[Impala-CR](cdh5-trunk) IMPALA-3687: Use type from Avro schema during schema reconciliation.

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

Huaisi Xu has uploaded a new patch set (#4).

Change subject: IMPALA-3687: Use type from Avro schema during schema reconciliation.
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IMPALA-3687: Use type from Avro schema during schema reconciliation.

There is no effect that we change the name of a STRING/CHAR/VARCHAR
column in schema definition because impala uses column defnition
for these types. This patch changes the behavior to that impala
only uses type from column definition. This is to preserve support
for CHAR/VARCHAR column type.

Change-Id: Ia3e43b2885853c2b4f207a45a873c9d7f31379cd
---
M fe/src/main/java/com/cloudera/impala/util/AvroSchemaUtils.java
M testdata/workloads/functional-query/queries/QueryTest/avro-schema-changes.test
2 files changed, 59 insertions(+), 9 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala refs/changes/31/3331/4
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ia3e43b2885853c2b4f207a45a873c9d7f31379cd
Gerrit-PatchSet: 4
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>