Improvement test.

Author: wangyum

sql/core/src/test/scala/org/apache/spark/sql/execution/datasources/parquet/ParquetFilterSuite.scala

@@ -1021,6 +1021,18 @@ class ParquetFilterSuite extends QueryTest with ParquetTest with SharedSQLContex
       }
     }
   }
+
+  test("SPARK-25206: wrong records are returned when Hive metastore schema and parquet schema " +
+    "are in different letter cases") {
+    withTempPath { path =>
+      val data = spark.range(1, 10).toDF("id")
+      data.write.parquet(path.getCanonicalPath)
+      withTable("SPARK_25206") {
+        sql(s"CREATE TABLE SPARK_25206 (ID LONG) USING parquet LOCATION '${path.getCanonicalPath}'")
+        checkAnswer(sql("select id from SPARK_25206 where id > 0"), data)
+      }
+    }
+  }
 }
 
 class NumRowGroupsAcc extends AccumulatorV2[Integer, Integer] {