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-rw-r--r--mysql-test/main/range_debug.test30
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diff --git a/mysql-test/main/range_debug.test b/mysql-test/main/range_debug.test
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+source include/have_debug.inc;
+#
+# BUG#21282
+#
+create table t1 (a int);
+insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
+create table t2 (a int, key(a));
+insert into t2 select 2*(A.a + 10*(B.a + 10*C.a)) from t1 A, t1 B, t1 C;
+
+set in_predicate_conversion_threshold= 2000;
+
+set @a="select * from t2 force index (a) where a NOT IN(0";
+select count(*) from (select @a:=concat(@a, ',', a) from t2 ) Z;
+set @a=concat(@a, ')');
+
+insert into t2 values (11),(13),(15);
+
+set @b= concat("explain ", @a);
+
+prepare stmt1 from @b;
+execute stmt1;
+
+prepare stmt1 from @a;
+execute stmt1;
+
+set in_predicate_conversion_threshold= default;
+
+drop table t1, t2;
+
+