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-rw-r--r--mysql-test/r/explain_json.result12
-rw-r--r--mysql-test/t/explain_json.test8
2 files changed, 20 insertions, 0 deletions
diff --git a/mysql-test/r/explain_json.result b/mysql-test/r/explain_json.result
index 61d61323cb6..e1a09b82eff 100644
--- a/mysql-test/r/explain_json.result
+++ b/mysql-test/r/explain_json.result
@@ -894,3 +894,15 @@ EXPLAIN
}
}
DROP TABLE t1, t2;
+#
+# MDEV-7927: Server crashes in in Time_and_counter_tracker::incr_loops
+#
+CREATE TABLE t1 (i INT);
+INSERT INTO t1 VALUES (1),(2);
+EXPLAIN SELECT * FROM t1 WHERE 3 IN ( SELECT 4 UNION SELECT 5 );
+id select_type table type possible_keys key key_len ref rows Extra
+1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Impossible WHERE
+2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
+3 UNION NULL NULL NULL NULL NULL NULL NULL No tables used
+NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL
+DROP TABLE t1;
diff --git a/mysql-test/t/explain_json.test b/mysql-test/t/explain_json.test
index 7fc1f568cec..4ca16c8c03c 100644
--- a/mysql-test/t/explain_json.test
+++ b/mysql-test/t/explain_json.test
@@ -200,3 +200,11 @@ INSERT INTO t2 VALUES (3),(4);
EXPLAIN FORMAT=JSON SELECT * FROM t1 WHERE a <> ALL ( SELECT b FROM t2 );
DROP TABLE t1, t2;
+--echo #
+--echo # MDEV-7927: Server crashes in in Time_and_counter_tracker::incr_loops
+--echo #
+CREATE TABLE t1 (i INT);
+INSERT INTO t1 VALUES (1),(2);
+EXPLAIN SELECT * FROM t1 WHERE 3 IN ( SELECT 4 UNION SELECT 5 );
+DROP TABLE t1;
+