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MDEV-6109: EXPLAIN JSON

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Add pretty-printing of possible_keys column.
This commit is contained in:
Sergei Petrunia
2014-08-12 15:02:09 +04:00
parent 33d53c4c24
commit 84485dbe7c
4 changed files with 306 additions and 25 deletions
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31
mysql-test/r/explain_json.result
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@ -38,4 +38,35 @@ EXPLAIN
}
}
}
create table t1 (a int, b int, filler char(32), key(a));
insert into t1
select
A.a + B.a* 10 + C.a * 100,
A.a + B.a* 10 + C.a * 100,
'filler'
from t0 A, t0 B, t0 C;
explain format=json select * from t0,t1 where t1.a=t0.a;
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"table_name": "t0",
"access_type": "ALL",
"rows": 10,
"filtered": 100,
"attached_condition": "(t0.a is not null)"
},
"table": {
"table_name": "t1",
"access_type": "ref",
"possible_keys": ["a"],
"key": "a",
"used_key_parts": "TODO",
"key_length": "5",
"rows": 1,
"filtered": 100
}
}
}
drop table t0;