECT 1 FROM y;
+WITH y AS (SELECT MAX(1) AS _ FROM x AS x) SELECT 1 AS "1" FROM y;
+
+WITH y AS (SELECT a FROM x GROUP BY a) SELECT 1 FROM y;
+WITH y AS (SELECT 1 AS _ FROM x AS x GROUP BY x.a) SELECT 1 AS "1" FROM y;
+
 --------------------------------------
 -- Unknown Star Expansion
 --------------------------------------
diff --git a/tests/fixtures/optimizer/simplify.sql b/tests/fixtures/optimizer/simplify.sql
index a9ae192..e54170c 100644
--- a/tests/fixtures/optimizer/simplify.sql
+++ b/tests/fixtures/optimizer/simplify.sql
@@ -625,7 +625,7 @@ t0.x = t1.x AND t0.y < t1.y AND t0.y <= t1.y;
 t0.x = t1.x AND t0.y < t1.y AND t0.y <= t1.y;
 
 --------------------------------------
--- Coalesce
+-- COALESCE
 --------------------------------------
 COALESCE(x);
 x;
@@ -669,18 +669,45 @@ a AND b AND (ROW() OVER () = 1 OR ROW() OVER () IS NULL);
 CONCAT(x, y);
 CONCAT(x, y);
 
+CONCAT_WS(sep, x, y);
+CONCAT_WS(sep, x, y);
+
 CONCAT(x);
 x;
 
 CONCAT('a', 'b', 'c');
 'abc';
 
+CONCAT('a', NULL);
+CONCAT('a', NULL);
+
+CONCAT_WS('-', 'a', 'b', 'c');
+'a-b-c';
+
 CONCAT('a', x, y, 'b', 'c');
 CONCAT('a', x, y, 'bc');
 
+CONCAT_WS('-', 'a', x, y, 'b', 'c');
+CONCAT_WS('-', 'a', x, y, 'b-c');
+
 'a' || 'b';
 'ab';
 
+CONCAT_WS('-', 'a');
+'a';
+
+CONCAT_WS('-', x, y);
+CONCAT_WS('-', x, y);
+
+CONCAT_WS('', x, y);
+CONCAT_WS('', x, y);
+
+CONCAT_WS('-', x);
+CONCAT_WS('-', x);
+
+CONCAT_WS(sep, 'a', 'b');
+CONCAT_WS(sep, 'a', 'b');
+
 'a' || 'b' || x;
 CONCAT('ab', x);
 
@@ -837,3 +864,60 @@ x < CAST('2020-01-07' AS DATE);
 
 x - INTERVAL '1' day = CAST(y AS DATE);
 x - INTERVAL '1' day = CAST(y AS DATE);
+
+--------------------------------------
+-- Constant Propagation
+--------------------------------------
+x = 5 AND y = x;
+x = 5 AND y = 5;
+
+5 = x AND y = x;
+y = 5 AND 5 = x;
+
+x = 5 OR y = x;
+x = 5 OR y = x;
+
+(x = 5 AND y = x) OR y = 1;
+(x = 5 AND y = 5) OR y = 1;
+
+t.x = 5 AND y = x;
+t.x = 5 AND y = x;
+
+t.x = 'a' AND y = CONCAT_WS('-', t.x, 'b');
+t.x = 'a' AND y = 'a-b';
+
+x = 5 AND y = x AND y + 1 < 5;
+FALSE;
+
+x = 5 AND x = 6;
+FALSE;
+
+x = 5 AND (y = x OR z = 1);
+x = 5 AND (y = x OR z = 1);
+
+x = 5 AND x + 3 = 8;
+x = 5;
+
+x = 5 AND (SELECT x FROM t WHERE y = 1);
+x = 5 AND (SELECT x FROM t WHERE y = 1);
+
+x = 1 AND y > 0 AND (SELECT z = 5 FROM t WHERE y = 1);
+x = 1 AND y > 0 AND (SELECT z = 5 FROM t WHERE y = 1);
+
+x = 1 AND x = y AND (SELECT z FROM t WHERE a AND (b OR c));
+x = 1 AND (SELECT z FROM t WHERE a AND (b OR c)) AND 1 = y;
+
+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 AND IF(x = 5, FALSE, TRUE);
+x = 1 AND CASE WHEN FALSE THEN FALSE ELSE TRUE END;
+
+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;
diff --git a/tests/fixtures/optimizer/tpc-ds/tpc-ds.sql b/tests/fixtures/optimizer/tpc-ds/tpc-ds.sql
index 2218182..91b553e 100644
--- a/tests/fixtures/optimizer/tpc-ds/tpc-ds.sql
+++ b/tests/fixtures/optimizer/tpc-ds/tpc-ds.sql
@@ -2029,18 +2029,33 @@ JOIN "date_dim" AS "date_dim"
   ON "date_dim"."d_year" = 2001
   AND "store_sales"."ss_sold_date_sk" = "date_dim"."d_date_sk"
 JOIN "household_demographics" AS "household_demographics"
-  ON "customer_demographics"."cd_demo_sk" = "store_sales"."ss_cdemo_sk"
-  AND "customer_demographics"."cd_education_status" = 'Advanced Degree'
-  AND "customer_demographics"."cd_education_status" = 'Primary'
-  AND "customer_demographics"."cd_education_status" = 'Secondary'
-  AND "customer_demographics"."cd_marital_status" = 'D'
-  AND "customer_demographics"."cd_marital_status" = 'M'
-  AND "customer_demographics"."cd_marital_status" = 'U'
-  AND "household_demographics"."hd_dep_count" = 1
-  AND "household_demographics"."hd_dep_count" = 3
-  AND "store_sales"."ss_hdemo_sk" = "household_demographics"."hd_demo_sk"
-  AND "store_sales"."ss_sales_price" <= 100.00
-  AND "store_sales"."ss_sales_price" >= 150.00
+  ON (
+    "customer_demographics"."cd_demo_sk" = "store_sales"."ss_cdemo_sk"
+    AND "customer_demographics"."cd_education_status" = 'Advanced Degree'
+    AND "customer_demographics"."cd_marital_status" = 'U'
+    AND "household_demographics"."hd_dep_count" = 3
+    AND "store_sales"."ss_hdemo_sk" = "household_demographics"."hd_demo_sk"
+    AND "store_sales"."ss_sales_price" <= 150.00
+    AND "store_sales"."ss_sales_price" >= 100.00
+  )
+  OR (
+    "customer_demographics"."cd_demo_sk" = "store_sales"."ss_cdemo_sk"
+    AND "customer_demographics"."cd_education_status" = 'Primary'
+    AND "customer_demographics"."cd_marital_status" = 'M'
+    AND "household_demographics"."hd_dep_count" = 1
+    AND "store_sales"."ss_hdemo_sk" = "household_demographics"."hd_demo_sk"
+    AND "store_sales"."ss_sales_price" <= 100.00
+    AND "store_sales"."ss_sales_price" >= 50.00
+  )
+  OR (
+    "customer_demographics"."cd_demo_sk" = "store_sales"."ss_cdemo_sk"
+    AND "customer_demographics"."cd_education_status" = 'Secondary'
+    AND "customer_demographics"."cd_marital_status" = 'D'
+    AND "household_demographics"."hd_dep_count" = 1
+    AND "store_sales"."ss_hdemo_sk" = "household_demographics"."hd_demo_sk"
+    AND "store_sales"."ss_sales_price" <= 200.00
+    AND "store_sales"."ss_sales_price" >= 150.00
+  )
 JOIN "store" AS "store"
   ON "store"."s_store_sk" = "store_sales"."ss_store_sk";