[Impala-CR](cdh5-trunk) IMPALA-3687: Prefer Avro field name during schema reconciliation

["Huaisi Xu (Code Review)" <ge...@cloudera.org>]

Hello Bharath Vissapragada,

I'd like you to reexamine a change.  Please visit

    http://gerrit.cloudera.org:8080/3331

to look at the new patch set (#5).

Change subject: IMPALA-3687: Prefer Avro field name during schema reconciliation
......................................................................

IMPALA-3687: Prefer Avro field name during schema reconciliation

Currently Impala prefers schema definition from schema definition
except for CHAR/VARCHAR/STRING columns. As a result, Impala ignores
schema changes made in avro.schema.url or avro.schema.literal.

This patch prefers name, comment from Avro schema definition and
uses column type from column definition for CHAR/VARCHAR/STRING
columns.

Change-Id: Ia3e43b2885853c2b4f207a45a873c9d7f31379cd
---
M fe/src/main/java/com/cloudera/impala/util/AvroSchemaConverter.java
M fe/src/main/java/com/cloudera/impala/util/AvroSchemaUtils.java
M testdata/workloads/functional-query/queries/QueryTest/avro-schema-changes.test
M testdata/workloads/functional-query/queries/QueryTest/avro-schema-resolution.test
4 files changed, 65 insertions(+), 10 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala refs/changes/31/3331/5
-- 
To view, visit http://gerrit.cloudera.org:8080/3331
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ia3e43b2885853c2b4f207a45a873c9d7f31379cd
Gerrit-PatchSet: 5
Gerrit-Project: Impala
Gerrit-Branch: cdh5-trunk
Gerrit-Owner: Huaisi Xu <hx...@cloudera.com>
Gerrit-Reviewer: Alex Behm <al...@cloudera.com>
Gerrit-Reviewer: Bharath Vissapragada <bh...@cloudera.com>
Gerrit-Reviewer: Huaisi Xu <hx...@cloudera.com>