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db: fix broken command "list ... group"

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Grouping in the "list" command was completely broken from the start,
unlike "count group".  I have no idea what I have been thinking when I
wrote commit ae178c77bd, but it didn't
make any sense.

This commit is a rewrite of the feature.

For clients to be able to detect this feature, this commit also
increments the protocol version.
This commit is contained in:
Max Kellermann
2018-10-22 11:35:22 +02:00
parent 7cfe929c36
commit db27bb76e2
15 changed files with 145 additions and 332 deletions
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9
src/db/plugins/simple/SimpleDatabasePlugin.cxx
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@@ -312,12 +312,11 @@ SimpleDatabase::Visit(const DatabaseSelection &selection,
"No such directory");
}
void
SimpleDatabase::VisitUniqueTags(const DatabaseSelection &selection,
TagType tag_type, tag_mask_t group_mask,
VisitTag visit_tag) const
std::map<std::string, std::set<std::string>>
SimpleDatabase::CollectUniqueTags(const DatabaseSelection &selection,
TagType tag_type, TagType group) const
{
::VisitUniqueTags(*this, selection, tag_type, group_mask, visit_tag);
return ::CollectUniqueTags(*this, selection, tag_type, group);
}
DatabaseStats