log: cache diffopts instance
It appears that calling patch.diff*opts() repeatedly has some cost.
$ hg log -T '{rev}\n' -R mercurial --time > /dev/null
(orig) time: real 4.430 secs (user 4.370+0.000 sys 0.050+0.000)
(new) time: real 1.950 secs (user 1.880+0.000 sys 0.060+0.000)
'diffopts or {}' isn't necessary as patch.diff*opts() accepts opts=None.
CREATE TABLE `bookmarkstonode` (
`node` varbinary(64) NOT NULL,
`bookmark` varbinary(512) NOT NULL,
`reponame` varbinary(255) NOT NULL,
PRIMARY KEY (`reponame`,`bookmark`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `bundles` (
`bundle` varbinary(512) NOT NULL,
`reponame` varbinary(255) NOT NULL,
PRIMARY KEY (`bundle`,`reponame`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `nodestobundle` (
`node` varbinary(64) NOT NULL,
`bundle` varbinary(512) NOT NULL,
`reponame` varbinary(255) NOT NULL,
PRIMARY KEY (`node`,`reponame`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `nodesmetadata` (
`node` varbinary(64) NOT NULL,
`message` mediumblob NOT NULL,
`p1` varbinary(64) NOT NULL,
`p2` varbinary(64) DEFAULT NULL,
`author` varbinary(255) NOT NULL,
`committer` varbinary(255) DEFAULT NULL,
`author_date` bigint(20) NOT NULL,
`committer_date` bigint(20) DEFAULT NULL,
`reponame` varbinary(255) NOT NULL,
`optional_json_metadata` mediumblob,
PRIMARY KEY (`reponame`,`node`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;