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phases: avoid N² behavior in `advanceboundary`...

phases: avoid N² behavior in `advanceboundary` We allowed duplicated entries in the deque, which each entry could potentially insert all its ancestors. So advancing boundary for the full repository would mean each revision would walk all its ancestors, resulting in O(N²) iteration. For repository of any decent size, N² is quickly insane. We introduce a simple set to avoid this and get back to reasonable performance.

Gregory Szorc - - Load All Authors

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      # Copyright 2016-present Facebook. All Rights Reserved.

      #

      # error: errors used in fastannotate

      #

      # This software may be used and distributed according to the terms of the

      # GNU General Public License version 2 or any later version.

      class CorruptedFileError(Exception):

          pass

      class CannotReuseError(Exception):

          """cannot reuse or update the cache incrementally"""

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				# Copyright 2016-present Facebook. All Rights Reserved.
				#
				# error: errors used in fastannotate
				#
				# This software may be used and distributed according to the terms of the
				# GNU General Public License version 2 or any later version.


				class CorruptedFileError(Exception):
				pass


				class CannotReuseError(Exception):
				"""cannot reuse or update the cache incrementally"""