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use test; create table parent(a int primary key, b int not null, key(b)) engine=myisam; create table child(a int, b int, primary key(a,b), key(b)) engine=myisam; insert into parent values (1,1), (2,2), (3,3), (4,4); insert into parent select a+4, b+4 from parent; insert into parent select a+8, b+8 from parent; insert into parent select a+16, b+16 from parent; insert into parent select a+32, b+32 from parent; insert into parent select a+64, b+64 from parent; insert into parent select a+128, b+128 from parent; insert into parent select a+256, b+256 from parent; insert into parent select a+512, b+512 from parent; insert into parent select a+1024, b+1024 from parent; insert into parent select a+(2*1024), b+(2*1024) from parent; insert into parent select a+(4*1024), b+(4*1024) from parent; insert into parent select a+(8*1024), b+(8*1024) from parent; insert into parent select a+(16*1024), b+(16*1024) from parent; insert into child select * from parent; alter table parent engine=ndb; alter table child engine=ndb; show variables like 'server_id'; Variable_name Value server_id 1 set ndb_join_pushdown = true; ============================================ Early 'online' drop of REF'ed child's KEY b. ============================================ explain select straight_join count(*) from parent join child on child.b = parent.a where parent.b > 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE parent p0,p1,p2,p3,p4,p5,p6,p7 range PRIMARY,b b 4 NULL ### ### Parent of 2 pushed join@1; Using where with pushed condition (`test`.`parent`.`b` > 5); Using MRR 1 SIMPLE child p0,p1,p2,p3,p4,p5,p6,p7 ref b b 4 test.parent.a ### ### Child of 'parent' in pushed join@1 Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `count(*)` from `test`.`parent` join `test`.`child` where ((`test`.`child`.`b` = `test`.`parent`.`a`) and (`test`.`parent`.`b` > 5)) alter table child algorithm=inplace, drop key b; commit; alter table child add key(b); ============================================ Late 'online' drop of REF'ed child's KEY b. ============================================ explain select straight_join count(*) from parent join child on child.b = parent.a where parent.b > 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE parent p0,p1,p2,p3,p4,p5,p6,p7 range PRIMARY,b b 4 NULL ### ### Parent of 2 pushed join@1; Using where with pushed condition (`test`.`parent`.`b` > 5); Using MRR 1 SIMPLE child p0,p1,p2,p3,p4,p5,p6,p7 ref b b 4 test.parent.a ### ### Child of 'parent' in pushed join@1 Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `count(*)` from `test`.`parent` join `test`.`child` where ((`test`.`child`.`b` = `test`.`parent`.`a`) and (`test`.`parent`.`b` > 5)) alter table child algorithm=inplace, drop key b; commit; alter table child add key(b); ============================================ Early drop of EQ_REF'ed child's PRIMARY KEY. ============================================ explain select straight_join count(*) from parent join child on child.a = parent.a and child.b = parent.b where parent.b > 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE parent p0,p1,p2,p3,p4,p5,p6,p7 range PRIMARY,b b 4 NULL ### ### Parent of 2 pushed join@1; Using where with pushed condition (`test`.`parent`.`b` > 5); Using MRR 1 SIMPLE child p0,p1,p2,p3,p4,p5,p6,p7 eq_ref PRIMARY,b PRIMARY 8 test.parent.a,test.parent.b ### ### Child of 'parent' in pushed join@1 Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `count(*)` from `test`.`parent` join `test`.`child` where ((`test`.`child`.`b` = `test`.`parent`.`b`) and (`test`.`child`.`a` = `test`.`parent`.`a`) and (`test`.`parent`.`b` > 5)) alter table child drop primary key; commit; alter table child add primary key(a,b); ============================================================= Drop of EQ_REF'ed child's PRIMARY KEY after executed a while. ============================================================= explain select straight_join count(*) from parent join child on child.a = parent.a and child.b = parent.b where parent.b > 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE parent p0,p1,p2,p3,p4,p5,p6,p7 range PRIMARY,b b 4 NULL ### ### Parent of 2 pushed join@1; Using where with pushed condition (`test`.`parent`.`b` > 5); Using MRR 1 SIMPLE child p0,p1,p2,p3,p4,p5,p6,p7 eq_ref PRIMARY,b PRIMARY 8 test.parent.a,test.parent.b ### ### Child of 'parent' in pushed join@1 Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `count(*)` from `test`.`parent` join `test`.`child` where ((`test`.`child`.`b` = `test`.`parent`.`b`) and (`test`.`child`.`a` = `test`.`parent`.`a`) and (`test`.`parent`.`b` > 5)) alter table child drop primary key; commit; alter table child add primary key(a,b); =========================================================== ONLINE ALTER: Rename table to make it go away - temporarily =========================================================== explain select straight_join count(*) from parent join child on child.a = parent.a and child.b = parent.b where parent.b > 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE parent p0,p1,p2,p3,p4,p5,p6,p7 range PRIMARY,b b 4 NULL ### ### Parent of 2 pushed join@1; Using where with pushed condition (`test`.`parent`.`b` > 5); Using MRR 1 SIMPLE child p0,p1,p2,p3,p4,p5,p6,p7 eq_ref PRIMARY,b PRIMARY 8 test.parent.a,test.parent.b ### ### Child of 'parent' in pushed join@1 Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `count(*)` from `test`.`parent` join `test`.`child` where ((`test`.`child`.`b` = `test`.`parent`.`b`) and (`test`.`child`.`a` = `test`.`parent`.`a`) and (`test`.`parent`.