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

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

     [ https://issues.apache.org/jira/browse/IGNITE-17889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksey Plekhanov reassigned IGNITE-17889:
------------------------------------------

    Assignee: Aleksey Plekhanov

> 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
>            Assignee: Aleksey Plekhanov
>            Priority: Major
>              Labels: calcite, calcite2-required, calcite3-required
>
> 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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