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venv/Lib/site-packages/django/contrib/postgres/indexes.py
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228
venv/Lib/site-packages/django/contrib/postgres/indexes.py
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from django.db import NotSupportedError
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from django.db.models import Func, Index
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from django.utils.functional import cached_property
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__all__ = [
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'BloomIndex', 'BrinIndex', 'BTreeIndex', 'GinIndex', 'GistIndex',
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'HashIndex', 'SpGistIndex',
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]
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class PostgresIndex(Index):
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@cached_property
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def max_name_length(self):
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# Allow an index name longer than 30 characters when the suffix is
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# longer than the usual 3 character limit. The 30 character limit for
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# cross-database compatibility isn't applicable to PostgreSQL-specific
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# indexes.
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return Index.max_name_length - len(Index.suffix) + len(self.suffix)
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def create_sql(self, model, schema_editor, using='', **kwargs):
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self.check_supported(schema_editor)
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statement = super().create_sql(model, schema_editor, using=' USING %s' % self.suffix, **kwargs)
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with_params = self.get_with_params()
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if with_params:
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statement.parts['extra'] = 'WITH (%s) %s' % (
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', '.join(with_params),
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statement.parts['extra'],
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)
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return statement
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def check_supported(self, schema_editor):
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pass
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def get_with_params(self):
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return []
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class BloomIndex(PostgresIndex):
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suffix = 'bloom'
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def __init__(self, *expressions, length=None, columns=(), **kwargs):
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super().__init__(*expressions, **kwargs)
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if len(self.fields) > 32:
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raise ValueError('Bloom indexes support a maximum of 32 fields.')
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if not isinstance(columns, (list, tuple)):
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raise ValueError('BloomIndex.columns must be a list or tuple.')
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if len(columns) > len(self.fields):
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raise ValueError(
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'BloomIndex.columns cannot have more values than fields.'
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)
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if not all(0 < col <= 4095 for col in columns):
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raise ValueError(
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'BloomIndex.columns must contain integers from 1 to 4095.',
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)
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if length is not None and not 0 < length <= 4096:
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raise ValueError(
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'BloomIndex.length must be None or an integer from 1 to 4096.',
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)
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self.length = length
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self.columns = columns
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def deconstruct(self):
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path, args, kwargs = super().deconstruct()
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if self.length is not None:
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kwargs['length'] = self.length
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if self.columns:
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kwargs['columns'] = self.columns
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return path, args, kwargs
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def get_with_params(self):
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with_params = []
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if self.length is not None:
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with_params.append('length = %d' % self.length)
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if self.columns:
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with_params.extend(
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'col%d = %d' % (i, v)
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for i, v in enumerate(self.columns, start=1)
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)
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return with_params
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class BrinIndex(PostgresIndex):
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suffix = 'brin'
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def __init__(self, *expressions, autosummarize=None, pages_per_range=None, **kwargs):
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if pages_per_range is not None and pages_per_range <= 0:
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raise ValueError('pages_per_range must be None or a positive integer')
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self.autosummarize = autosummarize
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self.pages_per_range = pages_per_range
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super().__init__(*expressions, **kwargs)
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def deconstruct(self):
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path, args, kwargs = super().deconstruct()
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if self.autosummarize is not None:
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kwargs['autosummarize'] = self.autosummarize
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if self.pages_per_range is not None:
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kwargs['pages_per_range'] = self.pages_per_range
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return path, args, kwargs
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def get_with_params(self):
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with_params = []
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if self.autosummarize is not None:
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with_params.append('autosummarize = %s' % ('on' if self.autosummarize else 'off'))
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if self.pages_per_range is not None:
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with_params.append('pages_per_range = %d' % self.pages_per_range)
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return with_params
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class BTreeIndex(PostgresIndex):
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suffix = 'btree'
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def __init__(self, *expressions, fillfactor=None, **kwargs):
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self.fillfactor = fillfactor
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super().__init__(*expressions, **kwargs)
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def deconstruct(self):
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path, args, kwargs = super().deconstruct()
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if self.fillfactor is not None:
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kwargs['fillfactor'] = self.fillfactor
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return path, args, kwargs
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def get_with_params(self):
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with_params = []
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if self.fillfactor is not None:
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with_params.append('fillfactor = %d' % self.fillfactor)
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return with_params
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class GinIndex(PostgresIndex):
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suffix = 'gin'
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def __init__(self, *expressions, fastupdate=None, gin_pending_list_limit=None, **kwargs):
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self.fastupdate = fastupdate
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self.gin_pending_list_limit = gin_pending_list_limit
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super().__init__(*expressions, **kwargs)
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def deconstruct(self):
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path, args, kwargs = super().deconstruct()
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if self.fastupdate is not None:
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kwargs['fastupdate'] = self.fastupdate
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if self.gin_pending_list_limit is not None:
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kwargs['gin_pending_list_limit'] = self.gin_pending_list_limit
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return path, args, kwargs
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def get_with_params(self):
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with_params = []
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if self.gin_pending_list_limit is not None:
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with_params.append('gin_pending_list_limit = %d' % self.gin_pending_list_limit)
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if self.fastupdate is not None:
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with_params.append('fastupdate = %s' % ('on' if self.fastupdate else 'off'))
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return with_params
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class GistIndex(PostgresIndex):
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suffix = 'gist'
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def __init__(self, *expressions, buffering=None, fillfactor=None, **kwargs):
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self.buffering = buffering
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self.fillfactor = fillfactor
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super().__init__(*expressions, **kwargs)
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def deconstruct(self):
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path, args, kwargs = super().deconstruct()
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if self.buffering is not None:
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kwargs['buffering'] = self.buffering
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if self.fillfactor is not None:
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kwargs['fillfactor'] = self.fillfactor
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return path, args, kwargs
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def get_with_params(self):
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with_params = []
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if self.buffering is not None:
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with_params.append('buffering = %s' % ('on' if self.buffering else 'off'))
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if self.fillfactor is not None:
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with_params.append('fillfactor = %d' % self.fillfactor)
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return with_params
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def check_supported(self, schema_editor):
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if self.include and not schema_editor.connection.features.supports_covering_gist_indexes:
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raise NotSupportedError('Covering GiST indexes requires PostgreSQL 12+.')
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class HashIndex(PostgresIndex):
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suffix = 'hash'
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def __init__(self, *expressions, fillfactor=None, **kwargs):
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self.fillfactor = fillfactor
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super().__init__(*expressions, **kwargs)
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def deconstruct(self):
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path, args, kwargs = super().deconstruct()
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if self.fillfactor is not None:
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kwargs['fillfactor'] = self.fillfactor
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return path, args, kwargs
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def get_with_params(self):
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with_params = []
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if self.fillfactor is not None:
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with_params.append('fillfactor = %d' % self.fillfactor)
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return with_params
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class SpGistIndex(PostgresIndex):
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suffix = 'spgist'
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def __init__(self, *expressions, fillfactor=None, **kwargs):
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self.fillfactor = fillfactor
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super().__init__(*expressions, **kwargs)
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def deconstruct(self):
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path, args, kwargs = super().deconstruct()
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if self.fillfactor is not None:
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kwargs['fillfactor'] = self.fillfactor
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return path, args, kwargs
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def get_with_params(self):
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with_params = []
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if self.fillfactor is not None:
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with_params.append('fillfactor = %d' % self.fillfactor)
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return with_params
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class OpClass(Func):
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template = '%(expressions)s %(name)s'
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def __init__(self, expression, name):
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super().__init__(expression, name=name)
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