14 files changed, 228 insertions, 20 deletions

diff --git a/tests/dialects/test_duckdb.py b/tests/dialects/test_duckdb.py
index 240f6f9..54553b3 100644
--- a/tests/dialects/test_duckdb.py
+++ b/tests/dialects/test_duckdb.py
@@ -790,3 +790,11 @@ class TestDuckDB(Validator):
                 "duckdb": "ALTER TABLE db.t1 RENAME TO t2",
             },
         )
+
+    def test_timestamps_with_units(self):
+        self.validate_all(
+            "SELECT w::TIMESTAMP_S, x::TIMESTAMP_MS, y::TIMESTAMP_US, z::TIMESTAMP_NS",
+            write={
+                "duckdb": "SELECT CAST(w AS TIMESTAMP_S), CAST(x AS TIMESTAMP_MS), CAST(y AS TIMESTAMP), CAST(z AS TIMESTAMP_NS)",
+            },
+        )
diff --git a/tests/dialects/test_mysql.py b/tests/dialects/test_mysql.py
index 14a864b..b9d1d26 100644
--- a/tests/dialects/test_mysql.py
+++ b/tests/dialects/test_mysql.py
@@ -65,6 +65,9 @@ class TestMySQL(Validator):
         self.validate_identity(
             "INSERT INTO x VALUES (1, 'a', 2.0) ON DUPLICATE KEY UPDATE x.id = 1"
         )
+        self.validate_identity(
+            "CREATE OR REPLACE VIEW my_view AS SELECT column1 AS `boo`, column2 AS `foo` FROM my_table WHERE column3 = 'some_value' UNION SELECT q.* FROM fruits_table, JSON_TABLE(Fruits, '$[*]' COLUMNS(id VARCHAR(255) PATH '$.$id', value VARCHAR(255) PATH '$.value')) AS q",
+        )
 
         self.validate_all(
             "CREATE TABLE z (a INT) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARACTER SET=utf8 COLLATE=utf8_bin COMMENT='x'",
diff --git a/tests/dialects/test_oracle.py b/tests/dialects/test_oracle.py
index 5572ec1..d92eea5 100644
--- a/tests/dialects/test_oracle.py
+++ b/tests/dialects/test_oracle.py
@@ -234,21 +234,30 @@ MATCH_RECOGNIZE (
 
     def test_json_table(self):
         self.validate_identity(
-            "SELECT * FROM JSON_TABLE(foo FORMAT JSON, 'bla' ERROR ON ERROR NULL ON EMPTY COLUMNS (foo PATH 'bar'))"
+            "SELECT * FROM JSON_TABLE(foo FORMAT JSON, 'bla' ERROR ON ERROR NULL ON EMPTY COLUMNS(foo PATH 'bar'))"
         )
         self.validate_identity(
             "SELECT * FROM JSON_TABLE(foo FORMAT JSON, 'bla' ERROR ON ERROR NULL ON EMPTY COLUMNS foo PATH 'bar')",
-            "SELECT * FROM JSON_TABLE(foo FORMAT JSON, 'bla' ERROR ON ERROR NULL ON EMPTY COLUMNS (foo PATH 'bar'))",
+            "SELECT * FROM JSON_TABLE(foo FORMAT JSON, 'bla' ERROR ON ERROR NULL ON EMPTY COLUMNS(foo PATH 'bar'))",
         )
         self.validate_identity(
             """SELECT
   CASE WHEN DBMS_LOB.GETLENGTH(info) < 32000 THEN DBMS_LOB.SUBSTR(info) END AS info_txt,
   info AS info_clob
 FROM schemaname.tablename ar
-INNER JOIN JSON_TABLE(:emps, '$[*]' COLUMNS (empno NUMBER PATH '$')) jt
+INNER JOIN JSON_TABLE(:emps, '$[*]' COLUMNS(empno NUMBER PATH '$')) jt
   ON ar.empno = jt.empno""",
             pretty=True,
         )
+        self.validate_identity(
+            """SELECT
+  *
+FROM JSON_TABLE(res, '$.info[*]' COLUMNS(
+  tempid NUMBER PATH '$.tempid',
+  NESTED PATH '$.calid[*]' COLUMNS(last_dt PATH '$.last_dt ')
+)) src""",
+            pretty=True,
+        )
 
