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EXPLAIN FORMAT=JSON: support derived tables

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This commit is contained in:
Sergei Petrunia
2014-11-28 22:23:29 +03:00
parent 3a5e080d4d
commit 2ac3b39e68
6 changed files with 141 additions and 9 deletions
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10
sql/sql_select.cc
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@ -23654,6 +23654,12 @@ void JOIN_TAB::save_explain_data(Explain_table_access *eta, table_map prefix_tab
tab->cache->save_explain_data(&eta->bka_type);
}
}
/*
In case this is a derived table, here we remember the number of
subselect that used to produce it.
*/
eta->derived_select_number= table->derived_select_number;
}
/*
@ -23686,6 +23692,8 @@ int JOIN::save_explain_data_intern(Explain_query *output, bool need_tmp_table,
xpl_sel->select_id= join->select_lex->select_number;
xpl_sel->select_type= join->select_lex->type;
xpl_sel->message= message;
if (select_lex->master_unit()->derived)
xpl_sel->is_derived_table= true;
/* Setting xpl_sel->message means that all other members are invalid */
output->add_node(xpl_sel);
}
@ -23703,6 +23711,8 @@ int JOIN::save_explain_data_intern(Explain_query *output, bool need_tmp_table,
join->select_lex->set_explain_type(true);
xpl_sel->select_id= join->select_lex->select_number;
xpl_sel->select_type= join->select_lex->type;
if (select_lex->master_unit()->derived)
xpl_sel->is_derived_table= true;
JOIN_TAB* const first_top_tab= first_breadth_first_tab(join, WALK_OPTIMIZATION_TABS);