This changes order of graph pattern elements, moving OPTIONAL block to
the end of the query. This gives a dramatic performance improvement.
---
plugins/phonebook-tracker.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/plugins/phonebook-tracker.c b/plugins/phonebook-tracker.c
index 1022d3a..80dfc02 100644
--- a/plugins/phonebook-tracker.c
+++ b/plugins/phonebook-tracker.c
@@ -161,6 +161,7 @@
"?_call a nmo:Call . " \
"?_unb_contact a nco:Contact . " \
"?_unb_contact nco:hasPhoneNumber ?_cpn . " \
+CONSTRAINT \
"OPTIONAL { " \
"{ SELECT ?_contact ?_cpn ?_role ?_number " \
"count(?_contact) as ?cnt " \
@@ -177,7 +178,6 @@
"} GROUP BY ?_cpn } " \
"FILTER(?cnt = 1) " \
"} " \
-CONSTRAINT \
"} "
#define CALLS_LIST(CONSTRAINT) \
--
1.7.4.1
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