[SPARK-18167] Re-enable the non-flaky parts of SQLQuerySuite

sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/SQLQuerySuite.scala

@@ -1565,27 +1565,16 @@ class SQLQuerySuite extends QueryTest with SQLTestUtils with TestHiveSingleton {
     ).map(i => Row(i._1, i._2, i._3, i._4)))
   }
 
-  ignore("SPARK-10562: partition by column with mixed case name") {
-    def runOnce() {
-      withTable("tbl10562") {
-        val df = Seq(2012 -> "a").toDF("Year", "val")
-        df.write.partitionBy("Year").saveAsTable("tbl10562")
-        checkAnswer(sql("SELECT year FROM tbl10562"), Row(2012))
-        checkAnswer(sql("SELECT Year FROM tbl10562"), Row(2012))
-        checkAnswer(sql("SELECT yEAr FROM tbl10562"), Row(2012))
-        checkAnswer(sql("SELECT val FROM tbl10562 WHERE Year > 2015"), Nil)
-        checkAnswer(sql("SELECT val FROM tbl10562 WHERE Year == 2012"), Row("a"))
-      }
-    }
-    try {
-      runOnce()
-    } catch {
-      case t: Throwable =>
-        // Retry to gather more test data. TODO(ekl) revert this once we deflake this test.
-        runOnce()
-        runOnce()
-        runOnce()
-        throw t
+  test("SPARK-10562: partition by column with mixed case name") {
+    withTable("tbl10562") {
+      val df = Seq(2012 -> "a").toDF("Year", "val")
+      df.write.partitionBy("Year").saveAsTable("tbl10562")
+      checkAnswer(sql("SELECT year FROM tbl10562"), Row(2012))
+      checkAnswer(sql("SELECT Year FROM tbl10562"), Row(2012))
+      checkAnswer(sql("SELECT yEAr FROM tbl10562"), Row(2012))
+// TODO(ekl) this is causing test flakes [SPARK-18167], but we think the issue is derby specific
+//      checkAnswer(sql("SELECT val FROM tbl10562 WHERE Year > 2015"), Nil)
+      checkAnswer(sql("SELECT val FROM tbl10562 WHERE Year == 2012"), Row("a"))
     }
   }