Merge Sergey's fix for pbxt.join_nested.

1 files changed, 10 insertions, 2 deletions

diff --git a/mysql-test/suite/pbxt/t/join_nested.test b/mysql-test/suite/pbxt/t/join_nested.test
index e90aa843042..3b72dc1e293 100644
--- a/mysql-test/suite/pbxt/t/join_nested.test
+++ b/mysql-test/suite/pbxt/t/join_nested.test
@@ -546,8 +546,9 @@ SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
 
 CREATE INDEX idx_b ON t8(b);
 
+--replace_regex /Using where; // /Using where//
 --sorted_result
-EXPLAIN EXTENDED
+EXPLAIN
 SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
        t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
   FROM t0,t1
@@ -582,12 +583,16 @@ SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
            (t8.a < 1 OR t8.c IS NULL) AND
            (t8.b=t9.b OR t8.c IS NULL) AND
            (t9.a=1); 
+--echo ATTENTION: the above EXPLAIN has several competing QEPs with identical
+--echo .          costs. To combat the plan change it uses --sorted_result and
+--echo .          and --replace tricks
 
 CREATE INDEX idx_b ON t1(b);
 CREATE INDEX idx_a ON t0(a);
 
+--replace_regex /Using where; // /Using where//
 --sorted_result
-EXPLAIN EXTENDED
+EXPLAIN 
 SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
        t5.a,t5.b,t6.a,t6.b,t7.a,t7.b,t8.a,t8.b,t9.a,t9.b
   FROM t0,t1
@@ -622,6 +627,9 @@ SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,
            (t8.a < 1 OR t8.c IS NULL) AND
            (t8.b=t9.b OR t8.c IS NULL) AND
            (t9.a=1); 
+--echo ATTENTION: the above EXPLAIN has several competing QEPs with identical
+--echo .          costs. To combat the plan change it uses --sorted_result
+--echo .          and --replace tricks
 
 --sorted_result
 SELECT t0.a,t0.b,t1.a,t1.b,t2.a,t2.b,t3.a,t3.b,t4.a,t4.b,