135 lines
3.5 KiB
SQL
135 lines
3.5 KiB
SQL
####################
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# Part 1
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#
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# Expect to rewrite
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####################
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## case 1 ##
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## expect to rewrite to peel of the top-level stmt
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select * from (select * from t1 order by c2) a limit 1;
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select * from t1 order by c2 limit 1;
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## case 2 ##
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## with limit + offset
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select * from (select * from t1 order by c2) a limit 1, 10;
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select * from t1 order by c2 limit 1, 10;
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## case 3 ##
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## with desc
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select * from (select * from t1 order by c2 desc) a limit 1, 10;
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select * from t1 order by c2 limit 1, 10;
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## case 4 ##
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## with no-column predicate
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select * from (select * from t1 order by c2 desc) a where 1=1 limit 1, 10;
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select * from t1 order by c2 limit 1, 10;
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## case 5 ##
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## with no-column predicate
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select * from (select * from t1 order by c2 desc) a where (1=1) and (0=0) limit 1, 10;
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select * from t1 order by c2 limit 1, 10;
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## case 6 ##
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## with no-column predicate
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select * from (select * from t1 order by c2 desc) a where 1 limit 1, 10;
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select * from t1 order by c2 limit 1, 10;
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## case 7 ##
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## muiltiple-level
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select * from (select * from (select * from (select * from (select * from (select * from (select * from t1 order by c2) a) b) c) d) e) f limit 1;
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## case 8 ##
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## muiltiple-level, with some alias table names in select list
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select * from (select * from (select d.* from (select c.* from (select * from (select * from (select * from t1 order by c2) a) b) c) d) e) f limit 1;
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###########################
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# Part 1
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#
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# Expect NOT to rewrite
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###########################
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## case 1 ##
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# with top-level order-by, no rewrite
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select * from (select * from t1) a order by a.c2 limit 1, 10;
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select * from t1 order by c2 limit 1, 10;
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## case 2 ##
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# with top-level group-by, no rewrite
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select count(*) from (select * from t1) a group by a.c2 limit 1, 10;
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## case 3 ##
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# non-star select, no rewrite
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select a.c1 from (select * from t1) a group by a.c2 limit 1, 10;
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## case 4 ##
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# no top-level limit, no rewrite
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select a.c2 from (select * from t1) a;
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## case 5 ##
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# more than 1 table, no rewrite
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select * from (select * from t1) a, t1 where a.c2 = t1.c2 limit 10;
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## case 6 ##
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# column-related predicates, no rewrite
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select * from (select * from t1) a where a.c2 = 1 limit 1;
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## case 7 ##
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# with distinct, no rewrite
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select distinct a.c1 from (select * from t1) a limit 1;
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## case 8 ##
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# not top-level, no rewrite
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select b.c2 from (select * from (select * from t1) a limit 10) b;
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## case 9 ##
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# subquery in set, no rewrite
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(select * from (select * from t1) a limit 10) union all (select * from (select * from t1) b limit 10);
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## case 10 ##
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# subquery in condition, no rewrite
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select * from (select * from t1 order by c2) a where exists (select * from t1) limit 10;
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#has other functions, so no write
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select now(), b.* from (select c2 from t1 group by c2) as b;
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select * from tl0 union distinct select * from tr0;
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select * from tl0 union distinct select * from tr1;
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select * from tl0 union distinct select * from tr2;
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select * from tl0 union distinct select * from tr3;
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select * from tl1 union distinct select * from tr0;
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select * from tl1 union distinct select * from tr1;
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select * from tl1 union distinct select * from tr2;
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select * from tl1 union distinct select * from tr3;
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select * from tl2 union distinct select * from tr0;
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select * from tl2 union distinct select * from tr1;
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select * from tl2 union distinct select * from tr2;
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select * from tl2 union distinct select * from tr3;
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select * from tl3 union distinct select * from tr0;
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select * from tl3 union distinct select * from tr1;
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select * from tl3 union distinct select * from tr2;
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select * from tl3 union distinct select * from tr3;
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