Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/21077 )

Change subject: IMPALA-12847: Expose computeScanRangeLocations and computeStats
......................................................................

IMPALA-12847: Expose computeScanRangeLocations and computeStats

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.

This patch decouple countStarSlot_ initialization from
computeScanRangeLocations() and raise access level of
computeScanRangeLocations() from private to protected.

Testing:
- Pass core tests.

Change-Id: Ia621309c67455bb599f71bec9efc1f67fc085022
Reviewed-on: http://gerrit.cloudera.org:8080/21077
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
---
M fe/src/main/java/org/apache/impala/planner/HdfsScanNode.java
1 file changed, 84 insertions(+), 50 deletions(-)

Approvals:
  Impala Public Jenkins: Looks good to me, approved; Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Ia621309c67455bb599f71bec9efc1f67fc085022
Gerrit-Change-Number: 21077
Gerrit-PatchSet: 5
Gerrit-Owner: Riza Suminto <[email protected]>
Gerrit-Reviewer: Aman Sinha <[email protected]>
Gerrit-Reviewer: Fang-Yu Rao <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Riza Suminto <[email protected]>

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