[tracker/wip/carlosg/more-tests: 2/12] libtracker-data: Fix tracker:title-sort

[Carlos Garnacho <carlosg src gnome org>]

commit b4418cc1510e552099c89d9eb4bdd42ef76de8b7
Author: Carlos Garnacho <carlosg gnome org>
Date:   Thu Sep 10 19:26:21 2020 +0200

    libtracker-data: Fix tracker:title-sort
    
    With a hack really, up in the parse tree we do force "COLLATE TRACKER"
    on all string arguments passed on ORDER BY. Make this return "unknown"
    just so this is avoided.
    
    tracker:title-sort() is not meant to produce a pretty visible string,
    more a collation key, perhaps it is somewhat fitting, perhaps I'm
    making up an excuse.

 src/libtracker-data/tracker-sparql.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/libtracker-data/tracker-sparql.c b/src/libtracker-data/tracker-sparql.c
index ab2d7d735..5e26b2f28 100644
--- a/src/libtracker-data/tracker-sparql.c
+++ b/src/libtracker-data/tracker-sparql.c
@@ -7741,6 +7741,7 @@ handle_custom_function (TrackerSparql  *sparql,
        } else if (g_str_equal (function, TRACKER_NS "title-order")) {
                _call_rule (sparql, NAMED_RULE_ArgList, error);
                _append_string (sparql, "COLLATE " TRACKER_TITLE_COLLATION_NAME " ");
+               sparql->current_state->expression_type = TRACKER_PROPERTY_TYPE_UNKNOWN;
        } else if (g_str_equal (function, TRACKER_NS "ascii-lower-case")) {
                sparql->current_state->convert_to_string = TRUE;
                _append_string (sparql, "lower (");