Quanlong Huang created IMPALA-15690:
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Summary: HBO for computing SubplanNode cardinality
Key: IMPALA-15690
URL: https://issues.apache.org/jira/browse/IMPALA-15690
Project: IMPALA
Issue Type: Improvement
Components: Frontend
Reporter: Quanlong Huang
Assignee: Quanlong Huang
SubplanNode is used to unnest collection (array/map) items with some (optional)
operators like agg/analytic/sort, etc.
This tracks the work for HBO to read/write cardinality of the top-level
SubplanNodes.
Note that the #Rows values shown in ExecSummary of nodes in a SubplanNode's
right subtree are incomplete, they just count for the last iteration (for the
last row being unnested). So we just track the top-level SubplanNode and that's
enough for the whole query plan.
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