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MDEV-10844: EXPLAIN FORMAT=JSON doesn't show order direction for filesort

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Currently explain format=json does not show the order direction of fields used during filesort.
This patch would remove this limitation
This commit is contained in:
Varun Gupta
2017-12-30 10:18:22 +05:30
parent 8bcbcac053
commit a118c20c81
5 changed files with 80 additions and 2 deletions
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60
mysql-test/r/explain_json.result
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@ -1582,3 +1582,63 @@ EXPLAIN
}
}
drop table t0,t1;
#
# MDEV-10844: EXPLAIN FORMAT=JSON doesn't show order direction for filesort
#
create table t1 (a int, b int);
insert into t1 values (1,2),(3,4),(2,3);
explain format=json select * from t1 order by a, b desc;
EXPLAIN
{
"query_block": {
"select_id": 1,
"read_sorted_file": {
"filesort": {
"sort_key": "t1.a, t1.b desc",
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 3,
"filtered": 100
}
}
}
}
}
explain format=json select * from t1 order by a desc, b desc;
EXPLAIN
{
"query_block": {
"select_id": 1,
"read_sorted_file": {
"filesort": {
"sort_key": "t1.a desc, t1.b desc",
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 3,
"filtered": 100
}
}
}
}
}
explain format=json select * from t1 order by a desc, b ;
EXPLAIN
{
"query_block": {
"select_id": 1,
"read_sorted_file": {
"filesort": {
"sort_key": "t1.a desc, t1.b",
"table": {
"table_name": "t1",
"access_type": "ALL",
"rows": 3,
"filtered": 100
}
}
}
}
}
drop table t1;