     def test_connect_by(self):
         start = "START WITH last_name = 'King'"
diff --git a/tests/dialects/test_redshift.py b/tests/dialects/test_redshift.py
index 9f2761f..f182feb 100644
--- a/tests/dialects/test_redshift.py
+++ b/tests/dialects/test_redshift.py
@@ -6,6 +6,18 @@ class TestRedshift(Validator):
     dialect = "redshift"
 
     def test_redshift(self):
+        self.validate_all(
+            "SELECT APPROXIMATE COUNT(DISTINCT y)",
+            read={
+                "spark": "SELECT APPROX_COUNT_DISTINCT(y)",
+            },
+            write={
+                "redshift": "SELECT APPROXIMATE COUNT(DISTINCT y)",
+                "spark": "SELECT APPROX_COUNT_DISTINCT(y)",
+            },
+        )
+        self.validate_identity("SELECT APPROXIMATE AS y")
+
         self.validate_identity(
             "SELECT 'a''b'",
             "SELECT 'a\\'b'",
diff --git a/tests/dialects/test_spark.py b/tests/dialects/test_spark.py
index 0148e55..9bb9d79 100644
--- a/tests/dialects/test_spark.py
+++ b/tests/dialects/test_spark.py
@@ -361,7 +361,18 @@ TBLPROPERTIES (
             "SELECT CAST(123456 AS VARCHAR(3))",
             write={
                 "": "SELECT TRY_CAST(123456 AS TEXT)",
+                "databricks": "SELECT TRY_CAST(123456 AS STRING)",
                 "spark": "SELECT CAST(123456 AS STRING)",
+                "spark2": "SELECT CAST(123456 AS STRING)",
+            },
+        )
+        self.validate_all(
+            "SELECT TRY_CAST('a' AS INT)",
+            write={
+                "": "SELECT TRY_CAST('a' AS INT)",
+                "databricks": "SELECT TRY_CAST('a' AS INT)",
+                "spark": "SELECT TRY_CAST('a' AS INT)",
+                "spark2": "SELECT CAST('a' AS INT)",
             },
         )
         self.validate_all(
diff --git a/tests/dialects/test_teradata.py b/tests/dialects/test_teradata.py
index f3615ff..9dbac8c 100644
--- a/tests/dialects/test_teradata.py
+++ b/tests/dialects/test_teradata.py
@@ -48,6 +48,14 @@ class TestTeradata(Validator):
         self.validate_identity("HELP STATISTICS personnel.employee FROM my_qcd")
 
     def test_create(self):
+        self.validate_identity(
+            "REPLACE VIEW view_b (COL1, COL2) AS LOCKING ROW FOR ACCESS SELECT COL1, COL2 FROM table_b",
+            "CREATE OR REPLACE VIEW view_b (COL1, COL2) AS LOCKING ROW FOR ACCESS SELECT COL1, COL2 FROM table_b",
+        )
+        self.validate_identity(
+            "REPLACE VIEW view_b (COL1, COL2) AS LOCKING ROW FOR ACCESS SELECT COL1, COL2 FROM table_b",
+            "CREATE OR REPLACE VIEW view_b (COL1, COL2) AS LOCKING ROW FOR ACCESS SELECT COL1, COL2 FROM table_b",
+        )
         self.validate_identity("CREATE TABLE x (y INT) PRIMARY INDEX (y) PARTITION BY y INDEX (y)")
         self.validate_identity("CREATE TABLE x (y INT) PARTITION BY y INDEX (y)")
         self.validate_identity(
diff --git a/tests/dialects/test_tsql.py b/tests/dialects/test_tsql.py
index fbd913d..f9a720a 100644
--- a/tests/dialects/test_tsql.py
+++ b/tests/dialects/test_tsql.py
@@ -970,19 +970,19 @@ WHERE
         self.validate_all(
             "TRY_CONVERT(NVARCHAR, x, 121)",
             write={
-                "spark": "CAST(DATE_FORMAT(x, 'yyyy-MM-dd HH:mm:ss.SSSSSS') AS VARCHAR(30))",
+                "spark": "TRY_CAST(DATE_FORMAT(x, 'yyyy-MM-dd HH:mm:ss.SSSSSS') AS VARCHAR(30))",
             },
         )
         self.validate_all(
             "TRY_CONVERT(INT, x)",
             write={
-                "spark": "CAST(x AS INT)",
+                "spark": "TRY_CAST(x AS INT)",
             },
         )
         self.validate_all(
             "TRY_CAST(x AS INT)",
             write={
-                "spark": "CAST(x AS INT)",
+                "spark": "TRY_CAST(x AS INT)",
             },
         )
         self.validate_all(
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";
 
