create table t1 (a int, b int); insert into t1 values (1,2), (4,6), (9,7), (1,1), (2,5), (7,8); create table t2 (a int, b int, c int); insert into t2 values (1,2,3), (5,1,2), (4,3,7), (8,9,0), (10,7,1), (5,5,1); create table t3 (a int, b varchar(16), index idx(a)); insert into t3 values (1, "abc"), (3, "egh"), (8, "axxx"), (10, "abc"), (2, "ccw"), (8, "wqqe"), (7, "au"), (9, "waa"), (3, "rass"), (9, "ert"), (9, "lok"), (8, "aww"), (1, "todd"), (3, "rew"), (8, "aww"), (3, "sw"), (11, "llk"), (7, "rbw"), (1, "sm"), (2, "jyp"), (4, "yq"), (5, "pled"), (12, "ligin"), (12, "toww"), (6, "mxm"), (15, "wanone"), (9, "sunqq"), (2, "abe"); --echo # optimization is not used let $query= select * from t1 where a in (1,2); eval $query; eval explain extended $query; --echo # set minimum number of values in VALUEs list when optimization works to 2 set @@in_subquery_conversion_threshold= 2; --echo # single IN-predicate in WHERE-part let $query= select * from t1 where a in (1,2); let $optimized_query= select * from t1 where a in ( select * from (values (1),(2)) as tvc_0 ); eval $query; eval $optimized_query; eval explain extended $query; eval explain extended $optimized_query; --echo # AND-condition with IN-predicates in WHERE-part let $query= select * from t1 where a in (1,2) and b in (1,5); let $optimized_query= select * from t1 where a in ( select * from (values (1),(2)) as tvc_0 ) and b in ( select * from (values (1),(5)) as tvc_1 ); eval $query; eval $optimized_query; eval explain extended $query; eval explain extended $optimized_query; --echo # subquery with IN-predicate let $query= select * from t1 where a in ( select a from t2 where b in (3,4) ); let $optimized_query= select * from t1 where a in ( select a from t2 where b in ( select * from (values (3),(4)) as tvc_0 ) ); eval $query; eval $optimized_query; eval explain extended $query; eval explain extended $optimized_query; --echo # derived table with IN-predicate let $query= select * from ( select * from t1 where a in (1,2) ) as dr_table; let $optimized_query= select * from ( select * from t1 where a in ( select * from (values (1),(2)) as tvc_0 ) ) as dr_table; eval $query; eval $optimized_query; eval explain extended $query; eval explain extended $optimized_query; --echo # non-recursive CTE with IN-predicate let $cte_query= with tvc_0 as ( select * from t1 where a in (1,2) ) select * from tvc_0; eval $cte_query; eval $optimized_query; eval explain extended $cte_query; eval explain extended $optimized_query; --echo # VIEW with IN-predicate create view v1 as select * from t1 where a in (1,2); create view v2 as select * from t1 where a in ( select * from (values (1),(2)) as tvc_0 ) ; let $query= select * from v1; let $optimized_query= select * from v2; eval $query; eval $optimized_query; eval explain extended $query; eval explain extended $optimized_query; drop view v1,v2; --echo # subselect defined by derived table with IN-predicate let $query= select * from t1 where a in ( select 1 from ( select * from t1 where a in (1,2) ) as dr_table ); let $optimized_query= select * from t1 where a in ( select 1 from ( select * from t1 where a in ( select * from (values (1),(2)) as tvc_0 ) ) as dr_table ); eval $query; eval $optimized_query; eval explain extended $query; eval explain extended $optimized_query; --echo # derived table with IN-predicate and group by let $query= select * from ( select max(a),b from t1 where b in (3,5) group by b ) as dr_table; let $optimized_query= select * from ( select max(a),b from t1 where b in ( select * from (values (3),(5)) as tvc_0 ) group by b ) as dr_table; eval $query; eval $optimized_query; eval explain extended $query; eval explain extended $optimized_query; --echo # prepare statement prepare stmt from "select * from t1 where a in (1,2)"; execute stmt; execute stmt; deallocate prepare stmt; --echo # use inside out access from tvc rows let $query= select * from t3 where a in (1,4,10); set @@in_subquery_conversion_threshold= default; eval $query; eval explain extended $query; set @@in_subquery_conversion_threshold= 2; eval $query; eval explain extended $query; --echo # use vectors in IN predeicate set @@in_subquery_conversion_threshold= 4; let $query= select * from t1 where (a,b) in ((1,2),(3,4)); eval $query; eval explain extended $query; set @@in_subquery_conversion_threshold= 2; --echo # trasformation works for the one IN predicate and doesn't work for the other set @@in_subquery_conversion_threshold= 5; let $query= select * from t2 where (a,b) in ((1,2),(8,9)) and (a,c) in ((1,3),(8,0),(5,1)); eval $query; eval explain extended $query; set @@in_subquery_conversion_threshold= 2; --echo # --echo # mdev-14281: conversion of NOT IN predicate into subquery predicate --echo # let $query= select * from t1 where (a,b) not in ((1,2),(8,9), (5,1)); let $optimized_query= select * from t1 where (a,b) not in (select * from (values (1,2),(8,9), (5,1)) as tvc_0); eval $query; eval $optimized_query; eval explain extended $query; eval explain extended $optimized_query; let $query= select * from t1 where b < 7 and (a,b) not in ((1,2),(8,9), (5,1)); eval $query; eval explain extended $query; let $query= select * from t2 where (a,c) not in ((1,2),(8,9), (5,1)); eval $query; eval explain extended $query; drop table t1, t2, t3; set @@in_subquery_conversion_threshold= default;