[jira] [Created] (IGNITE-17889) Calcite engine. Avoid full index scans in case of null dynamic parameter

["Aleksey Plekhanov (Jira)" <ji...@apache.org>]

Aleksey Plekhanov created IGNITE-17889:
------------------------------------------

             Summary: Calcite engine. Avoid full index scans in case of null dynamic parameter
                 Key: IGNITE-17889
                 URL: https://issues.apache.org/jira/browse/IGNITE-17889
             Project: Ignite
          Issue Type: Improvement
            Reporter: Aleksey Plekhanov


Currently, queries like:
{code:java}
SELECT * FROM tbl WHERE a >= ?
{code}
Should return no rows if dynamic parameter is null, but can be downgraded to full index scan in case table have index on column {{a}} (ASCENDING order, NULLS FIRST).

We should somehow analyse nulls in search bounds and return empty rows iterator for regular field conditions (`=`, `<`, '>`, etc). But also nulls should be processed as is in search bounds for conditions like `IS NULL`, `IS NOT NULL`, `IS NOT DISTINCT FROM` (the last one not supported currently).  



--
This message was sent by Atlassian Jira
(v8.20.10#820010)