Add Query Function As Alternate Syntax to Query_string Function

core/src/main/java/org/opensearch/sql/expression/DSL.java

@@ -707,6 +707,10 @@ public FunctionExpression simple_query_string(Expression... args) {
     return compile(BuiltinFunctionName.SIMPLE_QUERY_STRING, args);
   }
 
+  public FunctionExpression query(Expression... args) {
+    return compile(BuiltinFunctionName.QUERY, args);
+  }
+
   public FunctionExpression query_string(Expression... args) {
     return compile(BuiltinFunctionName.QUERY_STRING, args);
   }

core/src/main/java/org/opensearch/sql/expression/function/OpenSearchFunctions.java

@@ -30,6 +30,7 @@ public void register(BuiltinFunctionRepository repository) {
     repository.register(match());
     repository.register(multi_match());
     repository.register(simple_query_string());
+    repository.register(query());
     repository.register(query_string());
     // Register MATCHPHRASE as MATCH_PHRASE as well for backwards
     // compatibility.
@@ -68,6 +69,11 @@ private static FunctionResolver simple_query_string() {
     return new RelevanceFunctionResolver(funcName, STRUCT);
   }
 
+  private static FunctionResolver query() {
+    FunctionName funcName = BuiltinFunctionName.QUERY.getName();
+    return new RelevanceFunctionResolver(funcName, STRING);
+  }
+
   private static FunctionResolver query_string() {
     FunctionName funcName = BuiltinFunctionName.QUERY_STRING.getName();
     return new RelevanceFunctionResolver(funcName, STRUCT);

core/src/test/java/org/opensearch/sql/analysis/ExpressionAnalyzerTest.java

@@ -487,6 +487,15 @@ void simple_query_string_expression_two_fields() {
             AstDSL.unresolvedArg("query", stringLiteral("sample query"))));
   }
 
+  @Test
+  void query_expression() {
+    assertAnalyzeEqual(
+            dsl.query(
+                    dsl.namedArgument("query", DSL.literal("field:query"))),
+            AstDSL.function("query",
+                    AstDSL.unresolvedArg("query", stringLiteral("field:query"))));
+  }
+
   @Test
   void query_string_expression() {
     assertAnalyzeEqual(

core/src/test/java/org/opensearch/sql/expression/function/OpenSearchFunctionsTest.java

@@ -183,6 +183,13 @@ void simple_query_string() {
         expr.toString());
   }
 
+  @Test
+  void query() {
+    FunctionExpression expr = dsl.query(query);
+    assertEquals(String.format("query(query=%s)", query.getValue()),
+            expr.toString());
+  }
+
   @Test
   void query_string() {
     FunctionExpression expr = dsl.query_string(fields, query);

docs/user/dql/functions.rst

@@ -3017,6 +3017,67 @@ Another example to show how to set custom values for the optional parameters::
     +------+--------------------------+----------------------+
 
 
+QUERY
+-----
+
+Description
+>>>>>>>>>>>
+
+``query("query_expression" [, option=<option_value>]*)``
+
+The `query` function is an alternative syntax to the `query_string`_ function. It maps to the query_string query used in search engine, to return the documents that match a provided text, number, date or boolean value with a given query expression.
+``query_expression`` must be a string provided in Lucene query string syntax. Please refer to examples below:
+
+| ``query('Tags:taste OR Body:taste', ...)``
+| ``query("Tags:taste AND Body:taste", ...)``
+
+Available parameters include:
+
+- analyzer
+- escape
+- allow_leading_wildcard
+- analyze_wildcard
+- auto_generate_synonyms_phrase_query
+- boost
+- default_operator
+- enable_position_increments
+- fuzziness
+- fuzzy_max_expansions
+- fuzzy_prefix_length
+- fuzzy_transpositions
+- fuzzy_rewrite
+- tie_breaker
+- lenient
+- type
+- max_determinized_states
+- minimum_should_match
+- quote_analyzer
+- phrase_slop
+- quote_field_suffix
+- rewrite
+- time_zone
+
+Example with only ``query_expressions``, and all other parameters are set default values::
+
+    os> select * from books where query('title:Pooh House');
+    fetched rows / total rows = 2/2
+    +------+--------------------------+----------------------+
+    | id   | title                    | author               |
+    |------+--------------------------+----------------------|
+    | 1    | The House at Pooh Corner | Alan Alexander Milne |
+    | 2    | Winnie-the-Pooh          | Alan Alexander Milne |
+    +------+--------------------------+----------------------+
+
+Another example to show how to set custom values for the optional parameters::
+
+    os> select * from books where query('title:Pooh House', default_operator='AND');
+    fetched rows / total rows = 1/1
+    +------+--------------------------+----------------------+
+    | id   | title                    | author               |
+    |------+--------------------------+----------------------|
+    | 1    | The House at Pooh Corner | Alan Alexander Milne |
+    +------+--------------------------+----------------------+
+
 HIGHLIGHT
 ------------
 

