Aleksey Plekhanov created IGNITE-18390:
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Summary: Calcite engine. Reduce count of created spools during
planning
Key: IGNITE-18390
URL: https://issues.apache.org/jira/browse/IGNITE-18390
Project: Ignite
Issue Type: Improvement
Reporter: Aleksey Plekhanov
Assignee: Aleksey Plekhanov
Currently, when trying to convert traits table spool is created for each
exchange node, but not always required. Root node not required to be
rewindable, rewindability is required only on the right hand of correlated
nested loop node, but rewindability trait is propagated from the bottom nodes
(table and index scans) to the top nodes and all nodes are converted to
rewindable, this cause redundant spool creation.
Investigate posibility to reduce count of table spools to reduce planning time.
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