Details
Major Description
When set it on my.cnf
[mysqld]
slow_query_log=ON
log_queries_not_using_indexes=OFF
log_slow_filter=
Run query
create database slow;
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create table slow.t(int id, int k);
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insert into slow.t values (1, 1);
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insert into slow.t values (2, 2);
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select * from slow.t;
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Then the query not using indexes will be logged into slow log. The is a wrong behavior due to document and is different from previous version like 10.2.
Analysis
On file sql_parse.cc
if ((thd->server_status & |
(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
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!(thd->query_plan_flags & QPLAN_STATUS) &&
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!slow_filter_masked(thd, QPLAN_NOT_USING_INDEX))
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{
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thd->query_plan_flags|= QPLAN_NOT_USING_INDEX;
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/* We are always logging no index queries if enabled in filter */ |
thd->server_status|= SERVER_QUERY_WAS_SLOW;
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}
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The slow_filter_masked is
static bool slow_filter_masked(THD *thd, ulonglong mask) |
{
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return thd->variables.log_slow_filter && !(thd->variables.log_slow_filter & mask); |
}
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Which means the function return false when `log_slow_filter` is 0, which is set when in config it is a empty string. And then log_queries_not_using_indexes=OFF does not work and always log the not using indexes queries.
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