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120 lines
4.3 KiB
Python
120 lines
4.3 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 Any, Optional
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from urllib import parse
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from sqlalchemy import types
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from sqlalchemy.engine.url import URL
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from superset.constants import TimeGrain
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from superset.db_engine_specs.base import BaseEngineSpec
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from superset.db_engine_specs.exceptions import SupersetDBAPIProgrammingError
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class DrillEngineSpec(BaseEngineSpec):
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"""Engine spec for Apache Drill"""
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engine = "drill"
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engine_name = "Apache Drill"
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default_driver = "sadrill"
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supports_dynamic_schema = True
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_time_grain_expressions = {
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None: "{col}",
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TimeGrain.SECOND: "NEARESTDATE({col}, 'SECOND')",
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TimeGrain.MINUTE: "NEARESTDATE({col}, 'MINUTE')",
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TimeGrain.FIFTEEN_MINUTES: "NEARESTDATE({col}, 'QUARTER_HOUR')",
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TimeGrain.THIRTY_MINUTES: "NEARESTDATE({col}, 'HALF_HOUR')",
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TimeGrain.HOUR: "NEARESTDATE({col}, 'HOUR')",
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TimeGrain.DAY: "NEARESTDATE({col}, 'DAY')",
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TimeGrain.WEEK: "NEARESTDATE({col}, 'WEEK_SUNDAY')",
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TimeGrain.MONTH: "NEARESTDATE({col}, 'MONTH')",
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TimeGrain.QUARTER: "NEARESTDATE({col}, 'QUARTER')",
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TimeGrain.YEAR: "NEARESTDATE({col}, 'YEAR')",
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}
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# Returns a function to convert a Unix timestamp in milliseconds to a date
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@classmethod
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def epoch_to_dttm(cls) -> str:
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return cls.epoch_ms_to_dttm().replace("{col}", "({col}*1000)")
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@classmethod
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def epoch_ms_to_dttm(cls) -> str:
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return "TO_DATE({col})"
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@classmethod
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def convert_dttm(
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cls, target_type: str, dttm: datetime, db_extra: Optional[dict[str, Any]] = None
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) -> Optional[str]:
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sqla_type = cls.get_sqla_column_type(target_type)
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if isinstance(sqla_type, types.Date):
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return f"TO_DATE('{dttm.date().isoformat()}', 'yyyy-MM-dd')"
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if isinstance(sqla_type, types.TIMESTAMP):
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datetime_formatted = dttm.isoformat(sep=" ", timespec="seconds")
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return f"""TO_TIMESTAMP('{datetime_formatted}', 'yyyy-MM-dd HH:mm:ss')"""
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return None
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@classmethod
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def adjust_engine_params(
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cls,
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uri: URL,
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connect_args: dict[str, Any],
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catalog: Optional[str] = None,
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schema: Optional[str] = None,
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) -> tuple[URL, dict[str, Any]]:
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if schema:
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uri = uri.set(database=parse.quote(schema.replace(".", "/"), safe=""))
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return uri, connect_args
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@classmethod
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def get_schema_from_engine_params(
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cls,
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sqlalchemy_uri: URL,
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connect_args: dict[str, Any],
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) -> Optional[str]:
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"""
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Return the configured schema.
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"""
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return parse.unquote(sqlalchemy_uri.database).replace("/", ".")
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@classmethod
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def get_url_for_impersonation(
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cls, url: URL, impersonate_user: bool, username: Optional[str]
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) -> URL:
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"""
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Return a modified URL with the username set.
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:param url: SQLAlchemy URL object
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:param impersonate_user: Flag indicating if impersonation is enabled
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:param username: Effective username
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"""
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if impersonate_user and username is not None:
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if url.drivername == "drill+odbc":
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url = url.update_query_dict({"DelegationUID": username})
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elif url.drivername in ["drill+sadrill", "drill+jdbc"]:
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url = url.update_query_dict({"impersonation_target": username})
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else:
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raise SupersetDBAPIProgrammingError(
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f"impersonation is not supported for {url.drivername}"
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)
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return url
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