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Posted to issues@ignite.apache.org by "Yury Gerzhedovich (Jira)" <ji...@apache.org> on 2023/02/23 12:41:00 UTC

[jira] [Created] (IGNITE-18890) Sql. Avoid full index scans in case of null dynamic parameter

Yury Gerzhedovich created IGNITE-18890:
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             Summary: Sql. Avoid full index scans in case of null dynamic parameter
                 Key: IGNITE-18890
                 URL: https://issues.apache.org/jira/browse/IGNITE-18890
             Project: Ignite
          Issue Type: Improvement
          Components: sql
            Reporter: Yury Gerzhedovich


The ticket is a copy of IGNITE-17889 to port it from AI2 to AI3.


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).  



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