Aleksandr Efimov has uploaded this change for review. ( 
http://gerrit.cloudera.org:8080/24894


Change subject: IMPALA-15361: Read Hive 4 timestamp stats
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IMPALA-15361: Read Hive 4 timestamp stats

Hive 4 can return persisted TIMESTAMP NDV and null counts in
DateColumnStatsData, while Impala also uses LongColumnStatsData.
Accept both forms and keep min and max values unset for TIMESTAMP.

Add unit coverage for both representations.

Testing:
- ColumnStatsTest

Change-Id: I0b99acbe65665226938b2e4ac5191063d3925426
Assisted-by: gpt-5.6-sol (OpenAI Codex)
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M fe/src/main/java/org/apache/impala/catalog/ColumnStats.java
A fe/src/test/java/org/apache/impala/catalog/ColumnStatsTest.java
2 files changed, 68 insertions(+), 5 deletions(-)



  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/94/24894/1
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I0b99acbe65665226938b2e4ac5191063d3925426
Gerrit-Change-Number: 24894
Gerrit-PatchSet: 1
Gerrit-Owner: Aleksandr Efimov <[email protected]>

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