Infinidat/infi.clickhouse_orm
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support decimal fields

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This commit is contained in:
Itai Shirav 2018-10-13 23:19:43 +03:00
parent 658c7b42ee
commit f24749112e
10 changed files with 356 additions and 92 deletions
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2
CHANGELOG.md
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@ -5,6 +5,8 @@ Unreleased
----------
- Bug fix: `QuerySet.count()` ignores slicing
- Bug fix: wrong parentheses when building queries using Q objects
- Support Decimal fields
- Added `Database.add_setting` method
v1.0.2
----------

191
docs/class_reference.md
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@ -24,6 +24,16 @@ created on the ClickHouse server if it does not already exist.
- `autocreate`: automatically create the database if does not exist (unless in readonly mode).
#### add_setting(name, value)
Add a database setting that will be sent with every request.
For example, `db.add_setting("max_execution_time", 10)` will
limit query execution time to 10 seconds.
The name must be string, and the value is converted to string in case
it isn't. To remove a setting, pass `None` as the value.
#### count(model_class, conditions=None)
@ -494,19 +504,41 @@ Returns the instance's column values as a tab-separated line. A newline is not i
infi.clickhouse_orm.fields
--------------------------
### Field
Abstract base class for all field types.
#### Field(default=None, alias=None, materialized=None, readonly=None)
### StringField
### ArrayField
Extends Field
#### StringField(default=None, alias=None, materialized=None, readonly=None)
#### ArrayField(inner_field, default=None, alias=None, materialized=None, readonly=None)
### BaseEnumField
Extends Field
Abstract base class for all enum-type fields.
#### BaseEnumField(enum_cls, default=None, alias=None, materialized=None, readonly=None)
### BaseFloatField
Extends Field
Abstract base class for all float-type fields.
#### BaseFloatField(default=None, alias=None, materialized=None, readonly=None)
### BaseIntField
Extends Field
Abstract base class for all integer-type fields.
#### BaseIntField(default=None, alias=None, materialized=None, readonly=None)
### DateField
@ -523,48 +555,57 @@ Extends Field
#### DateTimeField(default=None, alias=None, materialized=None, readonly=None)
### BaseIntField
### Decimal128Field
Extends DecimalField
#### Decimal128Field(scale, default=None, alias=None, materialized=None, readonly=None)
### Decimal32Field
Extends DecimalField
#### Decimal32Field(scale, default=None, alias=None, materialized=None, readonly=None)
### Decimal64Field
Extends DecimalField
#### Decimal64Field(scale, default=None, alias=None, materialized=None, readonly=None)
### DecimalField
Extends Field
Abstract base class for all integer-type fields.
Base class for all decimal fields. Can also be used directly.
#### BaseIntField(default=None, alias=None, materialized=None, readonly=None)
#### DecimalField(precision, scale, default=None, alias=None, materialized=None, readonly=None)
### BaseFloatField
### Enum16Field
Extends Field
Extends BaseEnumField
