Skip to content

H
h2database
提交 362c1398 authored 作者: Noel Grandin's avatar Noel Grandin
浏览文件
操作

fix pagestore index calculations 

which results in (as far as I can see) quite a few cases where we now pick the faster option of an index instead of scanning over the pagestore table data
上级 fb7e94c8
显示空白字符变更
内嵌 并排
正在显示 包含 41 行增加 和 24 行删除
h2/src/main/org/h2/index/PageDataIndex.java
浏览文件 @ 362c1398
...@@ -312,8 +312,11 @@ public class PageDataIndex extends PageIndex { ...@@ -312,8 +312,11 @@ public class PageDataIndex extends PageIndex {
public double getCost(Session session, int[] masks, public double getCost(Session session, int[] masks,
TableFilter[] filters, int filter, SortOrder sortOrder, TableFilter[] filters, int filter, SortOrder sortOrder,
AllColumnsForPlan allColumnsSet) { AllColumnsForPlan allColumnsSet) {
// The +200 is so that indexes that can return the same data, but have less columns, will take precedence.
// This all works out easier in the MVStore case, because MVStore uses the same cost calculation
// code for the ScanIndex (i.e. the MVPrimaryIndex) and all other indices.
return 10 * (tableData.getRowCountApproximation() + return 10 * (tableData.getRowCountApproximation() +
Constants.COST_ROW_OFFSET); Constants.COST_ROW_OFFSET) + 200;
} }
@Override @Override
......
h2/src/test/org/h2/test/scripts/testScript.sql
浏览文件 @ 362c1398
...@@ -484,7 +484,8 @@ explain insert into test(id) direct sorted select x from system_range(1, 100); ...@@ -484,7 +484,8 @@ explain insert into test(id) direct sorted select x from system_range(1, 100);
>> INSERT INTO PUBLIC.TEST(ID) DIRECT SORTED SELECT X FROM SYSTEM_RANGE(1, 100) /* PUBLIC.RANGE_INDEX */ >> INSERT INTO PUBLIC.TEST(ID) DIRECT SORTED SELECT X FROM SYSTEM_RANGE(1, 100) /* PUBLIC.RANGE_INDEX */
explain select * from test limit 10 sample_size 10; explain select * from test limit 10 sample_size 10;
>> SELECT TEST.ID FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */ LIMIT 10 SAMPLE_SIZE 10 #+mvStore#>> SELECT TEST.ID FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */ LIMIT 10 SAMPLE_SIZE 10
#-mvStore#>> SELECT TEST.ID FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2 */ LIMIT 10 SAMPLE_SIZE 10
drop table test; drop table test;
> ok > ok
...@@ -1234,7 +1235,8 @@ insert into t2 select x from system_range(1, 1000); ...@@ -1234,7 +1235,8 @@ insert into t2 select x from system_range(1, 1000);
> update count: 1000 > update count: 1000
explain select count(*) from t1 where t1.id in ( select t2.id from t2 ); explain select count(*) from t1 where t1.id in ( select t2.id from t2 );
>> SELECT COUNT(*) FROM PUBLIC.T1 /* PUBLIC.PRIMARY_KEY_A: ID IN(SELECT T2.ID FROM PUBLIC.T2 /++ PUBLIC.T2.tableScan ++/) */ WHERE T1.ID IN( SELECT T2.ID FROM PUBLIC.T2 /* PUBLIC.T2.tableScan */) #+mvStore#>> SELECT COUNT(*) FROM PUBLIC.T1 /* PUBLIC.PRIMARY_KEY_A: ID IN(SELECT T2.ID FROM PUBLIC.T2 /++ PUBLIC.T2.tableScan ++/) */ WHERE T1.ID IN( SELECT T2.ID FROM PUBLIC.T2 /* PUBLIC.T2.tableScan */)
#-mvStore#>> SELECT COUNT(*) FROM PUBLIC.T1 /* PUBLIC.PRIMARY_KEY_A: ID IN(SELECT T2.ID FROM PUBLIC.T2 /++ PUBLIC.PRIMARY_KEY_A5 ++/) */ WHERE T1.ID IN( SELECT T2.ID FROM PUBLIC.T2 /* PUBLIC.PRIMARY_KEY_A5 */)
select count(*) from t1 where t1.id in ( select t2.id from t2 ); select count(*) from t1 where t1.id in ( select t2.id from t2 );
> COUNT(*) > COUNT(*)
