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https://github.com/apache/superset.git
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95291facff
* Refactor db_engine_specs into package * Rename bigquery class and add epoch funcs * Fix flake8 errors * Dynamically load all engine specs * Fix linting errors and unit tests * Implement Snowflake epoch time funcs * Implement Teradata epoch time func * Fix presto datasource query and remove unused import * Fix broken datasource query * Add mypy ignore for false positive * Add missing license files * Make create_time_grains_tuple public * Fix flake8 quote * Fix incorrect licence header
66 lines
2.3 KiB
Python
66 lines
2.3 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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# pylint: disable=C,R,W
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from superset.db_engine_specs.base import BaseEngineSpec, LimitMethod
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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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time_grain_functions = {
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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(cls, cursor, limit):
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if not cursor.description:
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return []
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if cls.limit_method == LimitMethod.FETCH_MANY:
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return cursor.fetchmany(limit)
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return cursor.fetchall()
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@classmethod
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def epoch_to_dttm(cls):
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return "(timestamp 'epoch' + {col} * interval '1 second')"
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@classmethod
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def convert_dttm(cls, target_type, dttm):
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return "'{}'".format(dttm.strftime('%Y-%m-%d %H:%M:%S'))
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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(cls, inspector, schema):
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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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