41 lines
1.8 KiB
Plaintext
41 lines
1.8 KiB
Plaintext
create table parent(a int primary key, b int, key(b)) engine=ndb
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comment="NDB_TABLE=PARTITION_BALANCE=FOR_RP_BY_LDM";
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create table child(a int primary key, b int) engine=ndb
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comment="NDB_TABLE=PARTITION_BALANCE=FOR_RP_BY_LDM";
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insert into parent values (1,1), (2,2), (3,3), (4,4);
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insert into parent select a+4, b+4 from parent;
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insert into parent select a+8, b+8 from parent;
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insert into parent select a+16, b+16 from parent;
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insert into parent select a+32, b+32 from parent;
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insert into parent select a+64, b+64 from parent;
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insert into parent select a+128, b+128 from parent;
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insert into parent select a+256, b+256 from parent;
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insert into parent select a+512, b+512 from parent;
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insert into parent select a+1024, b+1024 from parent;
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insert into parent select a+2048, b+2048 from parent;
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insert into parent select a+4096, b+4096 from parent;
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insert into child select * from parent;
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set ndb_join_pushdown = false;
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explain
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select count(*)
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from parent join child
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on (parent.b = child.a)
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where parent.b > 5;
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id select_type table partitions type possible_keys key key_len ref rows filtered Extra
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1 SIMPLE parent p0,p1,p2,p3,p4,p5,p6,p7 range b b 5 NULL 819 100.00 Using pushed condition ((`test`.`parent`.`b` > 5) and (`test`.`parent`.`b` is not null)); Using MRR
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1 SIMPLE child p0,p1,p2,p3,p4,p5,p6,p7 eq_ref PRIMARY PRIMARY 4 test.parent.b 1 100.00 NULL
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Warnings:
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Note 1003 /* select#1 */ select count(0) AS `count(*)` from `test`.`parent` join `test`.`child` where ((`test`.`child`.`a` = `test`.`parent`.`b`) and (`test`.`parent`.`b` > 5))
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Starting engines...
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call queryload(10);
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call queryload(10);
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call queryload(10);
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call queryload(10);
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Beginning alter table child partition by key(a) partitions 4;
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alter table child partition by key(a) partitions 4;
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Completed.
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Ending test. Droping table parent
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drop table parent;
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drop table child;
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drop procedure queryload;
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