Hello all, had an idea of optimizing a query that may work generally. In case a 'column' is indexed, following two alterations could be done I think: A) select ... where column ~ '^Foo' --> Seq Scan into that: select ... where column BETWEEN 'Foo' AND 'FooZ' --> Index Scan of course 'Z' should be the last possible character internally used of the DBMS. That would work as long as there is no in-case-sensitive search being done. another rescribtion: B) select ... where column ~ '^Foo$' --> Seq Scan into that: select ... where column = 'Foo' --> Bitmap Heap Scan That speeds up things, too. That would also apply to 'LIKE' and 'SIMILAR TO' operations, I think. Is there any idea to make the "Query Planner" more intelligent to do these convertions automatically? Anythings speeks against this hack? Regards Uli Habel
