From 86351f5eda559b9d14f17672c33f07043a96a0a7 Mon Sep 17 00:00:00 2001 From: Sergei Petrunia Date: Sat, 28 Oct 2023 12:47:55 +0300 Subject: [PATCH] MDEV-32351: Significant slowdown with outer joins: fix embedded. For some reason, in embedded server, a command let $a=`$query` ignores local context. Make a workaround: use SET STATEMENT to set debug_dbug in the same statement. --- mysql-test/main/join_cache_debug.result | 3 +-- mysql-test/main/join_cache_debug.test | 7 +++---- 2 files changed, 4 insertions(+), 6 deletions(-) diff --git a/mysql-test/main/join_cache_debug.result b/mysql-test/main/join_cache_debug.result index f6c450ed3a5..c0769d5117d 100644 --- a/mysql-test/main/join_cache_debug.result +++ b/mysql-test/main/join_cache_debug.result @@ -24,8 +24,7 @@ select t1.b as t1_b, t2.b as t2_b, t2.d as t2_d FROM t1 LEFT JOIN t2 ON t1.b = t2.b; -SET @old_debug=@@debug_dbug; -SET debug_dbug='+d,analyze_print_r_unpack_ops'; +SET statement debug_dbug='+d,analyze_print_r_unpack_ops' for analyze format=json SELECT COUNT(*) diff --git a/mysql-test/main/join_cache_debug.test b/mysql-test/main/join_cache_debug.test index 6179daaf947..aba36b14f29 100644 --- a/mysql-test/main/join_cache_debug.test +++ b/mysql-test/main/join_cache_debug.test @@ -20,10 +20,9 @@ select FROM t1 LEFT JOIN t2 ON t1.b = t2.b; -SET @old_debug=@@debug_dbug; -SET debug_dbug='+d,analyze_print_r_unpack_ops'; - -let $q= analyze +let $q= +SET statement debug_dbug='+d,analyze_print_r_unpack_ops' for +analyze format=json SELECT COUNT(*) FROM t1_t2