Fix combined alters on PostgreSQL
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@ -1,10 +1,12 @@
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import sys
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import hashlib
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import operator
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from django.db.backends.creation import BaseDatabaseCreation
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from django.db.backends.util import truncate_name
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from django.utils.log import getLogger
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from django.db.models.fields.related import ManyToManyField
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from django.db.transaction import atomic
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from django.utils.six.moves import reduce
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logger = getLogger('django.db.backends.schema')
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@ -525,7 +527,7 @@ class BaseDatabaseSchemaEditor(object):
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# Combine actions together if we can (e.g. postgres)
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if self.connection.features.supports_combined_alters:
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sql, params = tuple(zip(*actions))
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actions = [(", ".join(sql), params)]
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actions = [(", ".join(sql), reduce(operator.add, params))]
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# Apply those actions
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for sql, params in actions:
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self.execute(
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