asterix-graphix/src/test/resources/runtimets/queries/graphix/graphix-functions/graphix-functions.4.query.sqlpp

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
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// Test each simple edge function (direction, label, and detail).
FROM GRAPH  VERTEX (:User)
                   PRIMARY KEY (user_id)
                   AS Yelp.Users,
            VERTEX (:Review)
                   PRIMARY KEY (review_id)
                   AS Yelp.Reviews,
            EDGE   (:User)-[:FRIENDS_WITH]->(:User)
                   SOURCE KEY (user_id)
                   DESTINATION KEY (friend)
                   AS ( FROM    Yelp.Friends F
                        SELECT  F.user_id AS user_id,
                                F.friend AS friend ),
            EDGE   (:User)<-[:MADE_BY]-(:Review)
                   SOURCE KEY (review_id)
                   DESTINATION KEY (user_id)
                   AS ( FROM    Yelp.Reviews R
                        SELECT  R.review_id,
                                R.user_id )
MATCH       (n1)-[e]-(n2)
LET         sourceVertex = SOURCE_VERTEX(e),
            destVertex = DEST_VERTEX(e)
SELECT      DIRECTION(e) AS direction,
            LABEL(e) AS edgeLabel,
            LABEL(n1) AS n1Label,
            LABEL(n2) AS n2Label,
            LABEL(sourceVertex) AS sourceElementLabel,
            LABEL(destVertex) AS destElementLabel,
            EDGE_DETAIL(e) AS edgeDetail
ORDER BY    direction, edgeLabel, n1Label, n2Label, edgeDetail;