feat: Add named Tuple type (xzkostyan#318)

* feat: Add named Tuple type

* fix: flake8

Author: akkuman

clickhouse_sqlalchemy/drivers/compilers/typecompiler.py

@@ -121,10 +121,26 @@ def visit_ipv6(self, type_, **kw):
         return 'IPv6'
 
     def visit_tuple(self, type_, **kw):
-        cols = (
-            self.process(type_api.to_instance(nested_type), **kw)
+        cols = []
+        is_named_type = all([
+            isinstance(nested_type, tuple) and len(nested_type) == 2
             for nested_type in type_.nested_types
-        )
+        ])
+        if is_named_type:
+            for nested_type in type_.nested_types:
+                name = nested_type[0]
+                name_type = nested_type[1]
+                inner_type = self.process(
+                    type_api.to_instance(name_type),
+                    **kw
+                )
+                cols.append(
+                    f'{name} {inner_type}')
+        else:
+            cols = (
+                self.process(type_api.to_instance(nested_type), **kw)
+                for nested_type in type_.nested_types
+            )
         return 'Tuple(%s)' % ', '.join(cols)
 
     def visit_map(self, type_, **kw):

tests/test_ddl.py

@@ -296,6 +296,26 @@ def test_create_table_tuple(self):
             'ENGINE = Memory'
         )
 
+    def test_create_table_named_tuple(self):
+        table = Table(
+            't1', self.metadata(),
+            Column(
+                'x',
+                types.Tuple(
+                    ('name', types.String),
+                    ('value', types.Float32)
+                )
+            ),
+            engines.Memory()
+        )
+
+        self.assertEqual(
+            self.compile(CreateTable(table)),
+            'CREATE TABLE t1 ('
+            'x Tuple(name String, value Float32)) '
+            'ENGINE = Memory'
+        )
+
     @require_server_version(21, 1, 3)
     def test_create_table_map(self):
         table = Table(