#### Enum16Field(enum_cls, default=None, alias=None, materialized=None, readonly=None)
Abstract base class for all float-type fields.
### Enum8Field
#### BaseFloatField(default=None, alias=None, materialized=None, readonly=None)
Extends BaseEnumField
#### Enum8Field(enum_cls, default=None, alias=None, materialized=None, readonly=None)
### BaseEnumField
Extends Field
### Field
Abstract base class for all enum-type fields.
Abstract base class for all field types.
#### BaseEnumField(enum_cls, default=None, alias=None, materialized=None, readonly=None)
### ArrayField
Extends Field
#### ArrayField(inner_field, default=None, alias=None, materialized=None, readonly=None)
### NullableField
Extends Field
#### NullableField(inner_field, default=None, alias=None, materialized=None, extra_null_values=None)
#### Field(default=None, alias=None, materialized=None, readonly=None)
### FixedStringField
@ -574,39 +615,18 @@ Extends StringField
#### FixedStringField(length, default=None, alias=None, materialized=None, readonly=None)
### UInt8Field
### Float32Field
Extends BaseIntField
Extends BaseFloatField
#### UInt8Field(default=None, alias=None, materialized=None, readonly=None)
#### Float32Field(default=None, alias=None, materialized=None, readonly=None)
### UInt16Field
### Float64Field
Extends BaseIntField
Extends BaseFloatField
#### UInt16Field(default=None, alias=None, materialized=None, readonly=None)
### UInt32Field
Extends BaseIntField
#### UInt32Field(default=None, alias=None, materialized=None, readonly=None)
### UInt64Field
Extends BaseIntField
#### UInt64Field(default=None, alias=None, materialized=None, readonly=None)
### Int8Field
Extends BaseIntField
#### Int8Field(default=None, alias=None, materialized=None, readonly=None)
#### Float64Field(default=None, alias=None, materialized=None, readonly=None)
### Int16Field
@ -630,32 +650,53 @@ Extends BaseIntField
#### Int64Field(default=None, alias=None, materialized=None, readonly=None)
### Float32Field
### Int8Field
Extends BaseFloatField
Extends BaseIntField
#### Float32Field(default=None, alias=None, materialized=None, readonly=None)
#### Int8Field(default=None, alias=None, materialized=None, readonly=None)
### Float64Field
### NullableField
Extends BaseFloatField
Extends Field
#### Float64Field(default=None, alias=None, materialized=None, readonly=None)
#### NullableField(inner_field, default=None, alias=None, materialized=None, extra_null_values=None)
### Enum8Field
### StringField
Extends BaseEnumField
Extends Field
#### Enum8Field(enum_cls, default=None, alias=None, materialized=None, readonly=None)
#### StringField(default=None, alias=None, materialized=None, readonly=None)
### Enum16Field
### UInt16Field
Extends BaseEnumField
Extends BaseIntField
#### Enum16Field(enum_cls, default=None, alias=None, materialized=None, readonly=None)
#### UInt16Field(default=None, alias=None, materialized=None, readonly=None)
### UInt32Field
Extends BaseIntField
#### UInt32Field(default=None, alias=None, materialized=None, readonly=None)
### UInt64Field
Extends BaseIntField
#### UInt64Field(default=None, alias=None, materialized=None, readonly=None)
### UInt8Field
Extends BaseIntField
#### UInt8Field(default=None, alias=None, materialized=None, readonly=None)
infi.clickhouse_orm.engines

