konstantinb commented on code in PR #6244:
URL: https://github.com/apache/hive/pull/6244#discussion_r2776483842
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ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFCoalesce.java:
##########
@@ -45,13 +48,16 @@
public class GenericUDFCoalesce extends GenericUDF implements
StatEstimatorProvider {
Review Comment:
I agree that the update to CASE/WHEN/IF do not directly apply to
COACECENSCE. applying a specific fix to return MAX(NDV(col1), ... NDV(colN)) +
(1 if there's a trailing constant)
##########
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFCoalesce.java:
##########
@@ -45,13 +48,16 @@
public class GenericUDFCoalesce extends GenericUDF implements
StatEstimatorProvider {
Review Comment:
I agree that the updates to CASE/WHEN/IF do not directly apply to
COACECENSCE. applying a specific fix to return MAX(NDV(col1), ... NDV(colN)) +
(1 if there's a trailing constant)
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