| # 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 datetime import datetime |
| from typing import Optional |
| |
| from superset.db_engine_specs.base import LimitMethod |
| from superset.db_engine_specs.postgres import PostgresBaseEngineSpec |
| from superset.utils import core as utils |
| |
| |
| class HanaEngineSpec(PostgresBaseEngineSpec): |
| engine = "hana" |
| engine_name = "SAP HANA" |
| limit_method = LimitMethod.WRAP_SQL |
| force_column_alias_quotes = True |
| max_column_name_length = 30 |
| |
| _time_grain_expressions = { |
| None: "{col}", |
| "PT1S": "TO_TIMESTAMP(SUBSTRING(TO_TIMESTAMP({col}),0,20))", |
| "PT1M": "TO_TIMESTAMP(SUBSTRING(TO_TIMESTAMP({col}),0,17) || '00')", |
| "PT1H": "TO_TIMESTAMP(SUBSTRING(TO_TIMESTAMP({col}),0,14) || '00:00')", |
| "P1D": "TO_DATE({col})", |
| "P1M": "TO_DATE(SUBSTRING(TO_DATE({col}),0,7)||'-01')", |
| "P0.25Y": "TO_DATE(SUBSTRING( \ |
| TO_DATE({col}), 0, 5)|| LPAD(CAST((CAST(SUBSTRING(QUARTER( \ |
| TO_DATE({col}), 1), 7, 1) as int)-1)*3 +1 as text),2,'0') ||'-01')", |
| "P1Y": "TO_DATE(YEAR({col})||'-01-01')", |
| } |
| |
| @classmethod |
| def convert_dttm(cls, target_type: str, dttm: datetime) -> Optional[str]: |
| tt = target_type.upper() |
| if tt == utils.TemporalType.DATE: |
| return f"TO_DATE('{dttm.date().isoformat()}', 'YYYY-MM-DD')" |
| if tt == utils.TemporalType.TIMESTAMP: |
| return f"""TO_TIMESTAMP('{dttm |
| .isoformat(timespec="microseconds")}', 'YYYY-MM-DD"T"HH24:MI:SS.ff6')""" |
| return None |