...@@ -1559,7 +1561,8 @@ explain select * from test where id = 1; ...@@ -1559,7 +1561,8 @@ explain select * from test where id = 1;
>> SELECT TEST.ID FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2: ID = 1 */ WHERE ID = 1 >> SELECT TEST.ID FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2: ID = 1 */ WHERE ID = 1
EXPLAIN SELECT * FROM TEST WHERE ID = (SELECT MAX(ID) FROM TEST); EXPLAIN SELECT * FROM TEST WHERE ID = (SELECT MAX(ID) FROM TEST);
>> SELECT TEST.ID FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2: ID = (SELECT MAX(ID) FROM PUBLIC.TEST /++ PUBLIC.TEST.tableScan ++/ /++ direct lookup ++/) */ WHERE ID = (SELECT MAX(ID) FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */ /* direct lookup */) #+mvStore#>> SELECT TEST.ID FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2: ID = (SELECT MAX(ID) FROM PUBLIC.TEST /++ PUBLIC.TEST.tableScan ++/ /++ direct lookup ++/) */ WHERE ID = (SELECT MAX(ID) FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */ /* direct lookup */)
#-mvStore#>> SELECT TEST.ID FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2: ID = (SELECT MAX(ID) FROM PUBLIC.TEST /++ PUBLIC.PRIMARY_KEY_2 ++/ /++ direct lookup ++/) */ WHERE ID = (SELECT MAX(ID) FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2 */ /* direct lookup */)
drop table test; drop table test;
> ok > ok
...@@ -2888,9 +2891,9 @@ CREATE TABLE X (ID INTEGER PRIMARY KEY); ...@@ -2888,9 +2891,9 @@ CREATE TABLE X (ID INTEGER PRIMARY KEY);
insert into x values(0), (1), (10); insert into x values(0), (1), (10);
> update count: 3 > update count: 3
SELECT t1.ID, (SELECT t1.id || ':' || AVG(t2.ID) FROM X t2) FROM X t1; SELECT t1.ID, (SELECT t1.id || ':' || AVG(t2.ID) FROM X t2) AS col2 FROM X t1;
> ID SELECT ((T1.ID || ':') || AVG(T2.ID)) FROM PUBLIC.X T2 /* PUBLIC.X.tableScan */ /* scanCount: 4 */ > ID COL2
> -- -------------------------------------------------------------------------------------------------- > -- ----
> 0 0:3 > 0 0:3
> 1 1:3 > 1 1:3
> 10 10:3 > 10 10:3
...@@ -2913,9 +2916,9 @@ select * from test order by id; ...@@ -2913,9 +2916,9 @@ select * from test order by id;
> 3 33 > 3 33
> rows (ordered): 3 > rows (ordered): 3
select rownum, (select count(*) from test), rownum from test; select rownum, (select count(*) from test) as col2, rownum from test;
> ROWNUM() SELECT COUNT(*) FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */ /* direct lookup */ ROWNUM() > ROWNUM() COL2 ROWNUM()
> -------- -------------------------------------------------------------------------------- -------- > -------- ---- --------
> 1 3 1 > 1 3 1
> 2 3 2 > 2 3 2
> 3 3 3 > 3 3 3
...@@ -3167,7 +3170,8 @@ select * from test t1 where id in(id); ...@@ -3167,7 +3170,8 @@ select * from test t1 where id in(id);
> rows: 2 > rows: 2
explain select * from test t1 where id in(select id from test); explain select * from test t1 where id in(select id from test);
>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID IN(SELECT ID FROM PUBLIC.TEST /++ PUBLIC.TEST.tableScan ++/) */ WHERE ID IN( SELECT ID FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */) #+mvStore#>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID IN(SELECT ID FROM PUBLIC.TEST /++ PUBLIC.TEST.tableScan ++/) */ WHERE ID IN( SELECT ID FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */)
#-mvStore#>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID IN(SELECT ID FROM PUBLIC.TEST /++ PUBLIC.PRIMARY_KEY_2 ++/) */ WHERE ID IN( SELECT ID FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2 */)
