-- source include/have_innodb.inc

--disable_warnings
drop table if exists prefixinno;
--enable_warnings

set global innodb_prefix_index_cluster_optimization = ON;
show variables like 'innodb_prefix_index_cluster_optimization';

--echo # Create a table with a large varchar field that we index the prefix
--echo # of and ensure we only trigger cluster lookups when we expect it.
create table prefixinno (
       id int not null,
       fake_id int not null,
       bigfield varchar(4096),
       primary key(id),
       index bigfield_idx (bigfield(32)),
       index fake_id_bigfield_prefix (fake_id, bigfield(32))
) engine=innodb;

insert into prefixinno values (1, 1001, repeat('a', 1)),
                              (8, 1008, repeat('b', 8)),
                              (24, 1024, repeat('c', 24)),
                              (31, 1031, repeat('d', 31)),
                              (32, 1032, repeat('x', 32)),
                              (33, 1033, repeat('y', 33)),
                              (128, 1128, repeat('z', 128));

select * from prefixinno;

let $show_count_statement = show status like 'innodb_secondary_index_triggered_cluster_reads';
let $show_opt_statement = show status like 'innodb_secondary_index_triggered_cluster_reads_avoided';

--disable_query_log

--echo # Baseline sanity check: 0, 0.
--let $base_count = query_get_value($show_count_statement, Value, 1)
--let $base_opt = query_get_value($show_opt_statement, Value, 1)
select "no-op query";
--let $count = query_get_value($show_count_statement, Value, 1)
eval select $count - $base_count into @cluster_lookups;
select @cluster_lookups = 0 as cluster_lookups_matched;
--let $opt = query_get_value($show_opt_statement, Value, 1)
eval select $opt - $base_opt into @cluster_lookups;
select @cluster_lookups = 0 as cluster_lookups_avoided_matched;

--echo # Eligible for optimization.
--let $base_count = query_get_value($show_count_statement, Value, 1)
--let $base_opt = query_get_value($show_opt_statement, Value, 1)
select id, bigfield from prefixinno where bigfield = repeat('d', 31);
--let $count = query_get_value($show_count_statement, Value, 1)
eval select $count - $base_count into @cluster_lookups;
select @cluster_lookups = 0 as cluster_lookups_matched;
--let $opt = query_get_value($show_opt_statement, Value, 1)
eval select $opt - $base_opt into @cluster_lookups;
select @cluster_lookups = 1 as cluster_lookups_avoided_matched;

--echo # Eligible for optimization, access via fake_id only.
--let $base_count = query_get_value($show_count_statement, Value, 1)
--let $base_opt = query_get_value($show_opt_statement, Value, 1)
select id, bigfield from prefixinno where fake_id = 1031;
--let $count = query_get_value($show_count_statement, Value, 1)
eval select $count - $base_count into @cluster_lookups;
select @cluster_lookups = 0 as cluster_lookups_matched;
--let $opt = query_get_value($show_opt_statement, Value, 1)
eval select $opt - $base_opt into @cluster_lookups;
select @cluster_lookups = 1 as cluster_lookups_avoided_matched;

--echo # Not eligible for optimization, access via fake_id of big row.
--let $base_count = query_get_value($show_count_statement, Value, 1)
--let $base_opt = query_get_value($show_opt_statement, Value, 1)
select id, bigfield from prefixinno where fake_id = 1033;
--let $count = query_get_value($show_count_statement, Value, 1)
eval select $count - $base_count into @cluster_lookups;
select @cluster_lookups = 1 as cluster_lookups_matched;
--let $opt = query_get_value($show_opt_statement, Value, 1)
eval select $opt - $base_opt into @cluster_lookups;
select @cluster_lookups = 0 as cluster_lookups_avoided_matched;

