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a4251d6f18
vers_setup_conds() used to AND all conditions on row_start/row_end columns and store it either in the WHERE clause or in the ON clause for some table. In some cases this caused ON clause to have conditions for tables that aren't part of that ON's join. Fixed to put a table's condition always in the ON clause of the corresponding table. Removed unnecessary ... `OR row_end IS NULL` clause, it's not needed in the ON clause. Simplified handling on PS and SP.
296 lines
7.9 KiB
Plaintext
296 lines
7.9 KiB
Plaintext
create table emp
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(
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emp_id int,
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name varchar(127),
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mgr int
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) with system versioning;
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insert into emp values (1, 'bill', 0),
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(2, 'bill', 1),
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(3, 'kate', 1);
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set @ts=now(6);
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delete from emp;
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insert into emp values (4, 'john', 1);
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with ancestors as (select * from emp) select * from ancestors;
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emp_id name mgr
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4 john 1
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set @tmp= "with ancestors as (select * from emp) select * from ancestors";
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prepare stmt from @tmp;
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execute stmt;
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emp_id name mgr
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4 john 1
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drop prepare stmt;
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with ancestors as (select * from emp for system_time all) select * from ancestors;
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emp_id name mgr
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1 bill 0
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2 bill 1
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3 kate 1
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4 john 1
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set @tmp= "with ancestors as (select * from emp for system_time all) select * from ancestors";
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prepare stmt from @tmp;
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execute stmt;
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emp_id name mgr
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1 bill 0
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2 bill 1
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3 kate 1
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4 john 1
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drop prepare stmt;
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with recursive ancestors as (select * from emp) select * from ancestors;
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emp_id name mgr
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4 john 1
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set @tmp= "with recursive ancestors as (select * from emp) select * from ancestors";
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prepare stmt from @tmp;
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execute stmt;
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emp_id name mgr
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4 john 1
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drop prepare stmt;
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select emp_id from (select emp_id from emp where row_end>'2031-1-1') as tmp;
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emp_id
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4
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set @tmp= "select emp_id from (select emp_id from emp where row_end>'2031-1-1') as tmp";
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prepare stmt from @tmp;
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execute stmt;
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emp_id
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4
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drop prepare stmt;
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with recursive
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ancestors
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as
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(
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select e.emp_id, e.name, e.mgr
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from emp as e
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where name = 'john'
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union
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select ee.emp_id, ee.name, ee.mgr
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from emp as ee, ancestors as a
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where ee.mgr = a.emp_id
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)
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select * from ancestors;
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emp_id name mgr
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4 john 1
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set @tmp= "
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with recursive
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ancestors
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as
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(
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select e.emp_id, e.name, e.mgr
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from emp as e
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where name = 'john'
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union
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select ee.emp_id, ee.name, ee.mgr
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from emp as ee, ancestors as a
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where ee.mgr = a.emp_id
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)
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select * from ancestors";
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prepare stmt from @tmp;
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execute stmt;
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emp_id name mgr
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4 john 1
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drop prepare stmt;
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with recursive
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ancestors
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as
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(
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select e.emp_id, e.name, e.mgr
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from emp for system_time as of timestamp @ts as e
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where name = 'bill'
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union
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select ee.emp_id, ee.name, ee.mgr
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from emp for system_time as of timestamp @ts as ee,
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ancestors as a
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where ee.mgr = a.emp_id
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)
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select * from ancestors;
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emp_id name mgr
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1 bill 0
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2 bill 1
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3 kate 1
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set @tmp= "
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with recursive
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ancestors
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as
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(
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select e.emp_id, e.name, e.mgr
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from emp for system_time as of timestamp @ts as e
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where name = 'bill'
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union
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select ee.emp_id, ee.name, ee.mgr
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from emp for system_time as of timestamp @ts as ee,
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ancestors as a
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where ee.mgr = a.emp_id
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)
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select * from ancestors";
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prepare stmt from @tmp;
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execute stmt;
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emp_id name mgr
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1 bill 0
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2 bill 1
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3 kate 1
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drop prepare stmt;
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drop table emp;
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create or replace table t1 (x int) with system versioning;
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create or replace table t2 (y int) with system versioning;
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insert into t1 values (1);
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set @t0= now(6);
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delete from t1;
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insert into t1 values (2);
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insert into t2 values (10);
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select * from (select *, t1.row_end, t1.row_end as endo from t1) as s0;
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x row_end endo
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2 # #
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select * from (select *, t1.row_end, t2.row_start from t1, t2) as s0;
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x y row_end row_start
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2 10 # #
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# SYSTEM_TIME propagation from inner to outer
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select * from (select * from t1 for system_time as of timestamp @t0, t2) as s0;
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x y
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1 10
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with s1 as (select * from t1 for system_time as of timestamp @t0, t2) select * from s1;
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x y
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1 10
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# leading table selection
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select * from (select *, t1.row_end from t2, t1 for system_time as of timestamp @t0) as s2;