select * from test t1 where id in(select id from test); select * from test t1 where id in(select id from test);
> ID NAME > ID NAME
...@@ -3177,7 +3181,8 @@ select * from test t1 where id in(select id from test); ...@@ -3177,7 +3181,8 @@ select * from test t1 where id in(select id from test);
> rows: 2 > rows: 2
explain select * from test t1 where id in(1, select max(id) from test); explain select * from test t1 where id in(1, select max(id) from test);
>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID IN(1, (SELECT MAX(ID) FROM PUBLIC.TEST /++ PUBLIC.TEST.tableScan ++/ /++ direct lookup ++/)) */ WHERE ID IN(1, (SELECT MAX(ID) FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */ /* direct lookup */)) #+mvStore#>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID IN(1, (SELECT MAX(ID) FROM PUBLIC.TEST /++ PUBLIC.TEST.tableScan ++/ /++ direct lookup ++/)) */ WHERE ID IN(1, (SELECT MAX(ID) FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */ /* direct lookup */))
#-mvStore#>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID IN(1, (SELECT MAX(ID) FROM PUBLIC.TEST /++ PUBLIC.PRIMARY_KEY_2 ++/ /++ direct lookup ++/)) */ WHERE ID IN(1, (SELECT MAX(ID) FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2 */ /* direct lookup */))
select * from test t1 where id in(1, select max(id) from test); select * from test t1 where id in(1, select max(id) from test);
> ID NAME > ID NAME
...@@ -3583,7 +3588,8 @@ create table test(id int primary key); ...@@ -3583,7 +3588,8 @@ create table test(id int primary key);
> ok > ok
explain select * from test a inner join test b left outer join test c on c.id = a.id; explain select * from test a inner join test b left outer join test c on c.id = a.id;
>> SELECT A.ID, C.ID, B.ID FROM PUBLIC.TEST A /* PUBLIC.TEST.tableScan */ LEFT OUTER JOIN PUBLIC.TEST C /* PUBLIC.PRIMARY_KEY_2: ID = A.ID */ ON C.ID = A.ID INNER JOIN PUBLIC.TEST B /* PUBLIC.TEST.tableScan */ ON 1=1 #+mvStore#>> SELECT A.ID, C.ID, B.ID FROM PUBLIC.TEST A /* PUBLIC.TEST.tableScan */ LEFT OUTER JOIN PUBLIC.TEST C /* PUBLIC.PRIMARY_KEY_2: ID = A.ID */ ON C.ID = A.ID INNER JOIN PUBLIC.TEST B /* PUBLIC.TEST.tableScan */ ON 1=1
#-mvStore#>> SELECT A.ID, C.ID, B.ID FROM PUBLIC.TEST A /* PUBLIC.PRIMARY_KEY_2 */ LEFT OUTER JOIN PUBLIC.TEST C /* PUBLIC.PRIMARY_KEY_2: ID = A.ID */ ON C.ID = A.ID INNER JOIN PUBLIC.TEST B /* PUBLIC.PRIMARY_KEY_2 */ ON 1=1
SELECT T.ID FROM TEST "T"; SELECT T.ID FROM TEST "T";
> ID > ID
...@@ -4548,10 +4554,12 @@ update test set (id, name)=(select id+1, name || 'Ho' from test t1 where test.id ...@@ -4548,10 +4554,12 @@ update test set (id, name)=(select id+1, name || 'Ho' from test t1 where test.id
> update count: 2 > update count: 2
explain update test set (id, name)=(id+1, name || 'Hi'); explain update test set (id, name)=(id+1, name || 'Hi');
>> UPDATE PUBLIC.TEST /* PUBLIC.TEST.tableScan */ SET ID = ARRAY_GET(((ID + 1), (NAME || 'Hi')), 1), NAME = ARRAY_GET(((ID + 1), (NAME || 'Hi')), 2) #+mvStore#>> UPDATE PUBLIC.TEST /* PUBLIC.TEST.tableScan */ SET ID = ARRAY_GET(((ID + 1), (NAME || 'Hi')), 1), NAME = ARRAY_GET(((ID + 1), (NAME || 'Hi')), 2)
#-mvStore#>> UPDATE PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2 */ SET ID = ARRAY_GET(((ID + 1), (NAME || 'Hi')), 1), NAME = ARRAY_GET(((ID + 1), (NAME || 'Hi')), 2)
