[SPARK-11434][SPARK-11103][SQL] Fix test ": Filter applied on merged Parquet...

[SPARK-11434][SPARK-11103][SQL] Fix test ": Filter applied on merged Parquet schema with new column fails"

https://issues.apache.org/jira/browse/SPARK-11434

Author: Yin Huai <yhuai@databricks.com>

Closes #9387 from yhuai/SPARK-11434.