Merge "Use Query.column_descriptions instead of private property"
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@ -50,7 +50,7 @@ class TimeStamp_db_mixin(object):
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raise n_exc.InvalidInput(error_message=msg)
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changed_since = (timeutils.
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normalize_time(changed_since_string))
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target_model_class = list(query._mapper_adapter_map.keys())[0]
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target_model_class = query.column_descriptions[0]['type']
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query = query.join(standard_attr.StandardAttribute,
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target_model_class.standard_attr_id ==
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standard_attr.StandardAttribute.id).filter(
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