Huaisi Xu c6ce32b3b6 IMPALA-3687: Prefer Avro field name during schema reconciliation ...

Since it is possible to create an Avro table with both column
definitions and an Avro schema, Impala attempts to reconcile
inconsistencies in the two schema definitions, generally preferring the
Avro schema. The only exception to this rule was with
CHAR/VARCHAR/STRING columns, where the column definition was preferred
in order to support tables with CHAR/VARCHAR columns although Avro only
supports STRING. This exception is confusing because the name for such a
column will be taken from the column definition (and not from the Avro
schema).

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

Change-Id: Ia3e43b2885853c2b4f207a45a873c9d7f31379cd
Reviewed-on: http://gerrit.cloudera.org:8080/3331
Reviewed-by: Huaisi Xu <hxu@cloudera.com>
Tested-by: Internal Jenkins

2016-07-14 19:04:43 +00:00

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