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MDEV-12255 innodb_prefix_index_cluster_optimization hits debug build
assert on UTF-8 columns
Problem:
=======
(1) Multi-byte character cases are not considered during prefix index
cluster optimization check. It leads to fetch of improper results during
read operation.
(2) Strict assert in row_sel_field_store_in_mysql_format_func and it asserts
for prefix index record to mysql conversion.
Solution:
========
(1) Consider the case of multi-byte character during prefix index
cluster optimization check.
(2) Relax the assert in row_sel_field_store_in_mysql_format_func to allow
prefix index record to mysql format conversion.
The patch is taken from
1eee538087
This commit is contained in:
Thirunarayanan Balathandayuthapani
@ -31,120 +31,638 @@ select * from prefixinno;
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let $show_count_statement = show status like 'innodb_secondary_index_triggered_cluster_reads';
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let $show_opt_statement = show status like 'innodb_secondary_index_triggered_cluster_reads_avoided';
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--disable_query_log
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--echo # Baseline sanity check: 0, 0.
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--let $base_count = query_get_value($show_count_statement, Value, 1)
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--let $base_opt = query_get_value($show_opt_statement, Value, 1)
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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select "no-op query";
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--let $count = query_get_value($show_count_statement, Value, 1)
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval select $count - $base_count into @cluster_lookups;
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select @cluster_lookups = 0 as cluster_lookups_matched;
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--let $opt = query_get_value($show_opt_statement, Value, 1)
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eval select $opt - $base_opt into @cluster_lookups;
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select @cluster_lookups = 0 as cluster_lookups_avoided_matched;
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eval select $opt - $base_opt into @cluster_lookups_avoided;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Eligible for optimization.
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--let $base_count = query_get_value($show_count_statement, Value, 1)
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--let $base_opt = query_get_value($show_opt_statement, Value, 1)
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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select id, bigfield from prefixinno where bigfield = repeat('d', 31);
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--let $count = query_get_value($show_count_statement, Value, 1)
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval select $count - $base_count into @cluster_lookups;
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select @cluster_lookups = 0 as cluster_lookups_matched;
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--let $opt = query_get_value($show_opt_statement, Value, 1)
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eval select $opt - $base_opt into @cluster_lookups;
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select @cluster_lookups = 1 as cluster_lookups_avoided_matched;
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eval select $opt - $base_opt into @cluster_lookups_avoided;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Eligible for optimization, access via fake_id only.
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--let $base_count = query_get_value($show_count_statement, Value, 1)
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--let $base_opt = query_get_value($show_opt_statement, Value, 1)
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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select id, bigfield from prefixinno where fake_id = 1031;
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--let $count = query_get_value($show_count_statement, Value, 1)
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval select $count - $base_count into @cluster_lookups;
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select @cluster_lookups = 0 as cluster_lookups_matched;
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--let $opt = query_get_value($show_opt_statement, Value, 1)
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eval select $opt - $base_opt into @cluster_lookups;
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select @cluster_lookups = 1 as cluster_lookups_avoided_matched;
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eval select $opt - $base_opt into @cluster_lookups_avoided;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Not eligible for optimization, access via fake_id of big row.
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--let $base_count = query_get_value($show_count_statement, Value, 1)
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--let $base_opt = query_get_value($show_opt_statement, Value, 1)
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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select id, bigfield from prefixinno where fake_id = 1033;
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--let $count = query_get_value($show_count_statement, Value, 1)
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval select $count - $base_count into @cluster_lookups;
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select @cluster_lookups = 1 as cluster_lookups_matched;
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--let $opt = query_get_value($show_opt_statement, Value, 1)
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eval select $opt - $base_opt into @cluster_lookups;
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select @cluster_lookups = 0 as cluster_lookups_avoided_matched;
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eval select $opt - $base_opt into @cluster_lookups_avoided;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Not eligible for optimization.
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--let $base_count = query_get_value($show_count_statement, Value, 1)
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--let $base_opt = query_get_value($show_opt_statement, Value, 1)
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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select id, bigfield from prefixinno where bigfield = repeat('x', 32);
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--let $count = query_get_value($show_count_statement, Value, 1)
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval select $count - $base_count into @cluster_lookups;
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select @cluster_lookups = 1 as cluster_lookups_matched;
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--let $opt = query_get_value($show_opt_statement, Value, 1)
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eval select $opt - $base_opt into @cluster_lookups;
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select @cluster_lookups = 0 as cluster_lookups_avoided_matched;
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eval select $opt - $base_opt into @cluster_lookups_avoided;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Not eligible for optimization.
