1 files changed, 415 insertions, 0 deletions
diff --git a/tests/test_expressions.py b/tests/test_expressions.py
new file mode 100644
index 0000000..eaef022
--- /dev/null
+++ b/tests/test_expressions.py
@@ -0,0 +1,415 @@
+import unittest
+
+from sqlglot import alias, exp, parse_one
+
+
+class TestExpressions(unittest.TestCase):
+    def test_arg_key(self):
+        self.assertEqual(parse_one("sum(1)").find(exp.Literal).arg_key, "this")
+
+    def test_depth(self):
+        self.assertEqual(parse_one("x(1)").find(exp.Literal).depth, 1)
+
+    def test_eq(self):
+        self.assertEqual(parse_one("`a`", read="hive"), parse_one('"a"'))
+        self.assertEqual(parse_one("`a`", read="hive"), parse_one('"a"  '))
+        self.assertEqual(parse_one("`a`.b", read="hive"), parse_one('"a"."b"'))
+        self.assertEqual(parse_one("select a, b+1"), parse_one("SELECT a, b + 1"))
+        self.assertEqual(parse_one("`a`.`b`.`c`", read="hive"), parse_one("a.b.c"))
+        self.assertNotEqual(parse_one("a.b.c.d", read="hive"), parse_one("a.b.c"))
+        self.assertEqual(parse_one("a.b.c.d", read="hive"), parse_one("a.b.c.d"))
+        self.assertEqual(parse_one("a + b * c - 1.0"), parse_one("a+b*c-1.0"))
+        self.assertNotEqual(parse_one("a + b * c - 1.0"), parse_one("a + b * c + 1.0"))
+        self.assertEqual(parse_one("a as b"), parse_one("a AS b"))
+        self.assertNotEqual(parse_one("a as b"), parse_one("a"))
+        self.assertEqual(
+            parse_one("ROW() OVER(Partition by y)"),
+            parse_one("ROW() OVER (partition BY y)"),
+        )
+        self.assertEqual(
+            parse_one("TO_DATE(x)", read="hive"), parse_one("ts_or_ds_to_date(x)")
+        )
+
+    def test_find(self):
+        expression = parse_one("CREATE TABLE x STORED AS PARQUET AS SELECT * FROM y")
+        self.assertTrue(expression.find(exp.Create))
+        self.assertFalse(expression.find(exp.Group))
+        self.assertEqual(
+            [table.name for table in expression.find_all(exp.Table)],
+            ["x", "y"],
+        )
+
+    def test_find_all(self):
+        expression = parse_one(
+            """
+            SELECT *
+            FROM (
+                SELECT b.*
+                FROM a.b b
+            ) x
+            JOIN (
+              SELECT c.foo
+              FROM a.c c
+              WHERE foo = 1
+            ) y
+              ON x.c = y.foo
+            CROSS JOIN (
+              SELECT *
+              FROM (
+                SELECT d.bar
+                FROM d
+              ) nested
+            ) z
+              ON x.c = y.foo
+            """
+        )
+
+        self.assertEqual(
+            [table.name for table in expression.find_all(exp.Table)],
+            ["b", "c", "d"],
+        )
+
+        expression = parse_one("select a + b + c + d")
+
+        self.assertEqual(
+            [column.name for column in expression.find_all(exp.Column)],
+            ["d", "c", "a", "b"],
+        )
+        self.assertEqual(
+            [column.name for column in expression.find_all(exp.Column, bfs=False)],
+            ["a", "b", "c", "d"],
+        )
+
+    def test_find_ancestor(self):
+        column = parse_one("select * from foo where (a + 1 > 2)").find(exp.Column)
+        self.assertIsInstance(column, exp.Column)
+        self.assertIsInstance(column.parent_select, exp.Select)
+        self.assertIsNone(column.find_ancestor(exp.Join))
+
+    def test_alias_or_name(self):
+        expression = parse_one(
+            "SELECT a, b AS B, c + d AS e, *, 'zz', 'zz' AS z FROM foo as bar, baz"
+        )
+        self.assertEqual(
