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108 lines
3.7 KiB
Python
108 lines
3.7 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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from __future__ import annotations
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from datetime import datetime
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from typing import Any, TYPE_CHECKING
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from packaging.version import Version
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from sqlalchemy import types
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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.utils.hashing import hash_from_str
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if TYPE_CHECKING:
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from superset.models.core import Database
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# See https://github.com/apache/superset/pull/25657
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FIXED_ALIAS_IN_SELECT_VERSION = Version("24.1.0")
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class DremioEngineSpec(BaseEngineSpec):
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engine = "dremio"
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engine_name = "Dremio"
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engine_aliases = {"dremio+flight"}
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drivers = {
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"flight": "Arrow Flight driver for Dremio",
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"pyodbc": "ODBC driver for Dremio",
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}
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default_driver = "flight"
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sqlalchemy_uri_placeholder = (
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"dremio+flight://data.dremio.cloud:443/?"
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"Token=<TOKEN>&"
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"UseEncryption=true&"
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"disableCertificateVerification=true"
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)
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_time_grain_expressions = {
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None: "{col}",
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TimeGrain.SECOND: "DATE_TRUNC('second', {col})",
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TimeGrain.MINUTE: "DATE_TRUNC('minute', {col})",
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TimeGrain.HOUR: "DATE_TRUNC('hour', {col})",
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TimeGrain.DAY: "DATE_TRUNC('day', {col})",
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TimeGrain.WEEK: "DATE_TRUNC('week', {col})",
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TimeGrain.MONTH: "DATE_TRUNC('month', {col})",
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TimeGrain.QUARTER: "DATE_TRUNC('quarter', {col})",
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TimeGrain.YEAR: "DATE_TRUNC('year', {col})",
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}
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@classmethod
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def epoch_to_dttm(cls) -> str:
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return "TO_DATE({col})"
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@classmethod
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def get_allows_alias_in_select(cls, database: Database) -> bool:
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"""
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Dremio supports aliases in SELECT statements since version 24.1.0.
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If no version is specified in the DB extra, we assume the Dremio version is post
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24.1.0. This way, as we move forward people don't have to specify a version when
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setting up their databases.
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"""
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version = database.get_extra().get("version")
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if version and Version(version) < FIXED_ALIAS_IN_SELECT_VERSION:
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return False
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return True
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@classmethod
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def convert_dttm(
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cls, target_type: str, dttm: datetime, db_extra: dict[str, Any] | None = None
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) -> str | None:
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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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dttm_formatted = dttm.isoformat(sep=" ", timespec="milliseconds")
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return f"""TO_TIMESTAMP('{dttm_formatted}', 'YYYY-MM-DD HH24:MI:SS.FFF')"""
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return None
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@staticmethod
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def _mutate_label(label: str) -> str:
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"""
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Suffix with the first six characters from the md5 of the label to avoid
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collisions with original column names
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:param label: Expected expression label
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:return: Conditionally mutated label
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"""
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return f"{label}_{hash_from_str(label)[:6]}"
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