superset crate 源码
superset crate 代码
文件路径：/superset/db_engine_specs/crate.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 datetime import datetime
from typing import Any, Dict, Optional, TYPE_CHECKING
from superset.db_engine_specs.base import BaseEngineSpec
from superset.utils import core as utils
if TYPE_CHECKING:
from superset.connectors.sqla.models import TableColumn
class CrateEngineSpec(BaseEngineSpec):
engine = "crate"
engine_name = "CrateDB"
_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})",
"P3M": "DATE_TRUNC('quarter', {col})",
"P1Y": "DATE_TRUNC('year', {col})",
}
@classmethod
def epoch_to_dttm(cls) -> str:
return "{col} * 1000"
@classmethod
def epoch_ms_to_dttm(cls) -> str:
return "{col}"
@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 == utils.TemporalType.TIMESTAMP:
return f"{dttm.timestamp() * 1000}"
return None
@classmethod
def alter_new_orm_column(cls, orm_col: "TableColumn") -> None:
if orm_col.type == "TIMESTAMP":
orm_col.python_date_format = "epoch_ms"
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