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-rw-r--r--mysql-test/t/gis.test15
1 files changed, 15 insertions, 0 deletions
diff --git a/mysql-test/t/gis.test b/mysql-test/t/gis.test
index b109b8f6b0c..b7a45418706 100644
--- a/mysql-test/t/gis.test
+++ b/mysql-test/t/gis.test
@@ -1465,6 +1465,21 @@ DROP VIEW v1;
SELECT AsText(g) FROM (SELECT NULL AS g UNION SELECT Point(1,1)) AS t1;
--echo #
+--echo # MDEV-10306 Wrong results with combination of CONCAT, SUBSTR and CONVERT in subquery
+--echo #
+
+SET @save_optimizer_switch=@@optimizer_switch;
+SET optimizer_switch='derived_merge=on';
+CREATE TABLE t1 (x INT, y INT);
+INSERT INTO t1 VALUES(0,0);
+SELECT LENGTH(t2) c2 FROM (SELECT ST_BUFFER(POINT(x,y), 0) t2 FROM t1) sub;
+SELECT LENGTH(CONCAT(t2,'-',t2)) c2 FROM (SELECT ST_BUFFER(POINT(x,y), 0) t2 FROM t1) sub;
+SELECT LENGTH(CONCAT(t2,'--',t2)) c2 FROM (SELECT ST_BUFFER(POINT(x,y), 0) t2 FROM t1) sub;
+DROP TABLE t1;
+SET optimizer_switch=@save_optimizer_switch;
+
+
+--echo #
--echo # End 10.0 tests
--echo #