`b` > 5)) alter table child algorithm=inplace, rename to child_orig; commit; alter table child_orig rename to child; ======================================*===================== OFFLINE ALTER: Rename table to make it go away - temporarily ==========================================*================= explain select straight_join count(*) from parent join child on child.a = parent.a and child.b = parent.b where parent.b > 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE parent p0,p1,p2,p3,p4,p5,p6,p7 range PRIMARY,b b 4 NULL ### ### Parent of 2 pushed join@1; Using where with pushed condition (`test`.`parent`.`b` > 5); Using MRR 1 SIMPLE child p0,p1,p2,p3,p4,p5,p6,p7 eq_ref PRIMARY,b PRIMARY 8 test.parent.a,test.parent.b ### ### Child of 'parent' in pushed join@1 Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `count(*)` from `test`.`parent` join `test`.`child` where ((`test`.`child`.`b` = `test`.`parent`.`b`) and (`test`.`child`.`a` = `test`.`parent`.`a`) and (`test`.`parent`.`b` > 5)) alter table child algorithm=copy, rename to child_orig; commit; alter table child_orig rename to child; ================================================================= ONLINE ALTER: drop + recreate table 'child' key b in use by query ================================================================= explain select straight_join count(*) from parent join child on child.b = parent.a where parent.b > 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE parent p0,p1,p2,p3,p4,p5,p6,p7 range PRIMARY,b b 4 NULL ### ### Parent of 2 pushed join@1; Using where with pushed condition (`test`.`parent`.`b` > 5); Using MRR 1 SIMPLE child p0,p1,p2,p3,p4,p5,p6,p7 ref b b 4 test.parent.a ### ### Child of 'parent' in pushed join@1 Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `count(*)` from `test`.`parent` join `test`.`child` where ((`test`.`child`.`b` = `test`.`parent`.`a`) and (`test`.`parent`.`b` > 5)) alter table child algorithm=inplace, drop key b; alter table child add key(b); ================================================================== ONLINE ALTER: drop + recreate table 'parent' key b in use by query ================================================================== explain select straight_join count(*) from parent join child on child.a = parent.a and child.b = parent.b where parent.b > 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE parent p0,p1,p2,p3,p4,p5,p6,p7 range PRIMARY,b b 4 NULL ### ### Parent of 2 pushed join@1; Using where with pushed condition (`test`.`parent`.`b` > 5); Using MRR 1 SIMPLE child p0,p1,p2,p3,p4,p5,p6,p7 eq_ref PRIMARY,b PRIMARY 8 test.parent.a,test.parent.b ### ### Child of 'parent' in pushed join@1 Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `count(*)` from `test`.`parent` join `test`.`child` where ((`test`.`child`.`b` = `test`.`parent`.`b`) and (`test`.`child`.`a` = `test`.`parent`.`a`) and (`test`.`parent`.`b` > 5)) alter table parent algorithm=inplace, drop key b; alter table parent add key(b); =============================================== OFFLINE ALTER: add + drop column c from 'child' =============================================== explain select straight_join count(*) from parent join child on child.a = parent.a and child.b = parent.b where parent.b > 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE parent p0,p1,p2,p3,p4,p5,p6,p7 range PRIMARY,b b 4 NULL ### ### Parent of 2 pushed join@1; Using where with pushed condition (`test`.`parent`.`b` > 5); Using MRR 1 SIMPLE child p0,p1,p2,p3,p4,p5,p6,p7 eq_ref PRIMARY,b PRIMARY 8 test.parent.a,test.parent.b ### ### Child of 'parent' in pushed join@1 Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `count(*)` from `test`.`parent` join `test`.`child` where ((`test`.`child`.`b` = `test`.`parent`.`b`) and (`test`.`child`.`a` = `test`.`parent`.`a`) and (`test`.`parent`.`b` > 5)) alter table child algorithm=copy, add column c int; alter table child drop column c; ========================================================== OFFLINE ALTER: drop + recreate primary key(a,b) for 'child' ========================================================== explain select straight_join count(*) from parent join child on child.a = parent.a where parent.b > 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE parent p0,p1,p2,p3,p4,p5,p6,p7 range PRIMARY,b b 4 NULL ### ### Parent of 2 pushed join@1; Using where with pushed condition (`test`.`parent`.`b` > 5); Using MRR 1 SIMPLE child p0,p1,p2,p3,p4,p5,p6,p7 ref PRIMARY PRIMARY 4 test.parent.a ### ### Child of 'parent' in pushed join@1 Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `count(*)` from `test`.`parent` join `test`.`child` where ((`test`.`child`.`a` = `test`.`parent`.`a`) and (`test`.`parent`.`b` > 5)) alter table child algorithm=copy, drop primary key; alter table child add primary key(a,b); ================== DROP TABLE 'child' ================== explain select straight_join count(*) from parent join child on child.a = parent.a and child.b = parent.b where parent.b > 5; id select_type table partitions type possible_keys key key_len ref rows filtered Extra 1 SIMPLE parent p0,p1,p2,p3,p4,p5,p6,p7 range PRIMARY,b b 4 NULL ### ### Parent of 2 pushed join@1; Using where with pushed condition (`test`.`parent`.`b` > 5); Using MRR 1 SIMPLE child p0,p1,p2,p3,p4,p5,p6,p7 eq_ref PRIMARY,b PRIMARY 8 test.parent.a,test.parent.b ### ### Child of 'parent' in pushed join@1 Warnings: Note 1003 /* select#1 */ select straight_join count(0) AS `count(*)` from `test`.`parent` join `test`.`child` where ((`test`.`child`.`b` = `test`.`parent`.`b`) and (`test`.`child`.`a` = `test`.`parent`.`a`) and (`test`.`parent`.`b` > 5)) drop table child; =========== Cleaning up =========== drop table if exists parent;