+            [e.alias_or_name for e in expression.expressions],
+            ["a", "B", "e", "*", "zz", "z"],
+        )
+        self.assertEqual(
+            [e.alias_or_name for e in expression.args["from"].expressions],
+            ["bar", "baz"],
+        )
+
+        expression = parse_one(
+            """
+            WITH first AS (SELECT * FROM foo),
+                 second AS (SELECT * FROM bar)
+            SELECT * FROM first, second, (SELECT * FROM baz) AS third
+        """
+        )
+
+        self.assertEqual(
+            [e.alias_or_name for e in expression.args["with"].expressions],
+            ["first", "second"],
+        )
+
+        self.assertEqual(
+            [e.alias_or_name for e in expression.args["from"].expressions],
+            ["first", "second", "third"],
+        )
+
+    def test_named_selects(self):
+        expression = parse_one(
+            "SELECT a, b AS B, c + d AS e, *, 'zz', 'zz' AS z FROM foo as bar, baz"
+        )
+        self.assertEqual(expression.named_selects, ["a", "B", "e", "*", "zz", "z"])
+
+        expression = parse_one(
+            """
+            WITH first AS (SELECT * FROM foo)
+            SELECT foo.bar, foo.baz as bazz, SUM(x) FROM first
+        """
+        )
+        self.assertEqual(expression.named_selects, ["bar", "bazz"])
+
+        expression = parse_one(
+            """
+            SELECT foo, bar FROM first
+            UNION SELECT "ss" as foo, bar FROM second
+            UNION ALL SELECT foo, bazz FROM third
+        """
+        )
+        self.assertEqual(expression.named_selects, ["foo", "bar"])
+
+    def test_selects(self):
+        expression = parse_one("SELECT FROM x")
+        self.assertEqual(expression.selects, [])
+
+        expression = parse_one("SELECT a FROM x")
+        self.assertEqual([s.sql() for s in expression.selects], ["a"])
+
+        expression = parse_one("SELECT a, b FROM x")
+        self.assertEqual([s.sql() for s in expression.selects], ["a", "b"])
+
+    def test_alias_column_names(self):
+        expression = parse_one("SELECT * FROM (SELECT * FROM x) AS y")
+        subquery = expression.find(exp.Subquery)
+        self.assertEqual(subquery.alias_column_names, [])
+
+        expression = parse_one("SELECT * FROM (SELECT * FROM x) AS y(a)")
+        subquery = expression.find(exp.Subquery)
+        self.assertEqual(subquery.alias_column_names, ["a"])
+
+        expression = parse_one("SELECT * FROM (SELECT * FROM x) AS y(a, b)")
+        subquery = expression.find(exp.Subquery)
+        self.assertEqual(subquery.alias_column_names, ["a", "b"])
+
+        expression = parse_one("WITH y AS (SELECT * FROM x) SELECT * FROM y")
+        cte = expression.find(exp.CTE)
+        self.assertEqual(cte.alias_column_names, [])
+
+        expression = parse_one("WITH y(a, b) AS (SELECT * FROM x) SELECT * FROM y")
+        cte = expression.find(exp.CTE)
+        self.assertEqual(cte.alias_column_names, ["a", "b"])
+
+    def test_ctes(self):
+        expression = parse_one("SELECT a FROM x")
+        self.assertEqual(expression.ctes, [])
+
+        expression = parse_one("WITH x AS (SELECT a FROM y) SELECT a FROM x")
+        self.assertEqual([s.sql() for s in expression.ctes], ["x AS (SELECT a FROM y)"])
+
+    def test_hash(self):
+        self.assertEqual(
+            {
+                parse_one("select a.b"),
+                parse_one("1+2"),
+                parse_one('"a".b'),
+                parse_one("a.b.c.d"),
+            },
+            {
+                parse_one("select a.b"),
+                parse_one("1+2"),
+                parse_one('"a"."b"'),