explain update test set (id, name)=(select id+1, name || 'Ho' from test t1 where test.id=t1.id); explain update test set (id, name)=(select id+1, name || 'Ho' from test t1 where test.id=t1.id);
>> UPDATE PUBLIC.TEST /* PUBLIC.TEST.tableScan */ SET ID = ARRAY_GET((SELECT (ID + 1), (NAME || 'Ho') FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID = TEST.ID */ WHERE TEST.ID = T1.ID), 1), NAME = ARRAY_GET((SELECT (ID + 1), (NAME || 'Ho') FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID = TEST.ID */ WHERE TEST.ID = T1.ID), 2) #+mvStore#>> UPDATE PUBLIC.TEST /* PUBLIC.TEST.tableScan */ SET ID = ARRAY_GET((SELECT (ID + 1), (NAME || 'Ho') FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID = TEST.ID */ WHERE TEST.ID = T1.ID), 1), NAME = ARRAY_GET((SELECT (ID + 1), (NAME || 'Ho') FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID = TEST.ID */ WHERE TEST.ID = T1.ID), 2)
#-mvStore#>> UPDATE PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2 */ SET ID = ARRAY_GET((SELECT (ID + 1), (NAME || 'Ho') FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID = TEST.ID */ WHERE TEST.ID = T1.ID), 1), NAME = ARRAY_GET((SELECT (ID + 1), (NAME || 'Ho') FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID = TEST.ID */ WHERE TEST.ID = T1.ID), 2)
select * from test; select * from test;
> ID NAME > ID NAME
...@@ -5467,10 +5475,12 @@ EXPLAIN SELECT * FROM TEST WHERE ID=1 GROUP BY NAME, ID; ...@@ -5467,10 +5475,12 @@ EXPLAIN SELECT * FROM TEST WHERE ID=1 GROUP BY NAME, ID;
>> SELECT TEST.ID, TEST.NAME FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2: ID = 1 */ WHERE ID = 1 GROUP BY NAME, ID >> SELECT TEST.ID, TEST.NAME FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2: ID = 1 */ WHERE ID = 1 GROUP BY NAME, ID
EXPLAIN PLAN FOR UPDATE TEST SET NAME='Hello', ID=1 WHERE NAME LIKE 'T%' ESCAPE 'x'; EXPLAIN PLAN FOR UPDATE TEST SET NAME='Hello', ID=1 WHERE NAME LIKE 'T%' ESCAPE 'x';
>> UPDATE PUBLIC.TEST /* PUBLIC.TEST.tableScan */ SET NAME = 'Hello', ID = 1 WHERE NAME LIKE 'T%' ESCAPE 'x' #+mvStore#>> UPDATE PUBLIC.TEST /* PUBLIC.TEST.tableScan */ SET NAME = 'Hello', ID = 1 WHERE NAME LIKE 'T%' ESCAPE 'x'
#-mvStore#>> UPDATE PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2 */ SET NAME = 'Hello', ID = 1 WHERE NAME LIKE 'T%' ESCAPE 'x'
EXPLAIN PLAN FOR DELETE FROM TEST; EXPLAIN PLAN FOR DELETE FROM TEST;
>> DELETE FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */ #+mvStore#>> DELETE FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */
#-mvStore#>> DELETE FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2 */
EXPLAIN PLAN FOR SELECT NAME, COUNT(*) FROM TEST GROUP BY NAME HAVING COUNT(*) > 1; EXPLAIN PLAN FOR SELECT NAME, COUNT(*) FROM TEST GROUP BY NAME HAVING COUNT(*) > 1;
>> SELECT NAME, COUNT(*) FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */ GROUP BY NAME HAVING COUNT(*) > 1 >> SELECT NAME, COUNT(*) FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */ GROUP BY NAME HAVING COUNT(*) > 1
...@@ -5491,13 +5501,16 @@ EXPLAIN PLAN FOR SELECT * FROM TEST T1 WHERE ID IN(1, 2); ...@@ -5491,13 +5501,16 @@ EXPLAIN PLAN FOR SELECT * FROM TEST T1 WHERE ID IN(1, 2);
>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID IN(1, 2) */ WHERE ID IN(1, 2) >> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID IN(1, 2) */ WHERE ID IN(1, 2)
EXPLAIN PLAN FOR SELECT * FROM TEST T1 WHERE ID IN(SELECT ID FROM TEST); EXPLAIN PLAN FOR SELECT * FROM TEST T1 WHERE ID IN(SELECT ID FROM TEST);
