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maps: do not ask sqlite for row count
"SELECT COUNT(1) FROM x" is not O(1) for sqlite and can be slow on large
tables. This patch changes the count to be backed by a file instead.
The change exposes a risk that the number may become inaccurate, if
__setitem__ is called with a same key multiple times. But we don't do that
during pull, and only use __len__ to calculate how many revisions pulled,
or test if the map is empty. So it would be fine.
| author | Jun Wu <quark@fb.com> |
|---|---|
| date | Thu, 23 Jun 2016 10:46:07 +0100 |
| parents | ea65fe2b0856 |
| children |
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SVN-fs-dump-format-version: 2 UUID: 20b2173d-0f26-4070-9891-00196be06b32 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2008-11-25T23:08:28.726784Z PROPS-END Revision-number: 1 Prop-content-length: 114 Content-length: 114 K 7 svn:log V 12 init project K 10 svn:author V 7 pmezard K 8 svn:date V 27 2008-11-25T23:08:28.798249Z PROPS-END Node-path: branches Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Revision-number: 2 Prop-content-length: 116 Content-length: 116 K 7 svn:log V 14 add a in trunk K 10 svn:author V 7 pmezard K 8 svn:date V 27 2008-11-25T23:08:29.163194Z PROPS-END Node-path: trunk/a Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 60b725f10c9c85c70d97880dfe8191b3 Content-length: 12 PROPS-END a Revision-number: 3 Prop-content-length: 118 Content-length: 118 K 7 svn:log V 16 add b in branch1 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2008-11-25T23:08:30.176855Z PROPS-END Node-path: branches/branch1 Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: branches/branch1/b Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 3b5d5c3712955042212316173ccf37be Content-length: 12 PROPS-END b Revision-number: 4 Prop-content-length: 118 Content-length: 118 K 7 svn:log V 16 add b to branch2 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2008-11-25T23:08:32.174817Z PROPS-END Node-path: branches/branch2 Node-kind: dir Node-action: add Node-copyfrom-rev: 1 Node-copyfrom-path: trunk Prop-content-length: 34 Content-length: 34 K 13 svn:mergeinfo V 0 PROPS-END Node-path: branches/branch2/a Node-kind: file Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk/a Text-copy-source-md5: 60b725f10c9c85c70d97880dfe8191b3 Node-path: branches/branch2/b Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 3b5d5c3712955042212316173ccf37be Content-length: 12 PROPS-END b Revision-number: 5 Prop-content-length: 120 Content-length: 120 K 7 svn:log V 18 add c in branches/ K 10 svn:author V 7 pmezard K 8 svn:date V 27 2008-11-25T23:08:33.166454Z PROPS-END Node-path: branches/c Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 2cd6ee2c70b0bde53fbe6cac3c8b8bb1 Content-length: 12 PROPS-END c Revision-number: 6 Prop-content-length: 109 Content-length: 109 K 7 svn:log V 8 change c K 10 svn:author V 7 pmezard K 8 svn:date V 27 2008-11-25T23:08:34.144541Z PROPS-END Node-path: branches/c Node-kind: file Node-action: change Text-content-length: 4 Text-content-md5: 63fad9092ad37713ebe26b3193f89c41 Content-length: 4 c c