Move rewrite logic for filter to doRewrite method

Signed-off-by: Martin Gaievski <[email protected]>
martin-gaievski · Jul 24, 2024 · e816417 · e816417
1 parent b670b11
commit e816417
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -16,7 +16,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 ### Features
 ### Enhancements
 ### Bug Fixes
-* Return empty results for non-existent filter fields [#1874](https://github.com/opensearch-project/k-NN/pull/1874)
+* Corrected search logic for scenario with non-existent fields in filter [#1874](https://github.com/opensearch-project/k-NN/pull/1874)
 ### Infrastructure
 ### Documentation
 ### Maintenance

diff --git a/src/main/java/org/opensearch/knn/index/query/KNNQueryBuilder.java b/src/main/java/org/opensearch/knn/index/query/KNNQueryBuilder.java
@@ -24,6 +24,7 @@
 import org.opensearch.index.mapper.NumberFieldMapper;
 import org.opensearch.index.query.AbstractQueryBuilder;
 import org.opensearch.index.query.QueryBuilder;
+import org.opensearch.index.query.QueryRewriteContext;
 import org.opensearch.index.query.QueryShardContext;
 import org.opensearch.knn.common.KNNConstants;
 import org.opensearch.knn.index.IndexUtil;
@@ -485,7 +486,7 @@ public void doXContent(XContentBuilder builder, Params params) throws IOExceptio
     }
 
     @Override
-    protected Query doToQuery(QueryShardContext context) throws IOException {
+    protected Query doToQuery(QueryShardContext context) {
         MappedFieldType mappedFieldType = context.fieldMapper(this.fieldName);
 
         if (mappedFieldType == null && ignoreUnmapped) {
@@ -600,11 +601,6 @@ protected Query doToQuery(QueryShardContext context) throws IOException {
             throw new IllegalArgumentException(String.format(Locale.ROOT, "Engine [%s] does not support filters", knnEngine));
         }
 
-        // rewrite filter query if it exists to avoid runtime errors in next steps of query phase
-        if (Objects.nonNull(filter)) {
-            filter = filter.rewrite(context);
-        }
-
         String indexName = context.index().getName();
 
         if (k != 0) {
@@ -715,4 +711,13 @@ protected int doHashCode() {
     public String getWriteableName() {
         return NAME;
     }
+
+    @Override
+    protected QueryBuilder doRewrite(QueryRewriteContext queryShardContext) throws IOException {
+        // rewrite filter query if it exists to avoid runtime errors in next steps of query phase
+        if (Objects.nonNull(filter)) {
+            filter = filter.rewrite(queryShardContext);
+        }
+        return super.doRewrite(queryShardContext);
+    }
 }
diff --git a/src/test/java/org/opensearch/knn/index/query/KNNQueryBuilderTests.java b/src/test/java/org/opensearch/knn/index/query/KNNQueryBuilderTests.java
@@ -27,6 +27,7 @@
 import org.opensearch.index.mapper.NumberFieldMapper;
 import org.opensearch.index.query.QueryBuilder;
 import org.opensearch.index.query.QueryBuilders;
+import org.opensearch.index.query.QueryRewriteContext;
 import org.opensearch.index.query.QueryShardContext;
 import org.opensearch.index.query.TermQueryBuilder;
 import org.opensearch.knn.KNNTestCase;
@@ -1306,4 +1307,19 @@ public void testDoToQuery_whenBinaryWithInvalidDimension_thenException() throws
         Exception ex = expectThrows(IllegalArgumentException.class, () -> knnQueryBuilder.doToQuery(mockQueryShardContext));
         assertTrue(ex.getMessage(), ex.getMessage().contains("invalid dimension"));
     }
+
+    @SneakyThrows
+    public void testDoRewrite_whenNoFilter_thenSuccessful() {
+        KNNQueryBuilder knnQueryBuilder = new KNNQueryBuilder(FIELD_NAME, QUERY_VECTOR, K);
+        QueryBuilder rewritten = knnQueryBuilder.doRewrite(mock(QueryRewriteContext.class));
+        assertEquals(knnQueryBuilder, rewritten);
+    }
+
+    @SneakyThrows
+    public void testDoRewrite_whenFilterSet_thenSuccessful() {
+        QueryBuilder filter = QueryBuilders.termQuery("some_field", "some_value");
+        KNNQueryBuilder knnQueryBuilder = new KNNQueryBuilder(FIELD_NAME, QUERY_VECTOR, K, filter);
+        QueryBuilder rewritten = knnQueryBuilder.doRewrite(mock(QueryRewriteContext.class));
+        assertEquals(knnQueryBuilder, rewritten);
+    }
 }