[jira] [Created] (IMPALA-12847) Make computeScanRangeLocations and computeStats idempotent in HdfsScanNode.java

["Riza Suminto (Jira)" <ji...@apache.org>]

Riza Suminto created IMPALA-12847:
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             Summary: Make computeScanRangeLocations and computeStats idempotent in HdfsScanNode.java
                 Key: IMPALA-12847
                 URL: https://issues.apache.org/jira/browse/IMPALA-12847
             Project: IMPALA
          Issue Type: Improvement
          Components: Frontend
            Reporter: Riza Suminto
            Assignee: Riza Suminto


After IMPALA-12631, HdfsScanNode.computeScanRangeLocations() need check if countStarSlot_ is null or not to schedule footer range only. HdfsScanNode.computeScanRangeLocations() is called along with HdfsScanNode.init() call.

An external frontend that has its own count star slot analysis and initialization will need to recompute scan range assignment and stats after HdfsScanNode.init(). Therefore, computeScanRangeLocations() and computeStats() should be made idempotent after init() and exposed to subclasses.



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