+                parse_one("a.b.c.d"),
+            },
+        )
+
+    def test_sql(self):
+        self.assertEqual(parse_one("x + y * 2").sql(), "x + y * 2")
+        self.assertEqual(
+            parse_one('select "x"').sql(dialect="hive", pretty=True), "SELECT\n  `x`"
+        )
+        self.assertEqual(
+            parse_one("X + y").sql(identify=True, normalize=True), '"x" + "y"'
+        )
+        self.assertEqual(
+            parse_one("SUM(X)").sql(identify=True, normalize=True), 'SUM("x")'
+        )
+
+    def test_transform_with_arguments(self):
+        expression = parse_one("a")
+
+        def fun(node, alias_=True):
+            if alias_:
+                return parse_one("a AS a")
+            return node
+
+        transformed_expression = expression.transform(fun)
+        self.assertEqual(transformed_expression.sql(dialect="presto"), "a AS a")
+
+        transformed_expression_2 = expression.transform(fun, alias_=False)
+        self.assertEqual(transformed_expression_2.sql(dialect="presto"), "a")
+
+    def test_transform_simple(self):
+        expression = parse_one("IF(a > 0, a, b)")
+
+        def fun(node):
+            if isinstance(node, exp.Column) and node.name == "a":
+                return parse_one("c - 2")
+            return node
+
+        actual_expression_1 = expression.transform(fun)
+        self.assertEqual(
+            actual_expression_1.sql(dialect="presto"), "IF(c - 2 > 0, c - 2, b)"
+        )
+        self.assertIsNot(actual_expression_1, expression)
+
+        actual_expression_2 = expression.transform(fun, copy=False)
+        self.assertEqual(
+            actual_expression_2.sql(dialect="presto"), "IF(c - 2 > 0, c - 2, b)"
+        )
+        self.assertIs(actual_expression_2, expression)
+
+        with self.assertRaises(ValueError):
+            parse_one("a").transform(lambda n: None)
+
+    def test_transform_no_infinite_recursion(self):
+        expression = parse_one("a")
+
+        def fun(node):
+            if isinstance(node, exp.Column) and node.name == "a":
+                return parse_one("FUN(a)")
+            return node
+
+        self.assertEqual(expression.transform(fun).sql(), "FUN(a)")
+
+    def test_transform_multiple_children(self):
+        expression = parse_one("SELECT * FROM x")
+
+        def fun(node):
+            if isinstance(node, exp.Star):
+                return [parse_one(c) for c in ["a", "b"]]
+            return node
+
+        self.assertEqual(expression.transform(fun).sql(), "SELECT a, b FROM x")
+
+    def test_replace(self):
+        expression = parse_one("SELECT a, b FROM x")
+        expression.find(exp.Column).replace(parse_one("c"))
+        self.assertEqual(expression.sql(), "SELECT c, b FROM x")
+        expression.find(exp.Table).replace(parse_one("y"))
+        self.assertEqual(expression.sql(), "SELECT c, b FROM y")
+
+    def test_walk(self):
+        expression = parse_one("SELECT * FROM (SELECT * FROM x)")
+        self.assertEqual(len(list(expression.walk())), 9)
+        self.assertEqual(len(list(expression.walk(bfs=False))), 9)
+        self.assertTrue(
+            all(isinstance(e, exp.Expression) for e, _, _ in expression.walk())
+        )
+        self.assertTrue(
+            all(isinstance(e, exp.Expression) for e, _, _ in expression.walk(bfs=False))
+        )
+
+    def test_functions(self):
+        self.assertIsInstance(parse_one("ABS(a)"), exp.Abs)
+        self.assertIsInstance(parse_one("APPROX_DISTINCT(a)"), exp.ApproxDistinct)
+        self.assertIsInstance(parse_one("ARRAY(a)"), exp.Array)
