| # 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 superset.db_engine_specs.base import BaseEngineSpec, LimitMethod |
| |
| |
| class TeradataEngineSpec(BaseEngineSpec): |
| """Dialect for Teradata DB.""" |
| |
| engine = "teradata" |
| engine_name = "Teradata" |
| limit_method = LimitMethod.WRAP_SQL |
| max_column_name_length = 30 # since 14.10 this is 128 |
| |
| _time_grain_expressions = { |
| None: "{col}", |
| "PT1M": "TRUNC(CAST({col} as DATE), 'MI')", |
| "PT1H": "TRUNC(CAST({col} as DATE), 'HH')", |
| "P1D": "TRUNC(CAST({col} as DATE), 'DDD')", |
| "P1W": "TRUNC(CAST({col} as DATE), 'WW')", |
| "P1M": "TRUNC(CAST({col} as DATE), 'MONTH')", |
| "P0.25Y": "TRUNC(CAST({col} as DATE), 'Q')", |
| "P1Y": "TRUNC(CAST({col} as DATE), 'YEAR')", |
| } |
| |
| @classmethod |
| def epoch_to_dttm(cls) -> str: |
| return ( |
| "CAST(((CAST(DATE '1970-01-01' + ({col} / 86400) AS TIMESTAMP(0) " |
| "AT 0)) AT 0) + (({col} MOD 86400) * INTERVAL '00:00:01' " |
| "HOUR TO SECOND) AS TIMESTAMP(0))" |
| ) |