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https://github.com/apache/superset.git
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95291facff
* Refactor db_engine_specs into package * Rename bigquery class and add epoch funcs * Fix flake8 errors * Dynamically load all engine specs * Fix linting errors and unit tests * Implement Snowflake epoch time funcs * Implement Teradata epoch time func * Fix presto datasource query and remove unused import * Fix broken datasource query * Add mypy ignore for false positive * Add missing license files * Make create_time_grains_tuple public * Fix flake8 quote * Fix incorrect licence header
43 lines
1.7 KiB
Python
43 lines
1.7 KiB
Python
# Licensed to the Apache Software Foundation (ASF) under one
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# or more contributor license agreements. See the NOTICE file
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# distributed with this work for additional information
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# regarding copyright ownership. The ASF licenses this file
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# to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance
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# with the License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing,
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# software distributed under the License is distributed on an
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# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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# KIND, either express or implied. See the License for the
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# specific language governing permissions and limitations
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# under the License.
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# pylint: disable=C,R,W
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from superset.db_engine_specs.base import BaseEngineSpec, LimitMethod
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class TeradataEngineSpec(BaseEngineSpec):
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"""Dialect for Teradata DB."""
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engine = 'teradata'
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limit_method = LimitMethod.WRAP_SQL
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max_column_name_length = 30 # since 14.10 this is 128
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time_grain_functions = {
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None: '{col}',
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'PT1M': "TRUNC(CAST({col} as DATE), 'MI')",
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'PT1H': "TRUNC(CAST({col} as DATE), 'HH')",
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'P1D': "TRUNC(CAST({col} as DATE), 'DDD')",
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'P1W': "TRUNC(CAST({col} as DATE), 'WW')",
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'P1M': "TRUNC(CAST({col} as DATE), 'MONTH')",
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'P0.25Y': "TRUNC(CAST({col} as DATE), 'Q')",
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'P1Y': "TRUNC(CAST({col} as DATE), 'YEAR')",
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}
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@classmethod
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def epoch_to_dttm(cls):
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return "CAST(((CAST(DATE '1970-01-01' + ({col} / 86400) AS TIMESTAMP(0) " \
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"AT 0)) AT 0) + (({col} MOD 86400) * INTERVAL '00:00:01' " \
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'HOUR TO SECOND) AS TIMESTAMP(0))'
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