Seonggon Namgung

HIVE-26986: Fix OperatorGraph when a query plan contains UnionOperator

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### What changes were proposed in this pull request? I rewrite OperatorGraph to make sure that OperatorGraph represents actual Tez DAG. In new OperatorGraph, each cluster has a unique root...

TEZ-4061: InputAttemptIdentifier and CompositeInputAttemptIdentifier cannot be compared for equality

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https://issues.apache.org/jira/browse/TEZ-4061

HIVE-28327: Fix TruncDateFromTimestamp

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### What changes were proposed in this pull request? Do null-check and skip applying truncDate() if input is null. ### Why are the changes needed? Current TimeDateFromString throws NullPointerException due...

HIVE-28300: Fix AlterTableConcatenate when using Hive-Tez

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### What changes were proposed in this pull request? Modify AlterTableConcatenateOperation to refer to MergeFileWork.getInputPaths(). ### Why are the changes needed? When using a List Bucketing table, FileMergeOperator expects only...

HIVE-28489: Partition the input data of GroupBy with GroupingSet

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### What changes were proposed in this pull request? This patch introduces a new optimization for GroupBy with GroupingSet. GroupingSet often emits too much rows and becomes a bottleneck of...

HIVE-28488: Merge multiple adjacent union distinct into single adjacent union distinct

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### What changes were proposed in this pull request? This PR proposed a new optimization to reduce the shuffle when computing union distinct of multiple tables. The new optimization merges...

HIVE-28490: Stop removing retainable DPP sources

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### What changes were proposed in this pull request? This patch changes the implementation of SharedWorkOptimizer#findAscendantWorkOperators. For a given operator, original findAscendantWorkOperators() returns a set of operators that belongs to...

HIVE-27082: AggregateStatsCache.findBestMatch() tests the inclusion of default partition name.

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### What changes were proposed in this pull request? AggregateStatsCache.findBestMatch() in Metastore should test the inclusion of default partition name \_\_HIVE_DEFAULT_PARTITION\_\_. ### Why are the changes needed? To avoid the...

[WIP] HIVE-27473: Rewrite MetaStoreClients to be composable

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Design document: [Google docs](https://docs.google.com/document/d/1lppPj35fBOOCjGNIouoJCsniMPpyzWx3zcE7kvu0Be4/edit?usp=sharing) ### What changes were proposed in this pull request? This patch refactors `HiveMetaStoreClient` and its subclasses in composable classes. ### Why are the changes needed? By...