4
docs/field_types.md
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@ -21,6 +21,10 @@ Currently the following field types are supported:
| UInt64Field | UInt64 | int/long | Range 0 to 18446744073709551615
| Float32Field | Float32 | float |
| Float64Field | Float64 | float |
| DecimalField | Decimal | Decimal | Pythonic values are rounded to fit the scale of the database field
| Decimal32Field | Decimal32 | Decimal | Ditto
| Decimal64Field | Decimal64 | Decimal | Ditto
| Decimal128Field | Decimal128 | Decimal | Ditto
| Enum8Field | Enum8 | Enum | See below
| Enum16Field | Enum16 | Enum | See below
| ArrayField | Array | list | See below

36
docs/toc.md
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@ -65,28 +65,32 @@
* [BufferModel](class_reference.md#buffermodel)
* [DistributedModel](class_reference.md#distributedmodel)
* [infi.clickhouse_orm.fields](class_reference.md#infi.clickhouse_orm.fields)
* [Field](class_reference.md#field)
* [StringField](class_reference.md#stringfield)
* [ArrayField](class_reference.md#arrayfield)
* [BaseEnumField](class_reference.md#baseenumfield)
* [BaseFloatField](class_reference.md#basefloatfield)
* [BaseIntField](class_reference.md#baseintfield)
* [DateField](class_reference.md#datefield)
* [DateTimeField](class_reference.md#datetimefield)
* [BaseIntField](class_reference.md#baseintfield)
* [BaseFloatField](class_reference.md#basefloatfield)
* [BaseEnumField](class_reference.md#baseenumfield)
* [ArrayField](class_reference.md#arrayfield)
* [NullableField](class_reference.md#nullablefield)
* [Decimal128Field](class_reference.md#decimal128field)
* [Decimal32Field](class_reference.md#decimal32field)
* [Decimal64Field](class_reference.md#decimal64field)
* [DecimalField](class_reference.md#decimalfield)
* [Enum16Field](class_reference.md#enum16field)
* [Enum8Field](class_reference.md#enum8field)
* [Field](class_reference.md#field)
* [FixedStringField](class_reference.md#fixedstringfield)
* [UInt8Field](class_reference.md#uint8field)
* [UInt16Field](class_reference.md#uint16field)
* [UInt32Field](class_reference.md#uint32field)
* [UInt64Field](class_reference.md#uint64field)
* [Int8Field](class_reference.md#int8field)
* [Float32Field](class_reference.md#float32field)
* [Float64Field](class_reference.md#float64field)
* [Int16Field](class_reference.md#int16field)
* [Int32Field](class_reference.md#int32field)
* [Int64Field](class_reference.md#int64field)
* [Float32Field](class_reference.md#float32field)
* [Float64Field](class_reference.md#float64field)
* [Enum8Field](class_reference.md#enum8field)
* [Enum16Field](class_reference.md#enum16field)
* [Int8Field](class_reference.md#int8field)
* [NullableField](class_reference.md#nullablefield)
* [StringField](class_reference.md#stringfield)
* [UInt16Field](class_reference.md#uint16field)
* [UInt32Field](class_reference.md#uint32field)
* [UInt64Field](class_reference.md#uint64field)
* [UInt8Field](class_reference.md#uint8field)
* [infi.clickhouse_orm.engines](class_reference.md#infi.clickhouse_orm.engines)
* [Engine](class_reference.md#engine)
* [TinyLog](class_reference.md#tinylog)

2
scripts/generate_ref.py
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@ -133,6 +133,6 @@ if __name__ == '__main__':
print
module_doc([database.Database, database.DatabaseException])
module_doc([models.Model, models.BufferModel, models.DistributedModel])
module_doc([fields.Field] + all_subclasses(fields.Field), False)
module_doc(sorted([fields.Field] + all_subclasses(fields.Field), key=lambda x: x.__name__), False)
module_doc([engines.Engine] + all_subclasses(engines.Engine), False)
module_doc([query.QuerySet, query.AggregateQuerySet])

16
src/infi/clickhouse_orm/database.py
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@ -90,6 +90,7 @@ class Database(object):
self.username = username
self.password = password
self.readonly = False
self.settings = {}
self.db_exists = False
self.db_exists = self._is_existing_database()
if readonly:
@ -143,6 +144,20 @@ class Database(object):
r = self._send(sql % (self.db_name, model_class.table_name()))
return r.text.strip() == '1'
def add_setting(self, name, value):
'''
Adds a database setting that will be sent with every request.
For example, `db.add_setting("max_execution_time", 10)` will
limit query execution time to 10 seconds.
The name must be string, and the value is converted to string in case
it isn't. To remove a setting, pass `None` as the value.
'''
assert isinstance(name, string_types), 'Setting name must be a string'
if value is None:
self.settings.pop(name, None)
else:
self.settings[name] = str(value)
def insert(self, model_instances, batch_size=1000):
'''
Insert records into the database.
@ -311,6 +326,7 @@ class Database(object):
def _build_params(self, settings):
params = dict(settings or {})
params.update(self.settings)
if self.db_exists:
params['database'] = self.db_name
if self.username:

