Shiva Jahangiri created ASTERIXDB-2788:
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Summary: Plan's stages do not create correct stages for bushy
plans in compile time
Key: ASTERIXDB-2788
URL: https://issues.apache.org/jira/browse/ASTERIXDB-2788
Project: Apache AsterixDB
Issue Type: Bug
Reporter: Shiva Jahangiri
PlanStagesGenerator generates "pipelines" instead of stages and as such for
calculating the maximum required memory it calculates the memory needed for
largest pipeline not the largest stage. It does not impact the linear plans,
but for bushy plans, the independent pipelines (independent builds) that can be
co-scheduled should get merged into one stage. In this case, merging some small
pipelines can make a larger stage than what was considered to be the largest
stage in the past (which is the largest pipeline).
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