>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID IN(SELECT ID FROM PUBLIC.TEST /++ PUBLIC.TEST.tableScan ++/) */ WHERE ID IN( SELECT ID FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */) #+mvStore#>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID IN(SELECT ID FROM PUBLIC.TEST /++ PUBLIC.TEST.tableScan ++/) */ WHERE ID IN( SELECT ID FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */)
#-mvStore#>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.PRIMARY_KEY_2: ID IN(SELECT ID FROM PUBLIC.TEST /++ PUBLIC.PRIMARY_KEY_2 ++/) */ WHERE ID IN( SELECT ID FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2 */)
EXPLAIN PLAN FOR SELECT * FROM TEST T1 WHERE ID NOT IN(SELECT ID FROM TEST); EXPLAIN PLAN FOR SELECT * FROM TEST T1 WHERE ID NOT IN(SELECT ID FROM TEST);
>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.TEST.tableScan */ WHERE NOT (ID IN( SELECT ID FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */)) #+mvStore#>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.TEST.tableScan */ WHERE NOT (ID IN( SELECT ID FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */))
#-mvStore#>> SELECT T1.ID, T1.NAME FROM PUBLIC.TEST T1 /* PUBLIC.TEST.tableScan */ WHERE NOT (ID IN( SELECT ID FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2 */))
EXPLAIN PLAN FOR SELECT CAST(ID AS VARCHAR(255)) FROM TEST; EXPLAIN PLAN FOR SELECT CAST(ID AS VARCHAR(255)) FROM TEST;
>> SELECT CAST(ID AS VARCHAR(255)) FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */ #+mvStore#>> SELECT CAST(ID AS VARCHAR(255)) FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */
#-mvStore#>> SELECT CAST(ID AS VARCHAR(255)) FROM PUBLIC.TEST /* PUBLIC.PRIMARY_KEY_2 */
EXPLAIN PLAN FOR SELECT LEFT(NAME, 2) FROM TEST; EXPLAIN PLAN FOR SELECT LEFT(NAME, 2) FROM TEST;
>> SELECT LEFT(NAME, 2) FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */ >> SELECT LEFT(NAME, 2) FROM PUBLIC.TEST /* PUBLIC.TEST.tableScan */
...@@ -5606,7 +5619,8 @@ EXPLAIN SELECT * FROM CHILDREN EXCEPT SELECT * FROM CHILDREN WHERE CLASS=0; ...@@ -5606,7 +5619,8 @@ EXPLAIN SELECT * FROM CHILDREN EXCEPT SELECT * FROM CHILDREN WHERE CLASS=0;
>> (SELECT CHILDREN.ID, CHILDREN.NAME, CHILDREN.CLASS FROM PUBLIC.CHILDREN /* PUBLIC.CHILDREN.tableScan */) EXCEPT (SELECT CHILDREN.ID, CHILDREN.NAME, CHILDREN.CLASS FROM PUBLIC.CHILDREN /* PUBLIC.CHILDREN.tableScan */ WHERE CLASS = 0) >> (SELECT CHILDREN.ID, CHILDREN.NAME, CHILDREN.CLASS FROM PUBLIC.CHILDREN /* PUBLIC.CHILDREN.tableScan */) EXCEPT (SELECT CHILDREN.ID, CHILDREN.NAME, CHILDREN.CLASS FROM PUBLIC.CHILDREN /* PUBLIC.CHILDREN.tableScan */ WHERE CLASS = 0)
EXPLAIN SELECT CLASS FROM CHILDREN INTERSECT SELECT ID FROM CLASSES; EXPLAIN SELECT CLASS FROM CHILDREN INTERSECT SELECT ID FROM CLASSES;
>> (SELECT CLASS FROM PUBLIC.CHILDREN /* PUBLIC.CHILDREN.tableScan */) INTERSECT (SELECT ID FROM PUBLIC.CLASSES /* PUBLIC.CLASSES.tableScan */) #+mvStore#>> (SELECT CLASS FROM PUBLIC.CHILDREN /* PUBLIC.CHILDREN.tableScan */) INTERSECT (SELECT ID FROM PUBLIC.CLASSES /* PUBLIC.CLASSES.tableScan */)
#-mvStore#>> (SELECT CLASS FROM PUBLIC.CHILDREN /* PUBLIC.CHILDREN.tableScan */) INTERSECT (SELECT ID FROM PUBLIC.CLASSES /* PUBLIC.PRIMARY_KEY_5 */)
SELECT CLASS FROM CHILDREN INTERSECT SELECT ID FROM CLASSES; SELECT CLASS FROM CHILDREN INTERSECT SELECT ID FROM CLASSES;
> CLASS > CLASS
......
Markdown 格式
0% 或
您添加了 0 人 到此讨论。请谨慎行事。
请先完成此评论的编辑！
请 注册 或者 后发表评论