Suppose I have the following query and a view v1 defined as follows:
Q1: SELECT * FROM Table1 WHERE Table1.col1 = 5 and Table1.col2 LIKE '%abc%';
create view v1 as select * from Table1 where Table1.col1 = 5;
An effective way to execute Q1 would be to re-write it as: select * from v1 where col2 LIKE '%abc%'; provided that the selection predicates are highly selective and also if it is cheaper in execution time of the query.
However I see that postgres does not automatically perform query rewriting using view. I have looked at the plan using explain (analyze) and I see that Q1 is always executed using the base tables unless I explicitly mention the view in the query instead of the base table.
Is there a way to enforce automatic view selection in postgres or is it up to the user to write the query optimally?