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y x row_end
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10 1 #
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with s3 as (select *, t1.row_end from t2, t1 for system_time as of timestamp @t0) select * from s3;
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y x row_end
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10 1 #
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### VIEW instead of t1
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set @q= concat("create view vt1 as select * from t1 for system_time as of timestamp '", @t0, "'");
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prepare q from @q;
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execute q;
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drop prepare q;
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create view vt2 as select * from t1;
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# SYSTEM_TIME propagation from view
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select * from vt1;
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x
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1
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# SYSTEM_TIME propagation from inner to outer
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select * from (select * from vt1, t2) as s0;
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x y
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1 10
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### SYSTEM_TIME clash
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select * from (select * from t1 for system_time all) for system_time all as dt0;
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ERROR HY000: Table `dt0` is not system-versioned
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select * from vt1 for system_time all;
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ERROR HY000: Table `vt1` is not system-versioned
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with dt1 as (select * from t1 for system_time all)
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select * from dt1 for system_time all;
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ERROR HY000: Table `dt1` is not system-versioned
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### UNION
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set @t1= now(6);
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delete from t2;
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insert into t2 values (3);
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# SYSTEM_TIME is not propagated
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select x from t1 union
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select y from t2;
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x
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2
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3
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select x from t1 for system_time as of @t0 union
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select y from t2;
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x
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1
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3
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select x from t1 union
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select y from t2 for system_time as of @t1;
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x
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2
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10
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select x from t1 for system_time as of @t0 union
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select y from t2 for system_time as of @t1;
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x
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1
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10
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# LEFT/RIGHT JOIN
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create or replace table t1 (x int, y int) with system versioning;
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create or replace table t2 (x int, y int) with system versioning;
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insert into t1 values (1, 1), (1, 2), (1, 3), (4, 4), (5, 5);
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insert into t2 values (1, 2), (2, 1), (3, 1);
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## Outer or inner SYSTEM_TIME produces same expression
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 5 100.00 Using where; Using join buffer (flat, BNL join)
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Query A:
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Note 1003 select `test`.`t1`.`x` AS `x`,`test`.`t1`.`y` AS `y1`,`test`.`t2`.`x` AS `x2`,`test`.`t2`.`y` AS `y2` from `test`.`t1` FOR SYSTEM_TIME ALL join `test`.`t2` FOR SYSTEM_TIME ALL where `test`.`t1`.`x` = `test`.`t2`.`x` and `test`.`t2`.`row_end` > <cache>(current_timestamp(6)) and `test`.`t2`.`row_start` <= <cache>(current_timestamp(6)) and `test`.`t1`.`row_end` > <cache>(current_timestamp(6)) and `test`.`t1`.`row_start` <= <cache>(current_timestamp(6))
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id select_type table type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE t2 ALL NULL NULL NULL NULL 3 100.00 Using where
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1 SIMPLE t1 ALL NULL NULL NULL NULL 5 100.00 Using where; Using join buffer (flat, BNL join)
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Query B:
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Note 1003 select `test`.`t1`.`x` AS `x`,`test`.`t1`.`y` AS `y1`,`test`.`t2`.`x` AS `x2`,`test`.`t2`.`y` AS `y2` from `test`.`t1` FOR SYSTEM_TIME ALL join `test`.`t2` FOR SYSTEM_TIME ALL where `test`.`t1`.`x` = `test`.`t2`.`x` and `test`.`t2`.`row_end` > <cache>(current_timestamp(6)) and `test`.`t2`.`row_start` <= <cache>(current_timestamp(6)) and `test`.`t1`.`row_end` > <cache>(current_timestamp(6)) and `test`.`t1`.`row_start` <= <cache>(current_timestamp(6))
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Fine result: queries A and B are equal.
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## LEFT JOIN: t1, t2 versioned
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select * from (
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select t1.x as LJ1_x1, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 left join t2 on t1.x = t2.x)
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as derived;
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LJ1_x1 y1 x2 y2
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1 1 1 2
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1 2 1 2
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1 3 1 2
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4 4 NULL NULL
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5 5 NULL NULL
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alter table t2 drop system versioning;
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## LEFT JOIN: t1 versioned
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select * from (
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select t1.x as LJ2_x1, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 left join t2 on t1.x = t2.x)
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as derived;
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LJ2_x1 y1 x2 y2
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1 1 1 2
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1 2 1 2
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1 3 1 2
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4 4 NULL NULL
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5 5 NULL NULL
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alter table t1 drop system versioning;
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alter table t2 add system versioning;
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## LEFT JOIN: t2 versioned
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select * from (
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select t1.x as LJ3_x1, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 left join t2 on t1.x = t2.x)
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as derived;
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LJ3_x1 y1 x2 y2
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1 1 1 2
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1 2 1 2
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1 3 1 2
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4 4 NULL NULL
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5 5 NULL NULL
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alter table t1 add system versioning;
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## RIGHT JOIN: t1, t2 versioned
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select * from (
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select t1.x as RJ1_x1, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 right join t2 on t1.x = t2.x)
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as derived;
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RJ1_x1 y1 x2 y2
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1 1 1 2
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1 2 1 2
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1 3 1 2
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NULL NULL 2 1
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NULL NULL 3 1
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alter table t2 drop system versioning;
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## RIGHT JOIN: t1 versioned
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select * from (
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select t1.x as RJ2_x1, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 right join t2 on t1.x = t2.x)
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as derived;
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RJ2_x1 y1 x2 y2
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1 1 1 2
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1 2 1 2
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1 3 1 2
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NULL NULL 2 1
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NULL NULL 3 1
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alter table t1 drop system versioning;
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alter table t2 add system versioning;
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## RIGHT JOIN: t2 versioned
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select * from (
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select t1.x as RJ3_x1, t1.y as y1, t2.x as x2, t2.y as y2
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from t1 right join t2 on t1.x = t2.x)
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as derived;
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RJ3_x1 y1 x2 y2
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1 1 1 2
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1 2 1 2
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1 3 1 2
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NULL NULL 2 1
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NULL NULL 3 1
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drop table t1, t2;
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drop view vt1, vt2;
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