superset duckdb 源码
superset duckdb 代码
文件路径：/superset/db_engine_specs/duckdb.py
# 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 __future__ import annotations
import re
from datetime import datetime
from typing import Any, Dict, List, Optional, Pattern, Tuple, TYPE_CHECKING
from flask_babel import gettext as __
from sqlalchemy.engine.reflection import Inspector
from superset.db_engine_specs.base import BaseEngineSpec
from superset.errors import SupersetErrorType
from superset.utils import core as utils
if TYPE_CHECKING:
# prevent circular imports
from superset.models.core import Database
COLUMN_DOES_NOT_EXIST_REGEX = re.compile("no such column: (?P<column_name>.+)")
class DuckDBEngineSpec(BaseEngineSpec):
engine = "duckdb"
engine_name = "DuckDB"
_time_grain_expressions = {
None: "{col}",
"PT1S": "DATE_TRUNC('second', {col})",
"PT1M": "DATE_TRUNC('minute', {col})",
"PT1H": "DATE_TRUNC('hour', {col})",
"P1D": "DATE_TRUNC('day', {col})",
"P1W": "DATE_TRUNC('week', {col})",
"P1M": "DATE_TRUNC('month', {col})",
"P0.25Y": "DATE_TRUNC('quarter', {col})",
"P1Y": "DATE_TRUNC('year', {col})",
}
custom_errors: Dict[Pattern[str], Tuple[str, SupersetErrorType, Dict[str, Any]]] = {
COLUMN_DOES_NOT_EXIST_REGEX: (
__('We can\'t seem to resolve the column "%(column_name)s"'),
SupersetErrorType.COLUMN_DOES_NOT_EXIST_ERROR,
{},
),
}
@classmethod
def epoch_to_dttm(cls) -> str:
return "datetime({col}, 'unixepoch')"
@classmethod
def convert_dttm(
cls, target_type: str, dttm: datetime, db_extra: Optional[Dict[str, Any]] = None
) -> Optional[str]:
tt = target_type.upper()
if tt in (utils.TemporalType.TEXT, utils.TemporalType.DATETIME):
return f"""'{dttm.isoformat(sep=" ", timespec="microseconds")}'"""
return None
@classmethod
def get_table_names(
cls, database: Database, inspector: Inspector, schema: Optional[str]
) -> List[str]:
return sorted(inspector.get_table_names(schema))
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