Aleksey Plekhanov created IGNITE-17889:
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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).
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