Steve Carlin has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/23513 )

Change subject: IMPALA-13695: Calcite planner: fix for ndv with 2 args
......................................................................

IMPALA-13695: Calcite planner: fix for ndv with 2 args

The NDV function was crashing when called with the "scale" arg. This
requires special processing which exists in FunctionCallExpr.

The validation for this is now done in ImpalaNdvFunction
and the special calculation is done within ImpalaAggRel

This also fixes ndv for varchar types. The aggregation call
within CoerceNodes was not differentiating between varchar
and string. A cast to string function is needed in order
to run the ndv function on a varchar column.

Change-Id: I82419f77e043e9975865a042ffb8db75a26931f7
Reviewed-on: http://gerrit.cloudera.org:8080/23513
Reviewed-by: Riza Suminto <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
---
M fe/src/main/java/org/apache/impala/analysis/FunctionCallExpr.java
M 
java/calcite-planner/src/main/java/org/apache/impala/calcite/coercenodes/CoerceNodes.java
M 
java/calcite-planner/src/main/java/org/apache/impala/calcite/operators/ImpalaCustomOperatorTable.java
A 
java/calcite-planner/src/main/java/org/apache/impala/calcite/operators/ImpalaNdvFunction.java
M 
java/calcite-planner/src/main/java/org/apache/impala/calcite/rel/node/ImpalaAggRel.java
M testdata/workloads/functional-query/queries/QueryTest/calcite.test
6 files changed, 122 insertions(+), 7 deletions(-)

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

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I82419f77e043e9975865a042ffb8db75a26931f7
Gerrit-Change-Number: 23513
Gerrit-PatchSet: 6
Gerrit-Owner: Steve Carlin <[email protected]>
Gerrit-Reviewer: Aman Sinha <[email protected]>
Gerrit-Reviewer: Fang-Yu Rao <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Joe McDonnell <[email protected]>
Gerrit-Reviewer: Michael Smith <[email protected]>
Gerrit-Reviewer: Riza Suminto <[email protected]>
Gerrit-Reviewer: Steve Carlin <[email protected]>

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