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由 Karen Huddleston 提交于
Previously, if pg_statistic already contains statistics for a given table column, attempting to insert those statistics again during the restore would give a primary key error and statistics would not be correctly restored. Now, existing statistics are deleted just before inserting the restore statistics, so there is no collision. Signed-off-by: NJamie McAtamney <jmcatamney@pivotal.io>
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