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MDEV-32351: Significant slowdown with outer joins: fix embedded.

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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.
This commit is contained in:
Sergei Petrunia
2023-10-28 12:47:55 +03:00
parent 1cd8a5ef51
commit 86351f5eda
2 changed files with 4 additions and 6 deletions
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3
mysql-test/main/join_cache_debug.result
View File

@ -24,8 +24,7 @@ select
t1.b as t1_b, t2.b as t2_b, t2.d as t2_d t1.b as t1_b, t2.b as t2_b, t2.d as t2_d
FROM t1 FROM t1
LEFT JOIN t2 ON t1.b = t2.b; LEFT JOIN t2 ON t1.b = t2.b;
SET @old_debug=@@debug_dbug; SET statement debug_dbug='+d,analyze_print_r_unpack_ops' for
SET debug_dbug='+d,analyze_print_r_unpack_ops';
analyze analyze
format=json format=json
SELECT COUNT(*) SELECT COUNT(*)

7
mysql-test/main/join_cache_debug.test
View File

@ -20,10 +20,9 @@ select
FROM t1 FROM t1
LEFT JOIN t2 ON t1.b = t2.b; LEFT JOIN t2 ON t1.b = t2.b;
SET @old_debug=@@debug_dbug; let $q=
SET debug_dbug='+d,analyze_print_r_unpack_ops'; SET statement debug_dbug='+d,analyze_print_r_unpack_ops' for
analyze
let $q= analyze
format=json format=json
SELECT COUNT(*) SELECT COUNT(*)
FROM t1_t2 FROM t1_t2