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dd0bc472e3
* refactor(database): use SupersetResultSet on SqlaTable.get_df() * lint * change cypress test
91 lines
3.3 KiB
Python
91 lines
3.3 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 datetime import datetime
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from typing import Any, List, Optional, Tuple, TYPE_CHECKING
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from pytz import _FixedOffset # type: ignore
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from sqlalchemy.dialects.postgresql.base import PGInspector
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from superset.db_engine_specs.base import BaseEngineSpec
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from superset.utils import core as utils
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if TYPE_CHECKING:
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# pylint: disable=unused-import
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from superset.models.core import Database # pragma: no cover
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# Replace psycopg2.tz.FixedOffsetTimezone with pytz, which is serializable by PyArrow
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# https://github.com/stub42/pytz/blob/b70911542755aeeea7b5a9e066df5e1c87e8f2c8/src/pytz/reference.py#L25
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class FixedOffsetTimezone(_FixedOffset):
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pass
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class PostgresBaseEngineSpec(BaseEngineSpec):
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""" Abstract class for Postgres 'like' databases """
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engine = ""
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engine_name = "PostgreSQL"
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_time_grain_expressions = {
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None: "{col}",
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"PT1S": "DATE_TRUNC('second', {col})",
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"PT1M": "DATE_TRUNC('minute', {col})",
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"PT1H": "DATE_TRUNC('hour', {col})",
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"P1D": "DATE_TRUNC('day', {col})",
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"P1W": "DATE_TRUNC('week', {col})",
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"P1M": "DATE_TRUNC('month', {col})",
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"P0.25Y": "DATE_TRUNC('quarter', {col})",
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"P1Y": "DATE_TRUNC('year', {col})",
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}
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@classmethod
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def fetch_data(
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cls, cursor: Any, limit: Optional[int] = None
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) -> List[Tuple[Any, ...]]:
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cursor.tzinfo_factory = FixedOffsetTimezone
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if not cursor.description:
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return []
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return super().fetch_data(cursor, limit)
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@classmethod
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def epoch_to_dttm(cls) -> str:
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return "(timestamp 'epoch' + {col} * interval '1 second')"
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class PostgresEngineSpec(PostgresBaseEngineSpec):
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engine = "postgresql"
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max_column_name_length = 63
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try_remove_schema_from_table_name = False
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@classmethod
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def get_table_names(
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cls, database: "Database", inspector: PGInspector, schema: Optional[str]
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) -> List[str]:
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"""Need to consider foreign tables for PostgreSQL"""
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tables = inspector.get_table_names(schema)
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tables.extend(inspector.get_foreign_table_names(schema))
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return sorted(tables)
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@classmethod
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def convert_dttm(cls, target_type: str, dttm: datetime) -> Optional[str]:
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tt = target_type.upper()
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if tt == utils.TemporalType.DATE:
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return f"TO_DATE('{dttm.date().isoformat()}', 'YYYY-MM-DD')"
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if tt == utils.TemporalType.TIMESTAMP:
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return f"""TO_TIMESTAMP('{dttm.isoformat(sep=" ", timespec="microseconds")}', 'YYYY-MM-DD HH24:MI:SS.US')""" # pylint: disable=line-too-long
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return None
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