feat(clickhouse): Add support for quantilesExactExclusive agg func (#6535)

Author: VaggelisD

sqlglot/dialects/clickhouse.py

@@ -471,6 +471,7 @@ class Parser(parser.Parser):
             "quantiles",
             "quantileExact",
             "quantilesExact",
+            "quantilesExactExclusive",
             "quantileExactLow",
             "quantilesExactLow",
             "quantileExactHigh",

tests/dialects/test_clickhouse.py

@@ -672,6 +672,10 @@ def test_clickhouse(self):
         self.validate_identity("currentDatabase()", "CURRENT_DATABASE()")
         self.validate_identity("currentSchemas(TRUE)", "CURRENT_SCHEMAS(TRUE)")
 
+        self.validate_identity(
+            "SELECT quantilesExactExclusive(0.25, 0.5, 0.75)(x) AS y FROM (SELECT number AS x FROM num)"
+        )
+
     def test_clickhouse_values(self):
         ast = self.parse_one("SELECT * FROM VALUES (1, 2, 3)")
         self.assertEqual(len(list(ast.find_all(exp.Tuple))), 4)