Properly cache parent/child queries in the case they are wrapped in a compound filter.

Closes #2971

src/main/java/org/elasticsearch/index/search/child/ChildrenQuery.java

@@ -83,6 +83,36 @@ public class ChildrenQuery extends Query implements SearchContext.Rewrite {
         this.uidToCount = unProcessedQuery.uidToCount;
     }
 
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null || obj.getClass() != this.getClass()) {
+            return false;
+        }
+
+        HasChildFilter that = (HasChildFilter) obj;
+        if (!originalChildQuery.equals(that.childQuery)) {
+            return false;
+        }
+        if (!childType.equals(that.childType)) {
+            return false;
+        }
+        if (!parentType.equals(that.parentType)) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = originalChildQuery.hashCode();
+        result = 31 * result + parentType.hashCode();
+        result = 31 * result + childType.hashCode();
+        return result;
+    }
+
     @Override
     public String toString(String field) {
         StringBuilder sb = new StringBuilder();

src/main/java/org/elasticsearch/index/search/child/ParentQuery.java

@@ -96,6 +96,32 @@ public class ParentQuery extends Query implements SearchContext.Rewrite {
         uidToScore = null;
     }
 
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null || obj.getClass() != this.getClass()) {
+            return false;
+        }
+
+        HasParentFilter that = (HasParentFilter) obj;
+        if (!originalParentQuery.equals(that.parentQuery)) {
+            return false;
+        }
+        if (!parentType.equals(that.parentType)) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = originalParentQuery.hashCode();
+        result = 31 * result + parentType.hashCode();
+        return result;
+    }
+
     @Override
     public String toString(String field) {
         StringBuilder sb = new StringBuilder();

src/main/java/org/elasticsearch/index/search/child/TopChildrenQuery.java

@@ -252,6 +252,36 @@ public class TopChildrenQuery extends Query implements SearchContext.Rewrite {
         return new ParentWeight(searcher, rewrittenChildQuery.createWeight(searcher));
     }
 
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null || obj.getClass() != this.getClass()) {
+            return false;
+        }
+
+        HasChildFilter that = (HasChildFilter) obj;
+        if (!originalChildQuery.equals(that.childQuery)) {
+            return false;
+        }
+        if (!childType.equals(that.childType)) {
+            return false;
+        }
+        if (!parentType.equals(that.parentType)) {
+            return false;
+        }
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = originalChildQuery.hashCode();
+        result = 31 * result + parentType.hashCode();
+        result = 31 * result + childType.hashCode();
+        return result;
+    }
+
     public String toString(String field) {
         StringBuilder sb = new StringBuilder();
         sb.append("score_child[").append(childType).append("/").append(parentType).append("](").append(originalChildQuery.toString(field)).append(')');