--echo # Not eligible for optimization.
--let $base_count = query_get_value($show_count_statement, Value, 1)
--let $base_opt = query_get_value($show_opt_statement, Value, 1)
select id, bigfield from prefixinno where bigfield = repeat('x', 32);
--let $count = query_get_value($show_count_statement, Value, 1)
eval select $count - $base_count into @cluster_lookups;
select @cluster_lookups = 1 as cluster_lookups_matched;
--let $opt = query_get_value($show_opt_statement, Value, 1)
eval select $opt - $base_opt into @cluster_lookups;
select @cluster_lookups = 0 as cluster_lookups_avoided_matched;

--echo # Not eligible for optimization.
--let $base_count = query_get_value($show_count_statement, Value, 1)
--let $base_opt = query_get_value($show_opt_statement, Value, 1)
select id, bigfield from prefixinno where bigfield = repeat('y', 33);
--let $count = query_get_value($show_count_statement, Value, 1)
eval select $count - $base_count into @cluster_lookups;
select @cluster_lookups = 1 as cluster_lookups_matched;
--let $opt = query_get_value($show_opt_statement, Value, 1)
eval select $opt - $base_opt into @cluster_lookups;
select @cluster_lookups = 0 as cluster_lookups_avoided_matched;

--echo # Eligible, should not increment lookup counter.
--let $base_count = query_get_value($show_count_statement, Value, 1)
--let $base_opt = query_get_value($show_opt_statement, Value, 1)
select id, bigfield from prefixinno where bigfield = repeat('b', 8);
--let $count = query_get_value($show_count_statement, Value, 1)
eval select $count - $base_count into @cluster_lookups;
select @cluster_lookups = 0 as cluster_lookups_matched;
--let $opt = query_get_value($show_opt_statement, Value, 1)
eval select $opt - $base_opt into @cluster_lookups;
select @cluster_lookups = 1 as cluster_lookups_avoided_matched;

--echo # Eligible, should not increment lookup counter.
--let $base_count = query_get_value($show_count_statement, Value, 1)
--let $base_opt = query_get_value($show_opt_statement, Value, 1)
select id, bigfield from prefixinno where bigfield = repeat('c', 24);
--let $count = query_get_value($show_count_statement, Value, 1)
eval select $count - $base_count into @cluster_lookups;
select @cluster_lookups = 0 as cluster_lookups_matched;
--let $opt = query_get_value($show_opt_statement, Value, 1)
eval select $opt - $base_opt into @cluster_lookups;
select @cluster_lookups = 1 as cluster_lookups_avoided_matched;

--echo # Should increment lookup counter.
--let $base_count = query_get_value($show_count_statement, Value, 1)
--let $base_opt = query_get_value($show_opt_statement, Value, 1)
select id, bigfield from prefixinno where bigfield = repeat('z', 128);
--let $count = query_get_value($show_count_statement, Value, 1)
eval select $count - $base_count into @cluster_lookups;
select @cluster_lookups = 1 as cluster_lookups_matched;
--let $opt = query_get_value($show_opt_statement, Value, 1)
eval select $opt - $base_opt into @cluster_lookups;
select @cluster_lookups = 0 as cluster_lookups_avoided_matched;

--echo # Disable optimization, confirm we still increment counter.
--let $base_count = query_get_value($show_count_statement, Value, 1)
--let $base_opt = query_get_value($show_opt_statement, Value, 1)
set global innodb_prefix_index_cluster_optimization = OFF;
select id, bigfield from prefixinno where fake_id = 1033;
--let $count = query_get_value($show_count_statement, Value, 1)
eval select $count - $base_count into @cluster_lookups;
select @cluster_lookups = 1 as cluster_lookups_matched;
--let $opt = query_get_value($show_opt_statement, Value, 1)
eval select $opt - $base_opt into @cluster_lookups;
select @cluster_lookups = 0 as cluster_lookups_avoided_matched;


--echo # make test suite happy by cleaning up our mess
drop table prefixinno;
set global innodb_prefix_index_cluster_optimization = OFF;