GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/15900
[SPARK-18464][SQL] support old table which doesn't store schema in metastore
## What changes were proposed in this pull request?
Before Spark 2.1, users can create an external data source table without
schema, and we will infer the table schema at runtime. In Spark 2.1, we decided
to infer the schema when the table was created, so that we don't need to infer
it again and again at runtime.
This is a good improvement, but we should still respect and support old
tables which doesn't store table schema in metastore.
## How was this patch tested?
regression test.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/cloud-fan/spark hive-catalog
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/15900.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #15900
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commit a75cf309a4141da0271bca11769b8355bb493758
Author: Wenchen Fan <wenc...@databricks.com>
Date: 2016-11-16T06:09:18Z
support old table which doesn't store schema in table properties
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