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74 lines
2.2 KiB
Python
74 lines
2.2 KiB
Python
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# Copyright 2021 Collate
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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# http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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Population Standard deviation Metric definition
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"""
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from sqlalchemy.ext.compiler import compiles
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from sqlalchemy.sql.functions import FunctionElement
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from metadata.generated.schema.entity.services.databaseService import (
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DatabaseServiceType,
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)
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from metadata.orm_profiler.metrics.core import CACHE, StaticMetric, _label
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from metadata.orm_profiler.orm.registry import SQLALCHEMY_NUMERIC
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from metadata.orm_profiler.utils import logger
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logger = logger()
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class StdDevFn(FunctionElement):
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name = __qualname__
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inherit_cache = CACHE
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@compiles(StdDevFn)
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def _(element, compiler, **kw):
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return "STDDEV_POP(%s)" % compiler.process(element.clauses, **kw)
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@compiles(StdDevFn, DatabaseServiceType.MSSQL.value.lower())
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def _(element, compiler, **kw):
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return "STDEVP(%s)" % compiler.process(element.clauses, **kw)
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@compiles(StdDevFn, "sqlite") # Needed for unit tests
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def _(element, compiler, **kw):
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"""
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This actually returns the squared STD, but as
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it is only required for tests we can live with it.
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"""
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proc = compiler.process(element.clauses, **kw)
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return "AVG(%s * %s) - AVG(%s) * AVG(%s)" % ((proc,) * 4)
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class StdDev(StaticMetric):
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"""
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STD Metric
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Given a column, return the Standard Deviation value.
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"""
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def metric_type(self):
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return float
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@_label
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def fn(self):
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if self.col.type.__class__ not in SQLALCHEMY_NUMERIC:
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logger.info(
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f"{self.col} has type {self.col.type}, which is not listed as numeric."
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+ " We won't compute STDDEV for it."
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)
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return None
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return StdDevFn(self.col)
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