add a test

ydb/tests/olap/scenario/conftest.py

@@ -19,7 +19,8 @@ def get_suite_name(cls):
 
     @classmethod
     def setup_class(cls):
-        ScenarioTestHelper(None).remove_path(cls.get_suite_name())
+        if not external_param_is_true('reuse-tables'):
+            ScenarioTestHelper(None).remove_path(cls.get_suite_name())
 
     @classmethod
     def teardown_class(cls):

ydb/tests/olap/scenario/helpers/data_generators.py

@@ -42,14 +42,30 @@ def next_row(self) -> None:
         pass
 
 
-class ColumnValueGeneratorNull(IColumnValueGenerator):
-    """NULL column value generator.
+class ColumnValueGeneratorConst(IColumnValueGenerator):
+    """Const column value generator.
 
-    Allways generate NULL value."""
+    Allways generate specified value."""
+
+    def __init__(self, value: Any) -> None:
+        """Constructor.
+
+         Args:
+            value: Value to generate.
+        Example:
+            DataGeneratorPerColumn(
+                self.schema2, 10,
+                ColumnValueGeneratorDefault(init_value=10))
+                    .with_column('not_level', ColumnValueGeneratorConst(42)
+            )
+        """
+
+        super().__init__()
+        self._value = value
 
     @override
-    def generate_value(column: ScenarioTestHelper.Column) -> Any:
-        return None
+    def generate_value(self, column: ScenarioTestHelper.Column) -> Any:
+        return self._value
 
 
 class ColumnValueGeneratorRandom(IColumnValueGenerator):

ydb/tests/olap/scenario/helpers/table_helper.py

@@ -218,6 +218,69 @@ def title(self) -> str:
         return f'drop column `{self._column}`'
 
 
+class SetSetting(AlterTableAction):
+    """Set a setting value for a table-like object.
+
+     Table-like objects are Tables and TableStore.
+     See {AlterTableLikeObject}.
+
+    Example:
+        sth = ScenarioTestHelper(ctx)
+        sth.execute_scheme_query(
+            AlterTable('testTable').action(SetSetting('TIERING', 'tiering1))
+        )
+    """
+
+    def __init__(self, setting: str, value_literal: str) -> None:
+        """Constructor.
+
+        Args:
+            column: Name of the column to be deleted."""
+
+        super().__init__()
+        self._setting = setting
+        self._value = value_literal
+
+    @override
+    def to_yql(self) -> str:
+        return f'SET {self._setting} {self._value}'
+
+    @override
+    def title(self) -> str:
+        return f'set {self._setting} = {self._value}'
+
+
+class ResetSetting(AlterTableAction):
+    """Reset value of a setting for a table-like object.
+
+     Table-like objects are Tables and TableStore.
+     See {AlterTableLikeObject}.
+
+    Example:
+        sth = ScenarioTestHelper(ctx)
+        sth.execute_scheme_query(
+            AlterTable('testTable').action(ResetSetting('TIERING'))
+        )
+    """
+
+    def __init__(self, setting: str) -> None:
+        """Constructor.
+
+        Args:
+            setting: Name of altered setting."""
+
+        super().__init__()
+        self._setting = setting
+
+    @override
+    def to_yql(self) -> str:
+        return f'RESET ({self._setting})'
+
+    @override
+    def title(self) -> str:
+        return f'reset {self._setting}'
+
+
 class AlterTableLikeObject(ScenarioTestHelper.IYqlble):
     """The base class for all requests to change table-like objects.
 
@@ -277,6 +340,42 @@ def drop_column(self, column: str) -> AlterTableLikeObject:
 
         return self(DropColumn(column))
 
+    def set_tiering(self, tiering_rule: str) -> AlterTableLikeObject:
+        """Set a tiering policy.
+
+        The method is similar to calling {AlterTableLikeObject.action} with a {SetSetting} instance.
+
+        Args:
+            tiering_rule: Name of a TIERING_RULE object.
+
+        Returns:
+            self."""
+
+        return self(SetSetting('TIERING', f'"{tiering_rule}"'))
+
+    def reset_tiering(self) -> AlterTableLikeObject:
+        """Remove a tiering policy.
+
+        The method is similar to calling {AlterTableLikeObject.action} with a {SetSetting} instance.
+
+        Returns:
+            self."""
+
+        return self(ResetSetting('TIERING'))
+
+    def set_ttl(self, interval: str, column: str) -> AlterTableLikeObject:
+        """Set TTL for rows.
+
+        The method is similar to calling {AlterTableLikeObject.action} with a {SetSetting} instance.
+
+        Args:
+            tiering_rule: Name of a TIERING_RULE object.
+
+        Returns:
+            self."""
+
+        return self(SetSetting('TTL', f'Interval("{interval}") ON `{column}`'))
+
     @override
     def params(self) -> Dict[str, str]:
         return {self._type(): self._name, 'actions': ', '.join([a.title() for a in self._actions])}