[Impala-ASF-CR] IMPALA-11812: Deduplicate column list in hmsPartitions

["Quanlong Huang (Code Review)" <ge...@cloudera.org>]

Quanlong Huang has uploaded a new patch set (#2). ( http://gerrit.cloudera.org:8080/19391 )

Change subject: IMPALA-11812: Deduplicate column list in hmsPartitions
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IMPALA-11812: Deduplicate column list in hmsPartitions

A list of HMS Partitions will be created in many workloads in catalogd,
e.g. table loading, bulk altering partitions by ComputeStats or
AlterTableRecoverPartitions, etc. Currently, each of hmsPartition hold a
unique list of column schema, i.e. a List<FieldSchema>. This results in
lots of FieldSchema instances if the table is wide and lots of
partitions need to be loaded/operated. Though the strings of column
names and comments are interned. The FieldSchema objects could still
occupy the majority of the heap. See the histogram in JIRA description.

In fact, the hmsPartition instances of a table can share the column
schema (either from the hmsTable or other hmsPartition instances) since
Impala doesn't respect the partition level schema.

This patch add codes to deduplicate column list in StorageDescriptor of
hmsPartitions. Also add some progress logs in batch HMS operations to
improve supportability.

Tests:
 - Ran CORE tests

Change-Id: I511ecca0ace8bea4c24a19a54fb0a75390e50c4d
---
M fe/src/main/java/org/apache/impala/catalog/HdfsTable.java
M fe/src/main/java/org/apache/impala/catalog/events/MetastoreEvents.java
M fe/src/main/java/org/apache/impala/service/CatalogOpExecutor.java
M fe/src/main/java/org/apache/impala/util/MetaStoreUtil.java
4 files changed, 55 insertions(+), 6 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/91/19391/2
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I511ecca0ace8bea4c24a19a54fb0a75390e50c4d
Gerrit-Change-Number: 19391
Gerrit-PatchSet: 2
Gerrit-Owner: Quanlong Huang <hu...@gmail.com>