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"WL6369 Explain for Connection"
QUERY: SELECT group_concat(c order by (select c from t2 where t2.a=t1.a limit 1)) as grp from t1
STATUS:NOT_EQUAL
SYNC_POINT:before_reset_query_plan
Diff: EXPLAIN NORMAL vs OTHER
@@ -39,2 +39,3 @@
"filtered": "25.00",
+ "using_where": true,
"cost_info": {
@@ -48,4 +49,3 @@
"c"
- ],
- "attached_condition": "(`test`.`t2`.`a` = `test`.`t1`.`a`)"
+ ]
}
QUERY: SELECT * FROM t1 UNION SELECT * FROM t1 ORDER BY (SELECT a FROM t2 WHERE b = 12)
STATUS:NOT_EQUAL
SYNC_POINT:before_reset_query_plan
Diff: EXPLAIN NORMAL vs OTHER
@@ -79,2 +79,3 @@
"filtered": "50.00",
+ "using_where": true,
"cost_info": {
@@ -87,4 +88,3 @@
"b"
- ],
- "attached_condition": "(`test`.`t2`.`b` = 12)"
+ ]
}
QUERY: SELECT SQL_CALC_FOUND_ROWS 'foo' UNION SELECT 'bar' LIMIT 0
STATUS: EQUAL