Add Support for Nested Function Use In WHERE Clause Predicate Expresion (opensearch-project#1657)

* Adding support for nested function used in predicate expression.

Signed-off-by: forestmvey <[email protected]>

* Add support for LIKE with nested query in predicate expression.

Signed-off-by: forestmvey <[email protected]>

---------

Signed-off-by: forestmvey <[email protected]>

Author: forestmvey

opensearch/src/main/java/org/opensearch/sql/opensearch/request/OpenSearchRequestBuilder.java

@@ -14,6 +14,7 @@
 import static org.opensearch.search.sort.SortOrder.ASC;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
 import java.util.Map;
@@ -280,10 +281,6 @@ private List<NestedQueryBuilder> extractNestedQueries(QueryBuilder query) {
     return result;
   }
 
-  public int getMaxResponseSize() {
-    return pageSize == null ? requestedTotalSize : pageSize;
-  }
-
   /**
    * Initialize bool query for push down.
    */

opensearch/src/main/java/org/opensearch/sql/opensearch/storage/script/filter/FilterQueryBuilder.java

@@ -14,15 +14,18 @@
 import java.util.Map;
 import java.util.function.BiFunction;
 import lombok.RequiredArgsConstructor;
+import org.apache.lucene.search.join.ScoreMode;
 import org.opensearch.index.query.BoolQueryBuilder;
 import org.opensearch.index.query.QueryBuilder;
 import org.opensearch.index.query.QueryBuilders;
 import org.opensearch.index.query.ScriptQueryBuilder;
 import org.opensearch.script.Script;
+import org.opensearch.sql.ast.expression.Function;
 import org.opensearch.sql.common.antlr.SyntaxCheckException;
 import org.opensearch.sql.expression.Expression;
 import org.opensearch.sql.expression.ExpressionNodeVisitor;
 import org.opensearch.sql.expression.FunctionExpression;
+import org.opensearch.sql.expression.ReferenceExpression;
 import org.opensearch.sql.expression.function.BuiltinFunctionName;
 import org.opensearch.sql.expression.function.FunctionName;
 import org.opensearch.sql.opensearch.storage.script.filter.lucene.LikeQuery;

opensearch/src/test/java/org/opensearch/sql/opensearch/request/OpenSearchRequestBuilderTest.java

@@ -384,20 +384,22 @@ void testPushDownNestedWithNestedFilter() {
         .innerHit(new InnerHitBuilder().setFetchSourceContext(
             new FetchSourceContext(true, new String[]{"message.info"}, null)));
 
-    assertSearchSourceBuilder(new SearchSourceBuilder()
-        .query(
-          QueryBuilders.boolQuery().filter(
-            QueryBuilders.boolQuery()
-              .must(filterQuery)
-        )
-      )
-        .from(DEFAULT_OFFSET)
-        .size(DEFAULT_LIMIT)
-        .timeout(DEFAULT_QUERY_TIMEOUT), requestBuilder);
+    assertEquals(
+        new SearchSourceBuilder()
+            .query(
+                QueryBuilders.boolQuery().filter(
+                    QueryBuilders.boolQuery()
+                        .must(filterQuery)
+                )
+            )
+            .from(DEFAULT_OFFSET)
+            .size(DEFAULT_LIMIT)
+            .timeout(DEFAULT_QUERY_TIMEOUT),
+        requestBuilder.getSourceBuilder());
   }
 
   @Test
-  void test_push_type_mapping() {
+  void testPushTypeMapping() {
     Map<String, OpenSearchDataType> typeMapping = Map.of("intA", OpenSearchDataType.of(INTEGER));
     requestBuilder.pushTypeMapping(typeMapping);