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EXPLAIN FORMAT=JSON: Support "range checked for each record"

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This commit is contained in:
Sergei Petrunia 2014-12-06 02:23:37 +03:00
commit a80a797686
5 changed files with 82 additions and 15 deletions
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19
sql/sql_explain.h
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@ -538,6 +538,18 @@ private:
};
/*
Data structure for "range checked for each record".
It's a set of keys, tabular explain prints hex bitmap, json prints key names.
*/
class Explain_range_checked_fer : public Sql_alloc
{
public:
String_list key_set;
key_map keys_map;
};
/*
EXPLAIN data structure for a single JOIN_TAB.
*/
@ -549,6 +561,7 @@ public:
derived_select_number(0),
non_merged_sjm_number(0),
extra_tags(root),
range_checked_fer(NULL),
start_dups_weedout(false),
end_dups_weedout(false),
where_cond(NULL),
@ -618,9 +631,9 @@ public:
// Valid if ET_USING tag is present
Explain_quick_select *quick_info;
// valid with ET_RANGE_CHECKED_FOR_EACH_RECORD
key_map range_checked_map;
/* Non-NULL values means this tab uses "range checked for each record" */
Explain_range_checked_fer *range_checked_fer;
// valid with ET_USING_JOIN_BUFFER
EXPLAIN_BKA_TYPE bka_type;