Fix DataSourceMetadataResultValue serde.

processing/src/main/java/io/druid/query/datasourcemetadata/DataSourceMetadataQuery.java

@@ -22,7 +22,6 @@ package io.druid.query.datasourcemetadata;
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.google.common.collect.Lists;
-import com.google.common.collect.Maps;
 import io.druid.common.utils.JodaUtils;
 import io.druid.query.BaseQuery;
 import io.druid.query.DataSource;
@@ -45,9 +44,6 @@ public class DataSourceMetadataQuery extends BaseQuery<Result<DataSourceMetadata
       JodaUtils.MIN_INSTANT, JodaUtils.MAX_INSTANT
   );
 
-  public static String MAX_INGESTED_EVENT_TIME = "maxIngestedEventTime";
-
-
   @JsonCreator
   public DataSourceMetadataQuery(
       @JsonProperty("dataSource") DataSource dataSource,

processing/src/main/java/io/druid/query/datasourcemetadata/DataSourceMetadataResultValue.java

@@ -20,7 +20,7 @@
 package io.druid.query.datasourcemetadata;
 
 import com.fasterxml.jackson.annotation.JsonCreator;
-import com.fasterxml.jackson.annotation.JsonValue;
+import com.fasterxml.jackson.annotation.JsonProperty;
 import org.joda.time.DateTime;
 
 /**
@@ -31,13 +31,13 @@ public class DataSourceMetadataResultValue
 
   @JsonCreator
   public DataSourceMetadataResultValue(
-      DateTime maxIngestedEventTime
+      @JsonProperty("maxIngestedEventTime") DateTime maxIngestedEventTime
   )
   {
     this.maxIngestedEventTime = maxIngestedEventTime;
   }
 
-  @JsonValue
+  @JsonProperty
   public DateTime getMaxIngestedEventTime()
   {
     return maxIngestedEventTime;

processing/src/test/java/io/druid/query/datasourcemetadata/DataSourceMetadataQueryTest.java

@@ -21,6 +21,7 @@
 
 package io.druid.query.datasourcemetadata;
 
+import com.fasterxml.jackson.core.type.TypeReference;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
@@ -40,7 +41,6 @@ import io.druid.query.aggregation.AggregatorFactory;
 import io.druid.query.aggregation.CountAggregatorFactory;
 import io.druid.query.timeboundary.TimeBoundaryQueryQueryToolChest;
 import io.druid.segment.IncrementalIndexSegment;
-import io.druid.segment.TestIndex;
 import io.druid.segment.incremental.IncrementalIndex;
 import io.druid.segment.incremental.OnheapIncrementalIndex;
 import io.druid.timeline.LogicalSegment;
@@ -113,7 +113,8 @@ public class DataSourceMetadataQueryTest
   {
     final IncrementalIndex rtIndex = new OnheapIncrementalIndex(
         0L, QueryGranularity.NONE, new AggregatorFactory[]{new CountAggregatorFactory("count")}, 1000
-    );;
+    );
+    ;
     final QueryRunner runner = QueryRunnerTestHelper.makeQueryRunner(
         (QueryRunnerFactory) new DataSourceMetadataQueryRunnerFactory(
             QueryRunnerTestHelper.NOOP_QUERYWATCHER
@@ -209,4 +210,34 @@ public class DataSourceMetadataQueryTest
     }
   }
 
+  @Test
+  public void testResultSerialization()
+  {
+    final DataSourceMetadataResultValue resultValue = new DataSourceMetadataResultValue(new DateTime("2000-01-01T00Z"));
+    final Map<String, Object> resultValueMap = new DefaultObjectMapper().convertValue(
+        resultValue,
+        new TypeReference<Map<String, Object>>()
+        {
+        }
+    );
+    Assert.assertEquals(
+        ImmutableMap.<String, Object>of("maxIngestedEventTime", "2000-01-01T00:00:00.000Z"),
+        resultValueMap
+    );
+  }
+
+  @Test
+  public void testResultDeserialization()
+  {
+    final Map<String, Object> resultValueMap = ImmutableMap.<String, Object>of(
+        "maxIngestedEventTime",
+        "2000-01-01T00:00:00.000Z"
+    );
+    final DataSourceMetadataResultValue resultValue = new DefaultObjectMapper().convertValue(
+        resultValueMap,
+        DataSourceMetadataResultValue.class
+    );
+    Assert.assertEquals(new DateTime("2000"), resultValue.getMaxIngestedEventTime());
+  }
+
 }