diff --git a/tests/test_executor.py b/tests/test_executor.py
index c6b85c9..721550e 100644
--- a/tests/test_executor.py
+++ b/tests/test_executor.py
@@ -4,6 +4,7 @@ from datetime import date
 from multiprocessing import Pool
 
 import duckdb
+import numpy as np
 import pandas as pd
 from pandas.testing import assert_frame_equal
 
@@ -94,6 +95,11 @@ class TestExecutor(unittest.TestCase):
                     sql, _ = self.sqls[i]
                     a = self.cached_execute(sql)
                     b = pd.DataFrame(table.rows, columns=table.columns)
+
+                    # The executor represents NULL values as None, whereas DuckDB represents them as NaN,
+                    # and so the following is done to silence Pandas' "Mismatched null-like values" warnings
+                    b = b.fillna(value=np.nan)
+
                     assert_frame_equal(a, b, check_dtype=False, check_index_type=False)
 
     def test_execute_callable(self):
diff --git a/tests/test_optimizer.py b/tests/test_optimizer.py
index 8fc3273..c43a84e 100644
--- a/tests/test_optimizer.py
+++ b/tests/test_optimizer.py
@@ -45,6 +45,10 @@ def normalize(expression, **kwargs):
     return optimizer.simplify.simplify(expression)
 
 
+def simplify(expression, **kwargs):
+    return optimizer.simplify.simplify(expression, constant_propagation=True, **kwargs)
+
+
 class TestOptimizer(unittest.TestCase):
     maxDiff = None
 
@@ -271,7 +275,7 @@ class TestOptimizer(unittest.TestCase):
         self.check_file("pushdown_projections", pushdown_projections, schema=self.schema)
 
     def test_simplify(self):
-        self.check_file("simplify", optimizer.simplify.simplify)
+        self.check_file("simplify", simplify)
 
         expression = parse_one("TRUE AND TRUE AND TRUE")
         self.assertEqual(exp.true(), optimizer.simplify.simplify(expression))
@@ -823,6 +827,11 @@ FROM READ_CSV('tests/fixtures/optimizer/tpc-h/nation.csv.gz', 'delimiter', '|')
         self.assertEqual(exp.DataType.Type.ARRAY, expression.selects[0].type.this)
         self.assertEqual(expression.selects[0].type.sql(), "ARRAY<INT>")
 
+        schema = MappingSchema({"t": {"c": "STRUCT<`f` STRING>"}}, dialect="bigquery")
+        expression = annotate_types(parse_one("SELECT t.c FROM t"), schema=schema)
+
+        self.assertEqual(expression.selects[0].type.sql(dialect="bigquery"), "STRUCT<`f` STRING>")
+
     def test_type_annotation_cache(self):
         sql = "SELECT 1 + 1"
         expression = annotate_types(parse_one(sql))
diff --git a/tests/test_schema.py b/tests/test_schema.py
index 626fa11..34c507d 100644
--- a/tests/test_schema.py
+++ b/tests/test_schema.py
@@ -272,3 +272,8 @@ class TestSchema(unittest.TestCase):
             str(ctx.exception),
             "Table z must match the schema's nesting level: 2.",
         )
+
+    def test_has_column(self):
+        schema = MappingSchema({"x": {"c": "int"}})
+        self.assertTrue(schema.has_column("x", exp.column("c")))
+        self.assertFalse(schema.has_column("x", exp.column("k")))