62
src/infi/clickhouse_orm/fields.py
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@ -5,6 +5,7 @@ import iso8601
import pytz
import time
from calendar import timegm
from decimal import Decimal, localcontext
from .utils import escape, parse_array, comma_join
@ -293,6 +294,67 @@ class Float64Field(BaseFloatField):
db_type = 'Float64'
class DecimalField(Field):
'''
Base class for all decimal fields. Can also be used directly.
'''
def __init__(self, precision, scale, default=None, alias=None, materialized=None, readonly=None):
assert 1 <= precision <= 38, 'Precision must be between 1 and 38'
assert 0 <= scale <= precision, 'Scale must be between 0 and the given precision'
self.precision = precision
self.scale = scale
self.db_type = 'Decimal(%d,%d)' % (self.precision, self.scale)
with localcontext() as ctx:
ctx.prec = 38
self.exp = Decimal(10) ** -self.scale # for rounding to the required scale
self.max_value = Decimal(10 ** (self.precision - self.scale)) - self.exp
self.min_value = -self.max_value
super(DecimalField, self).__init__(default, alias, materialized, readonly)
def to_python(self, value, timezone_in_use):
if not isinstance(value, Decimal):
try:
value = Decimal(value)
except:
raise ValueError('Invalid value for %s - %r' % (self.__class__.__name__, value))
if not value.is_finite():
raise ValueError('Non-finite value for %s - %r' % (self.__class__.__name__, value))
return self._round(value)
def to_db_string(self, value, quote=True):
# There's no need to call escape since numbers do not contain
# special characters, and never need quoting
return text_type(value)
def _round(self, value):
return value.quantize(self.exp)
def validate(self, value):
self._range_check(value, self.min_value, self.max_value)
class Decimal32Field(DecimalField):
def __init__(self, scale, default=None, alias=None, materialized=None, readonly=None):
super(Decimal32Field, self).__init__(9, scale, default, alias, materialized, readonly)
self.db_type = 'Decimal32(%d)' % scale
class Decimal64Field(DecimalField):
def __init__(self, scale, default=None, alias=None, materialized=None, readonly=None):
super(Decimal64Field, self).__init__(18, scale, default, alias, materialized, readonly)
self.db_type = 'Decimal64(%d)' % scale
class Decimal128Field(DecimalField):
def __init__(self, scale, default=None, alias=None, materialized=None, readonly=None):
super(Decimal128Field, self).__init__(38, scale, default, alias, materialized, readonly)
self.db_type = 'Decimal128(%d)' % scale
class BaseEnumField(Field):
'''
Abstract base class for all enum-type fields.

4
src/infi/clickhouse_orm/models.py
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@ -80,6 +80,10 @@ class ModelBase(type):
if db_type.startswith('FixedString'):
length = int(db_type[12 : -1])
return orm_fields.FixedStringField(length)
# Decimal
if db_type.startswith('Decimal'):
precision, scale = [int(n.strip()) for n in db_type[8 : -1].split(',')]
return orm_fields.DecimalField(precision, scale)
# Nullable
if db_type.startswith('Nullable'):
inner_field = cls.create_ad_hoc_field(db_type[9 : -1])

12
tests/test_database.py
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@ -184,3 +184,15 @@ class DatabaseTestCase(TestCaseWithData):
pass
self.assertTrue(self.database.does_table_exist(Person))
self.assertFalse(self.database.does_table_exist(Person2))
def test_add_setting(self):
# Non-string setting name should not be accepted
with self.assertRaises(AssertionError):
self.database.add_setting(0, 1)
# Add a setting and see that it makes the query fail
self.database.add_setting('max_columns_to_read', 1)
with self.assertRaises(ServerError):
list(self.database.select('SELECT * from system.tables'))
# Remove the setting and see that now it works
self.database.add_setting('max_columns_to_read', None)
list(self.database.select('SELECT * from system.tables'))

