| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you under the Apache License, Version 2.0 (the |
| # "License"); you may not use this file except in compliance |
| # with the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, |
| # software distributed under the License is distributed on an |
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| # KIND, either express or implied. See the License for the |
| # specific language governing permissions and limitations |
| # under the License. |
| from typing import Any, List, Optional, Tuple |
| |
| from superset.db_engine_specs.base import BaseEngineSpec |
| |
| |
| class ExasolEngineSpec(BaseEngineSpec): # pylint: disable=abstract-method |
| """Engine spec for Exasol""" |
| |
| engine = "exa" |
| engine_name = "Exasol" |
| max_column_name_length = 128 |
| |
| # Exasol's DATE_TRUNC function is PostgresSQL compatible |
| _time_grain_expressions = { |
| None: "{col}", |
| "PT1S": "DATE_TRUNC('second', {col})", |
| "PT1M": "DATE_TRUNC('minute', {col})", |
| "PT1H": "DATE_TRUNC('hour', {col})", |
| "P1D": "DATE_TRUNC('day', {col})", |
| "P1W": "DATE_TRUNC('week', {col})", |
| "P1M": "DATE_TRUNC('month', {col})", |
| "P0.25Y": "DATE_TRUNC('quarter', {col})", |
| "P1Y": "DATE_TRUNC('year', {col})", |
| } |
| |
| @classmethod |
| def fetch_data( |
| cls, cursor: Any, limit: Optional[int] = None |
| ) -> List[Tuple[Any, ...]]: |
| data = super().fetch_data(cursor, limit) |
| # Lists of `pyodbc.Row` need to be unpacked further |
| return cls.pyodbc_rows_to_tuples(data) |