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EXPLAIN FORMAT=JSON: Full scan on NULL key (join case)

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This commit is contained in:
Sergei Petrunia
2014-12-06 03:11:03 +03:00
parent a80a797686
commit 5ee1c25fa8
5 changed files with 85 additions and 0 deletions
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sql/sql_select.cc
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@ -23687,6 +23687,7 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta, table_map prefix_tab
if (tab->ref.cond_guards[part])
{
eta->push_extra(ET_FULL_SCAN_ON_NULL_KEY);
eta->full_scan_on_null_key= true;
break;
}
}