[tracker/wip/carlosg/sparql-parser-ng: 20/56] libtracker-data: Implement MINUS

[Carlos Garnacho <carlosg src gnome org>]

commit 58b399e302423ed9a65cb6b184f7a7b652bc0531
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Apr 6 00:48:27 2018 +0200

    libtracker-data: Implement MINUS
    
    Use the equivalent EXCEPT sqlite syntax.

 src/libtracker-data/tracker-sparql.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/src/libtracker-data/tracker-sparql.c b/src/libtracker-data/tracker-sparql.c
index ad0c756bc..1015a0a92 100644
--- a/src/libtracker-data/tracker-sparql.c
+++ b/src/libtracker-data/tracker-sparql.c
@@ -3073,7 +3073,12 @@ translate_MinusGraphPattern (TrackerSparql  *sparql,
 {
        /* MinusGraphPattern ::= 'MINUS' GroupGraphPattern
         */
-       _unimplemented ("MINUS");
+       _expect (sparql, RULE_TYPE_LITERAL, LITERAL_MINUS);
+       _prepend_string (sparql, "SELECT * FROM (");
+       _append_string (sparql, ") EXCEPT ");
+       _call_rule (sparql, NAMED_RULE_GroupGraphPattern, error);
+
+       return TRUE;
 }
 
 static void