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