superset kylin 源码
superset kylin 代码
文件路径：/superset/db_engine_specs/kylin.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
from superset.db_engine_specs.base import BaseEngineSpec
from superset.utils import core as utils
class KylinEngineSpec(BaseEngineSpec): # pylint: disable=abstract-method
"""Dialect for Apache Kylin"""
engine = "kylin"
engine_name = "Apache Kylin"
_time_grain_expressions = {
None: "{col}",
"PT1S": "CAST(FLOOR(CAST({col} AS TIMESTAMP) TO SECOND) AS TIMESTAMP)",
"PT1M": "CAST(FLOOR(CAST({col} AS TIMESTAMP) TO MINUTE) AS TIMESTAMP)",
"PT1H": "CAST(FLOOR(CAST({col} AS TIMESTAMP) TO HOUR) AS TIMESTAMP)",
"P1D": "CAST(FLOOR(CAST({col} AS TIMESTAMP) TO DAY) AS DATE)",
"P1W": "CAST(FLOOR(CAST({col} AS TIMESTAMP) TO WEEK) AS DATE)",
"P1M": "CAST(FLOOR(CAST({col} AS TIMESTAMP) TO MONTH) AS DATE)",
"P3M": "CAST(FLOOR(CAST({col} AS TIMESTAMP) TO QUARTER) AS DATE)",
"P1Y": "CAST(FLOOR(CAST({col} AS TIMESTAMP) TO YEAR) AS DATE)",
}
@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.DATE:
return f"CAST('{dttm.date().isoformat()}' AS DATE)"
if tt == utils.TemporalType.TIMESTAMP:
datetime_fomatted = dttm.isoformat(sep=" ", timespec="seconds")
return f"""CAST('{datetime_fomatted}' AS TIMESTAMP)"""
return None
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