26 lines
910 B
MySQL
26 lines
910 B
MySQL
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-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
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-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
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-- TODO: not working yet
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-- LEADING hint sets the order properly but not the ORDERED hint
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drop table t1;
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drop table t2;
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create table t1 as select * from all_objects;
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create table t2 as select * from all_objects;
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create index i1 on t2(object_id);
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exec dbms_stats.gather_table_stats(user,'T1');
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exec dbms_stats.gather_table_stats(user,'T2');
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-- ordered hint "ignored" starting from 11.2.0.1 thanks to distinct aggregation transformation
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select /*+ ORDERED */ t1.owner, count(distinct t2.object_type) from t2, t1 where t1.object_id = t2.object_id group by t1.owner;
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@x
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select /*+ ORDERED NO_TRANSFORM_DISTINCT_AGG */ t1.owner, count(distinct t2.object_type) from t2, t1 where t1.object_id = t2.object_id group by t1.owner;
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@x
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