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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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6
src/db/plugins/simple/SimpleDatabasePlugin.hxx
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@@ -119,9 +119,9 @@ public:
VisitSong visit_song,
VisitPlaylist visit_playlist) const override;
void VisitUniqueTags(const DatabaseSelection &selection,
TagType tag_type, tag_mask_t group_mask,
VisitTag visit_tag) const override;
std::map<std::string, std::set<std::string>> CollectUniqueTags(const DatabaseSelection &selection,
TagType tag_type,
TagType group) const override;
DatabaseStats GetStats(const DatabaseSelection &selection) const override;