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--let $base_count = query_get_value($show_count_statement, Value, 1)
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--let $base_opt = query_get_value($show_opt_statement, Value, 1)
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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select id, bigfield from prefixinno where bigfield = repeat('y', 33);
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--let $count = query_get_value($show_count_statement, Value, 1)
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval select $count - $base_count into @cluster_lookups;
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select @cluster_lookups = 1 as cluster_lookups_matched;
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--let $opt = query_get_value($show_opt_statement, Value, 1)
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eval select $opt - $base_opt into @cluster_lookups;
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select @cluster_lookups = 0 as cluster_lookups_avoided_matched;
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eval select $opt - $base_opt into @cluster_lookups_avoided;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Eligible, should not increment lookup counter.
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--let $base_count = query_get_value($show_count_statement, Value, 1)
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--let $base_opt = query_get_value($show_opt_statement, Value, 1)
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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select id, bigfield from prefixinno where bigfield = repeat('b', 8);
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--let $count = query_get_value($show_count_statement, Value, 1)
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval select $count - $base_count into @cluster_lookups;
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select @cluster_lookups = 0 as cluster_lookups_matched;
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--let $opt = query_get_value($show_opt_statement, Value, 1)
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eval select $opt - $base_opt into @cluster_lookups;
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select @cluster_lookups = 1 as cluster_lookups_avoided_matched;
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eval select $opt - $base_opt into @cluster_lookups_avoided;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Eligible, should not increment lookup counter.
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--let $base_count = query_get_value($show_count_statement, Value, 1)
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--let $base_opt = query_get_value($show_opt_statement, Value, 1)
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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select id, bigfield from prefixinno where bigfield = repeat('c', 24);
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--let $count = query_get_value($show_count_statement, Value, 1)
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval select $count - $base_count into @cluster_lookups;
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select @cluster_lookups = 0 as cluster_lookups_matched;
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--let $opt = query_get_value($show_opt_statement, Value, 1)
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eval select $opt - $base_opt into @cluster_lookups;
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select @cluster_lookups = 1 as cluster_lookups_avoided_matched;
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eval select $opt - $base_opt into @cluster_lookups_avoided;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Should increment lookup counter.
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--let $base_count = query_get_value($show_count_statement, Value, 1)
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--let $base_opt = query_get_value($show_opt_statement, Value, 1)
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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select id, bigfield from prefixinno where bigfield = repeat('z', 128);
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--let $count = query_get_value($show_count_statement, Value, 1)
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval select $count - $base_count into @cluster_lookups;
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select @cluster_lookups = 1 as cluster_lookups_matched;
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--let $opt = query_get_value($show_opt_statement, Value, 1)
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eval select $opt - $base_opt into @cluster_lookups;
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select @cluster_lookups = 0 as cluster_lookups_avoided_matched;
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eval select $opt - $base_opt into @cluster_lookups_avoided;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Disable optimization, confirm we still increment counter.
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--let $base_count = query_get_value($show_count_statement, Value, 1)
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--let $base_opt = query_get_value($show_opt_statement, Value, 1)
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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set global innodb_prefix_index_cluster_optimization = OFF;
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select id, bigfield from prefixinno where fake_id = 1033;
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--let $count = query_get_value($show_count_statement, Value, 1)
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval select $count - $base_count into @cluster_lookups;
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select @cluster_lookups = 1 as cluster_lookups_matched;
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--let $opt = query_get_value($show_opt_statement, Value, 1)
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eval select $opt - $base_opt into @cluster_lookups;
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select @cluster_lookups = 0 as cluster_lookups_avoided_matched;
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eval select $opt - $base_opt into @cluster_lookups_avoided;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # make test suite happy by cleaning up our mess
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drop table prefixinno;
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--echo # Multi-byte handling case
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set global innodb_prefix_index_cluster_optimization = ON;
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SET NAMES utf8mb4;
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CREATE TABLE t1(
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f1 varchar(10) CHARACTER SET UTF8MB4 COLLATE UTF8MB4_BIN,
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INDEX (f1(3)))ENGINE=INNODB;
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INSERT INTO t1 VALUES('a'), ('cccc'), ('až'), ('cčc'), ('ggᵷg'), ('¢¢');
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INSERT INTO t1 VALUES('தமிழ்'), ('🐱🌑'), ('🌒'), ('🌑');
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INSERT INTO t1 VALUES('😊me'), ('eu€'), ('ls¢');
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--echo # Eligible - record length is shorter than prefix
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'a';
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval set @cluster_lookups = $count - $base_count;
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eval set @cluster_lookups_avoided = $opt - $base_opt;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Not eligible - record length longer than prefix length