+        self.assertIsInstance(parse_one("ARRAY_AGG(a)"), exp.ArrayAgg)
+        self.assertIsInstance(parse_one("ARRAY_CONTAINS(a, 'a')"), exp.ArrayContains)
+        self.assertIsInstance(parse_one("ARRAY_SIZE(a)"), exp.ArraySize)
+        self.assertIsInstance(parse_one("AVG(a)"), exp.Avg)
+        self.assertIsInstance(parse_one("CEIL(a)"), exp.Ceil)
+        self.assertIsInstance(parse_one("CEILING(a)"), exp.Ceil)
+        self.assertIsInstance(parse_one("COALESCE(a, b)"), exp.Coalesce)
+        self.assertIsInstance(parse_one("COUNT(a)"), exp.Count)
+        self.assertIsInstance(parse_one("DATE_ADD(a, 1)"), exp.DateAdd)
+        self.assertIsInstance(parse_one("DATE_DIFF(a, 2)"), exp.DateDiff)
+        self.assertIsInstance(parse_one("DATE_STR_TO_DATE(a)"), exp.DateStrToDate)
+        self.assertIsInstance(parse_one("DAY(a)"), exp.Day)
+        self.assertIsInstance(parse_one("EXP(a)"), exp.Exp)
+        self.assertIsInstance(parse_one("FLOOR(a)"), exp.Floor)
+        self.assertIsInstance(parse_one("GREATEST(a, b)"), exp.Greatest)
+        self.assertIsInstance(parse_one("IF(a, b, c)"), exp.If)
+        self.assertIsInstance(parse_one("INITCAP(a)"), exp.Initcap)
+        self.assertIsInstance(parse_one("JSON_EXTRACT(a, '$.name')"), exp.JSONExtract)
+        self.assertIsInstance(
+            parse_one("JSON_EXTRACT_SCALAR(a, '$.name')"), exp.JSONExtractScalar
+        )
+        self.assertIsInstance(parse_one("LEAST(a, b)"), exp.Least)
+        self.assertIsInstance(parse_one("LN(a)"), exp.Ln)
+        self.assertIsInstance(parse_one("LOG10(a)"), exp.Log10)
+        self.assertIsInstance(parse_one("MAX(a)"), exp.Max)
+        self.assertIsInstance(parse_one("MIN(a)"), exp.Min)
+        self.assertIsInstance(parse_one("MONTH(a)"), exp.Month)
+        self.assertIsInstance(parse_one("POW(a, 2)"), exp.Pow)
+        self.assertIsInstance(parse_one("POWER(a, 2)"), exp.Pow)
+        self.assertIsInstance(parse_one("QUANTILE(a, 0.90)"), exp.Quantile)
+        self.assertIsInstance(parse_one("REGEXP_LIKE(a, 'test')"), exp.RegexpLike)
+        self.assertIsInstance(parse_one("REGEXP_SPLIT(a, 'test')"), exp.RegexpSplit)
+        self.assertIsInstance(parse_one("ROUND(a)"), exp.Round)
+        self.assertIsInstance(parse_one("ROUND(a, 2)"), exp.Round)
+        self.assertIsInstance(parse_one("SPLIT(a, 'test')"), exp.Split)
+        self.assertIsInstance(parse_one("STR_POSITION(a, 'test')"), exp.StrPosition)
+        self.assertIsInstance(parse_one("STR_TO_UNIX(a, 'format')"), exp.StrToUnix)
+        self.assertIsInstance(parse_one("STRUCT_EXTRACT(a, 'test')"), exp.StructExtract)
+        self.assertIsInstance(parse_one("SUM(a)"), exp.Sum)
+        self.assertIsInstance(parse_one("SQRT(a)"), exp.Sqrt)
+        self.assertIsInstance(parse_one("STDDEV(a)"), exp.Stddev)
+        self.assertIsInstance(parse_one("STDDEV_POP(a)"), exp.StddevPop)
+        self.assertIsInstance(parse_one("STDDEV_SAMP(a)"), exp.StddevSamp)
+        self.assertIsInstance(parse_one("TIME_TO_STR(a, 'format')"), exp.TimeToStr)
+        self.assertIsInstance(parse_one("TIME_TO_TIME_STR(a)"), exp.Cast)
+        self.assertIsInstance(parse_one("TIME_TO_UNIX(a)"), exp.TimeToUnix)
+        self.assertIsInstance(parse_one("TIME_STR_TO_DATE(a)"), exp.TimeStrToDate)
+        self.assertIsInstance(parse_one("TIME_STR_TO_TIME(a)"), exp.TimeStrToTime)
+        self.assertIsInstance(parse_one("TIME_STR_TO_UNIX(a)"), exp.TimeStrToUnix)
+        self.assertIsInstance(parse_one("TS_OR_DS_ADD(a, 1, 'day')"), exp.TsOrDsAdd)
+        self.assertIsInstance(parse_one("TS_OR_DS_TO_DATE(a)"), exp.TsOrDsToDate)
