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MDEV-3798: EXPLAIN UPDATE/DELETE

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- Generate correct contents of `Extra` column for UPDATEs/DELETEs that use quick selects
- UPDATEs with used_key_is_modified=true will show "Using buffer"
This commit is contained in:
Sergey Petrunya
2013-10-09 09:40:33 +04:00
parent 69e6a2bb22
commit 161d687594
5 changed files with 73 additions and 20 deletions
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3
sql/sql_explain.h
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@@ -486,10 +486,13 @@ public:
StringBuffer<128> key_len_str;
StringBuffer<64> mrr_type;
Explain_quick_select *quick_info;
bool using_where;
ha_rows rows;
bool using_filesort;
bool using_io_buffer;
virtual int print_explain(Explain_query *query, select_result_sink *output,
uint8 explain_flags);