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like 'c%';
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval set @cluster_lookups = $count - $base_count;
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eval set @cluster_lookups_avoided = $opt - $base_opt;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Eligible - record length shorter than prefix length
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'až';
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval set @cluster_lookups = $count - $base_count;
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eval set @cluster_lookups_avoided = $opt - $base_opt;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Not eligible - record length longer than prefix length
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'தமிழ்';
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval set @cluster_lookups = $count - $base_count;
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eval set @cluster_lookups_avoided = $opt - $base_opt;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Not eligible - record length longer than prefix length
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like 'ggᵷ%';
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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--disable_query_log
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eval set @cluster_lookups = $count - $base_count;
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eval set @cluster_lookups_avoided = $opt - $base_opt;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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--echo # Not eligible - record length longer than prefix length
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||||
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let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '😊%';
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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||||
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||||
--disable_query_log
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eval set @cluster_lookups = $count - $base_count;
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eval set @cluster_lookups_avoided = $opt - $base_opt;
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--enable_query_log
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select @cluster_lookups;
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select @cluster_lookups_avoided;
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||||
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||||
--echo # Not eligible - record length longer than prefix length
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||||
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||||
let $base_count = query_get_value($show_count_statement, Value, 1);
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let $base_opt = query_get_value($show_opt_statement, Value, 1);
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||||
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SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'ls¢';
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let $count = query_get_value($show_count_statement, Value, 1);
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let $opt = query_get_value($show_opt_statement, Value, 1);
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||||
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||||
--disable_query_log
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||||
eval set @cluster_lookups = $count - $base_count;
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eval set @cluster_lookups_avoided = $opt - $base_opt;
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||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Eligible - record length shorter than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '¢¢%';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Eligible - record length shorter than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🐱🌑%';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Not eligible - record length longer than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🌑%';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Not eligible - record length longer than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🌒%';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
DROP TABLE t1;
|
||||
|
||||
--echo # Multi-byte with minimum character length > 1 bytes
|
||||
|
||||
CREATE TABLE t1(
|
||||
f1 varchar(10) CHARACTER SET UTF16 COLLATE UTF16_BIN,
|
||||
INDEX (f1(3)))ENGINE=INNODB;
|
||||
|
||||
INSERT INTO t1 VALUES('a'), ('cccc'), ('až'), ('cčc'), ('ggᵷg'), ('¢¢');
|
||||
INSERT INTO t1 VALUES('தமிழ்'), ('🐱🌑'), ('🌒'), ('🌑');
|
||||
INSERT INTO t1 VALUES('😊me'), ('eu€'), ('ls¢');
|
||||
|
||||
--echo # Eligible - record length is shorter than prefix
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'a';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Not eligible - record length longer than prefix length
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like 'c%';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Eligible - record length shorter than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'až';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Not eligible - record length longer than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'தமிழ்';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Not eligible - record length longer than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like 'ggᵷ%';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Not eligible - record length longer than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '😊%';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Not eligible - record length longer than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 = 'ls¢';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Eligible - record length shorter than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX(`f1`) WHERE f1 like '¢¢%';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Eligible - record length shorter than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🐱🌑%';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Eligible - record length is shorter than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🌑%';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Eligible - record length is shorter than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT f1 FROM t1 FORCE INDEX (`f1`) WHERE f1 like '🌒%';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
DROP TABLE t1;
|
||||
|
||||
CREATE TABLE t1(
|
||||
col1 INT,
|
||||
col2 BLOB DEFAULT NULL,
|
||||
INDEX `idx1`(col2(4), col1))ENGINE=INNODB;
|
||||
INSERT INTO t1 VALUES (2, 'test'), (3, repeat('test1', 2000));
|
||||
INSERT INTO t1(col1) VALUES(1);
|
||||
|
||||
--echo # Eligible - record length is shorter than prefix length
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT col1 FROM t1 FORCE INDEX (`idx1`) WHERE col2 is NULL;
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
--echo # Not eligible - record length longer than prefix index
|
||||
|
||||
let $base_count = query_get_value($show_count_statement, Value, 1);
|
||||
let $base_opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
SELECT col1 FROM t1 FORCE INDEX (`idx1`) WHERE col2 like 'test1%';
|
||||
|
||||
let $count = query_get_value($show_count_statement, Value, 1);
|
||||
let $opt = query_get_value($show_opt_statement, Value, 1);
|
||||
|
||||
--disable_query_log
|
||||
eval set @cluster_lookups = $count - $base_count;
|
||||
eval set @cluster_lookups_avoided = $opt - $base_opt;
|
||||
--enable_query_log
|
||||
|
||||
select @cluster_lookups;
|
||||
select @cluster_lookups_avoided;
|
||||
|
||||
DROP TABLE t1;
|
||||
set global innodb_prefix_index_cluster_optimization = OFF;
|
||||
|
||||
Reference in New Issue
Block a user