+        self.assertIsInstance(parse_one("TS_OR_DS_TO_DATE_STR(a)"), exp.Substring)
+        self.assertIsInstance(parse_one("UNIX_TO_STR(a, 'format')"), exp.UnixToStr)
+        self.assertIsInstance(parse_one("UNIX_TO_TIME(a)"), exp.UnixToTime)
+        self.assertIsInstance(parse_one("UNIX_TO_TIME_STR(a)"), exp.UnixToTimeStr)
+        self.assertIsInstance(parse_one("VARIANCE(a)"), exp.Variance)
+        self.assertIsInstance(parse_one("VARIANCE_POP(a)"), exp.VariancePop)
+        self.assertIsInstance(parse_one("YEAR(a)"), exp.Year)
+
+    def test_column(self):
+        dot = parse_one("a.b.c")
+        column = dot.this
+        self.assertEqual(column.table, "a")
+        self.assertEqual(column.name, "b")
+        self.assertEqual(dot.text("expression"), "c")
+
+        column = parse_one("a")
+        self.assertEqual(column.name, "a")
+        self.assertEqual(column.table, "")
+
+        fields = parse_one("a.b.c.d")
+        self.assertIsInstance(fields, exp.Dot)
+        self.assertEqual(fields.text("expression"), "d")
+        self.assertEqual(fields.this.text("expression"), "c")
+        column = fields.find(exp.Column)
+        self.assertEqual(column.name, "b")
+        self.assertEqual(column.table, "a")
+
+        column = parse_one("a[0].b")
+        self.assertIsInstance(column, exp.Dot)
+        self.assertIsInstance(column.this, exp.Bracket)
+        self.assertIsInstance(column.this.this, exp.Column)
+
+        column = parse_one("a.*")
+        self.assertIsInstance(column, exp.Column)
+        self.assertIsInstance(column.this, exp.Star)
+        self.assertIsInstance(column.args["table"], exp.Identifier)
+        self.assertEqual(column.table, "a")
+
+        self.assertIsInstance(parse_one("*"), exp.Star)
+
+    def test_text(self):
+        column = parse_one("a.b.c")
+        self.assertEqual(column.text("expression"), "c")
+        self.assertEqual(column.text("y"), "")
+        self.assertEqual(parse_one("select * from x.y").find(exp.Table).text("db"), "x")
+        self.assertEqual(parse_one("select *").text("this"), "")
+        self.assertEqual(parse_one("1 + 1").text("this"), "1")
+        self.assertEqual(parse_one("'a'").text("this"), "a")
+
+    def test_alias(self):
+        self.assertEqual(alias("foo", "bar").sql(), "foo AS bar")
+        self.assertEqual(alias("foo", "bar-1").sql(), 'foo AS "bar-1"')
+        self.assertEqual(alias("foo", "bar_1").sql(), "foo AS bar_1")
+        self.assertEqual(alias("foo * 2", "2bar").sql(), 'foo * 2 AS "2bar"')
+        self.assertEqual(alias('"foo"', "_bar").sql(), '"foo" AS "_bar"')
+        self.assertEqual(alias("foo", "bar", quoted=True).sql(), 'foo AS "bar"')
+
+    def test_unit(self):
+        unit = parse_one("timestamp_trunc(current_timestamp, week(thursday))")
+        self.assertIsNotNone(unit.find(exp.CurrentTimestamp))
+        week = unit.find(exp.Week)
+        self.assertEqual(week.this, exp.Var(this="thursday"))
+
+    def test_identifier(self):
+        self.assertTrue(exp.to_identifier('"x"').quoted)
+        self.assertFalse(exp.to_identifier("x").quoted)
+
+    def test_function_normalizer(self):
+        self.assertEqual(
+            parse_one("HELLO()").sql(normalize_functions="lower"), "hello()"
+        )
+        self.assertEqual(
+            parse_one("hello()").sql(normalize_functions="upper"), "HELLO()"
+        )
+        self.assertEqual(parse_one("heLLO()").sql(normalize_functions=None), "heLLO()")
+        self.assertEqual(parse_one("SUM(x)").sql(normalize_functions="lower"), "sum(x)")
+        self.assertEqual(parse_one("sum(x)").sql(normalize_functions="upper"), "SUM(x)")