superset exasol 源码
superset exasol 代码
文件路径：/superset/db_engine_specs/exasol.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 typing import Any, List, Optional, Tuple
from superset.db_engine_specs.base import BaseEngineSpec
class ExasolEngineSpec(BaseEngineSpec): # pylint: disable=abstract-method
"""Engine spec for Exasol"""
engine = "exa"
engine_name = "Exasol"
max_column_name_length = 128
# Exasol's DATE_TRUNC function is PostgresSQL compatible
_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 fetch_data(
cls, cursor: Any, limit: Optional[int] = None
) -> List[Tuple[Any, ...]]:
data = super().fetch_data(cursor, limit)
# Lists of `pyodbc.Row` need to be unpacked further
return cls.pyodbc_rows_to_tuples(data)
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