119
tests/test_decimal_fields.py Normal file
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@ -0,0 +1,119 @@
# -*- coding: utf-8 -*-
from __future__ import unicode_literals
import unittest
from decimal import Decimal
from infi.clickhouse_orm.database import Database
from infi.clickhouse_orm.models import Model
from infi.clickhouse_orm.fields import *
from infi.clickhouse_orm.engines import *
class DecimalFieldsTest(unittest.TestCase):
def setUp(self):
self.database = Database('test-db')
self.database.add_setting('allow_experimental_decimal_type', 1)
self.database.create_table(DecimalModel)
def tearDown(self):
self.database.drop_database()
def _insert_sample_data(self):
self.database.insert([
DecimalModel(date_field='2016-08-20'),
DecimalModel(date_field='2016-08-21', dec=Decimal('1.234')),
DecimalModel(date_field='2016-08-22', dec32=Decimal('12342.2345')),
DecimalModel(date_field='2016-08-23', dec64=Decimal('12342.23456')),
DecimalModel(date_field='2016-08-24', dec128=Decimal('-4545456612342.234567')),
])
def _assert_sample_data(self, results):
self.assertEqual(len(results), 5)
self.assertEqual(results[0].dec, Decimal(0))
self.assertEqual(results[0].dec32, Decimal(17))
self.assertEqual(results[1].dec, Decimal('1.234'))
self.assertEqual(results[2].dec32, Decimal('12342.2345'))
self.assertEqual(results[3].dec64, Decimal('12342.23456'))
self.assertEqual(results[4].dec128, Decimal('-4545456612342.234567'))
def test_insert_and_select(self):
self._insert_sample_data()
query = 'SELECT * from $table ORDER BY date_field'
results = list(self.database.select(query, DecimalModel))
self._assert_sample_data(results)
def test_ad_hoc_model(self):
self._insert_sample_data()
query = 'SELECT * from decimalmodel ORDER BY date_field'
results = list(self.database.select(query))
self._assert_sample_data(results)
def test_rounding(self):
d = Decimal('11111.2340000000000000001')
self.database.insert([DecimalModel(date_field='2016-08-20', dec=d, dec32=d, dec64=d, dec128=d)])
m = DecimalModel.objects_in(self.database)[0]
for val in (m.dec, m.dec32, m.dec64, m.dec128):
self.assertEqual(val, Decimal('11111.234'))
def test_assignment_ok(self):
for value in (True, False, 17, 3.14, '20.5', Decimal('20.5')):
DecimalModel(dec=value)
def test_assignment_error(self):
for value in ('abc', u'זה ארוך', None, float('NaN'), Decimal('-Infinity')):
with self.assertRaises(ValueError):
DecimalModel(dec=value)
def test_aggregation(self):
self._insert_sample_data()
result = DecimalModel.objects_in(self.database).aggregate(m='min(dec)', n='max(dec)')
self.assertEqual(result[0].m, Decimal(0))
self.assertEqual(result[0].n, Decimal('1.234'))
def test_precision_and_scale(self):
# Go over all valid combinations
for precision in range(1, 39):
for scale in range(0, precision + 1):
f = DecimalField(precision, scale)
# Some invalid combinations
for precision, scale in [(0, 0), (-1, 7), (7, -1), (39, 5), (20, 21)]:
with self.assertRaises(AssertionError):
f = DecimalField(precision, scale)
def test_min_max(self):
# In range
f = DecimalField(3, 1)
f.validate(f.to_python('99.9', None))
f.validate(f.to_python('-99.9', None))
# In range after rounding
f.validate(f.to_python('99.94', None))
f.validate(f.to_python('-99.94', None))
# Out of range
with self.assertRaises(ValueError):
f.validate(f.to_python('99.99', None))
with self.assertRaises(ValueError):
f.validate(f.to_python('-99.99', None))
# In range
f = Decimal32Field(4)
f.validate(f.to_python('99999.9999', None))
f.validate(f.to_python('-99999.9999', None))
# In range after rounding
f.validate(f.to_python('99999.99994', None))
f.validate(f.to_python('-99999.99994', None))
# Out of range
with self.assertRaises(ValueError):
f.validate(f.to_python('100000', None))
with self.assertRaises(ValueError):
f.validate(f.to_python('-100000', None))
class DecimalModel(Model):
date_field = DateField()
dec = DecimalField(15, 3)
dec32 = Decimal32Field(4, default=17)
dec64 = Decimal64Field(5)
dec128 = Decimal128Field(6)
engine = Memory()