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MDEV-7970: EXPLAIN FORMAT=JSON does not print HAVING

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Printing non-trivial HAVING added.
This commit is contained in:
Oleksandr Byelkin
2015-09-09 16:29:50 +02:00
parent 79140b0383
commit da3ec3d421
7 changed files with 271 additions and 3 deletions
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84
mysql-test/r/explain_json.result
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@ -799,6 +799,7 @@ EXPLAIN
{
"query_block": {
"select_id": 2,
"having_condition": "trigcond(<is_not_null_test>(t1.a))",
"full-scan-on-null_key": {
"table": {
"table_name": "t1",
@ -1110,3 +1111,86 @@ EXPLAIN
}
}
DROP TABLE t1;
#
# MDEV-7970: EXPLAIN FORMAT=JSON does not print HAVING
#
create table t0(a int);
insert into t0 values (0),(1),(2),(3);
create table t1(a int);
insert into t1 select A.a + B.a* 10 + C.a * 100 from t0 A, t0 B, t0 C;
create table t2 (
a int,
b int,
key (a)
);
insert into t2 select A.a*1000 + B.a, A.a*1000 + B.a from t0 A, t1 B;
# normal HAVING
explain format=json select a, max(b) as TOP from t2 group by a having TOP > a;
EXPLAIN
{
"query_block": {
"select_id": 1,
"having_condition": "(TOP > t2.a)",
"filesort": {
"temporary_table": {
"function": "buffer",
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 256,
"filtered": 100
}
}
}
}
}
# HAVING is always TRUE (not printed)
explain format=json select a, max(b) as TOP from t2 group by a having 1<>2;
EXPLAIN
{
"query_block": {
"select_id": 1,
"filesort": {
"temporary_table": {
"function": "buffer",
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 256,
"filtered": 100
}
}
}
}
}
# HAVING is always FALSE (intercepted by message)
explain format=json select a, max(b) as TOP from t2 group by a having 1=2;
EXPLAIN
{
"query_block": {
"select_id": 1,
"table": {
"message": "Impossible HAVING"
}
}
}
# HAVING is absent
explain format=json select a, max(b) as TOP from t2 group by a;
EXPLAIN
{
"query_block": {
"select_id": 1,
"filesort": {
"temporary_table": {
"function": "buffer",
"table": {
"table_name": "t2",
"access_type": "ALL",
"rows": 256,
"filtered": 100
}
}
}
}
}
drop table t0, t1, t2;