Let's say I have two tables I want to join together. Table a has around 10 millions of rows and it's primary key is x and y. I have created index on field x and y for table a.
Table b has one row and it's primary key is x and y. The primary key for that row in table b has a correspondent row in table a which has the same primary key. When I try to execute this query to join "select a.*,b.* from a inner join b where (a.x=b.x) and (a.y = b.y);", ti takes more than 4 seconds to show only one record. I also examined the plan for that sql and confirmed the index I created is used for this sql. Ideally, if we use hash join it should take less than half a second. -- Sent from: http://apache-ignite-users.70518.x6.nabble.com/
