Added casts to HAVING expressions

Author: willb

sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala

@@ -587,8 +587,11 @@ private[hive] object HiveQl {
             throw new SemanticException("HAVING specified without GROUP BY")
           }
 
-          val Seq(havingExpr) = h.getChildren.toSeq
-          Filter(nodeToExpr(havingExpr), withDistinct)
+          val havingExpr = h.getChildren.toSeq match {
+            case Seq(hexpr) => nodeToExpr(hexpr)
+          }
+          
+          Filter(Cast(havingExpr, BooleanType), withDistinct)
         }.getOrElse(withDistinct)
 
         val withSort =

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

@@ -230,7 +230,8 @@ class HiveQuerySuite extends HiveComparisonTest {
 
     TestHive.sparkContext.parallelize(fixture).registerAsTable("having_test")
 
-    val results = hql("SELECT value, max(attr) AS attr FROM having_test GROUP BY value HAVING attr > 3")
+    val results = 
+      hql("SELECT value, max(attr) AS attr FROM having_test GROUP BY value HAVING attr > 3")
       .collect()
       .map(x => Pair(x.getString(0), x.getInt(1)))
 
@@ -244,6 +245,10 @@ class HiveQuerySuite extends HiveComparisonTest {
       hql("SELECT value, attr FROM having_test HAVING attr > 3")
     }
   }
+  
+  test("SPARK-2180:  HAVING with non-boolean clause raises no exceptions") {
+    val results = hql("select key, count(*) c from src group by key having c").collect()
+  }
 
   test("Query Hive native command execution result") {
     val tableName = "test_native_commands"