Vladimir Ozerov created IGNITE-6296:
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Summary: SQL: Get rid of "collocated" flag
Key: IGNITE-6296
URL: https://issues.apache.org/jira/browse/IGNITE-6296
Project: Ignite
Issue Type: Task
Components: sql
Affects Versions: 2.1
Reporter: Vladimir Ozerov
This flag forces our execution engine to perform aggregations on mapper nodes
rather than on reducer.
First, we already have enough information in runtime to decide whether we can
optimize or not. Second, if query is complex enough, users would have hard time
trying to figure whether query would return correct result or not. We should
never ever return invalid results.
Let's make our engine smarter, so that it is able to determine whether such
grouping is safe or not and then deprecate that flag.
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