integ-test/src/test/java/org/opensearch/sql/legacy/MethodQueryIT.java

@@ -38,7 +38,7 @@ public void queryTest() throws IOException {
         "select address from %s where query('address:880 Holmes Lane') limit 3",
         TestsConstants.TEST_INDEX_ACCOUNT));
     Assert.assertThat(result,
-        containsString("query_string\":{\"query\":\"address:880 Holmes Lane"));
+        containsString("query_string\\\":{\\\"query\\\":\\\"address:880 Holmes Lane"));
 
   }
 

integ-test/src/test/java/org/opensearch/sql/sql/QueryIT.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.sql.sql;
+
+import static org.opensearch.sql.legacy.TestsConstants.TEST_INDEX_BEER;
+
+import java.io.IOException;
+import org.json.JSONObject;
+import org.junit.Test;
+import org.opensearch.sql.legacy.SQLIntegTestCase;
+
+public class QueryIT extends SQLIntegTestCase {
+    @Override
+    public void init() throws IOException {
+        loadIndex(Index.BEER);
+    }
+
+    @Test
+    public void all_fields_test() throws IOException {
+        String query = "SELECT * FROM "
+                + TEST_INDEX_BEER + " WHERE query('*:taste')";
+        JSONObject result = executeJdbcRequest(query);
+        assertEquals(16, result.getInt("total"));
+    }
+
+    @Test
+    public void mandatory_params_test() throws IOException {
+        String query = "SELECT Id FROM "
+                + TEST_INDEX_BEER + " WHERE query('Tags:taste OR Body:taste')";
+        JSONObject result = executeJdbcRequest(query);
+        assertEquals(16, result.getInt("total"));
+    }
+
+    @Test
+    public void all_params_test() throws IOException {
+        String query = "SELECT Id FROM " + TEST_INDEX_BEER
+                + " WHERE query('Tags:taste', escape=false,"
+                + "allow_leading_wildcard=true, enable_position_increments=true,"
+                + "fuzziness= 1, fuzzy_rewrite='constant_score', max_determinized_states = 10000,"
+                + "analyzer='standard', analyze_wildcard = false, quote_field_suffix = '.exact',"
+                + "auto_generate_synonyms_phrase_query=true, boost = 0.77,"
+                + "quote_analyzer='standard', phrase_slop=0, rewrite='constant_score', type='best_fields',"
+                + "tie_breaker=0.3, time_zone='Canada/Pacific', default_operator='or',"
+                + "fuzzy_transpositions = false, lenient = true, fuzzy_max_expansions = 25,"
+                + "minimum_should_match = '2<-25% 9<-3', fuzzy_prefix_length = 7);";
+        JSONObject result = executeJdbcRequest(query);
+        assertEquals(8, result.getInt("total"));
+    }
+
+    @Test
+    public void wildcard_test() throws IOException {
+        String query1 = "SELECT Id FROM "
+                + TEST_INDEX_BEER + " WHERE query('Tags:taste')";
+        JSONObject result1 = executeJdbcRequest(query1);
+        String query2 = "SELECT Id FROM "
+                + TEST_INDEX_BEER + " WHERE query('*:taste')";
+        JSONObject result2 = executeJdbcRequest(query2);
+        assertNotEquals(result2.getInt("total"), result1.getInt("total"));
+
+        String query3 = "SELECT Id FROM " + TEST_INDEX_BEER
+                + " WHERE query('Tags:tas*');";
+        JSONObject result3 = executeJdbcRequest(query3);
+        assertEquals(8, result3.getInt("total"));
+
+        String query4 = "SELECT Id FROM " + TEST_INDEX_BEER
+                + " WHERE query('Tags:tas?e');";
+        JSONObject result4 = executeJdbcRequest(query3);
+        assertEquals(8, result4.getInt("total"));
+    }
+
+    @Test
+    public void query_string_and_query_return_the_same_results_test() throws IOException {
+        String query1 = "SELECT Id FROM "
+                + TEST_INDEX_BEER + " WHERE query('Tags:taste')";
+        JSONObject result1 = executeJdbcRequest(query1);
+        String query2 = "SELECT Id FROM "
+                + TEST_INDEX_BEER + " WHERE query_string(['Tags'],'taste')";
+        JSONObject result2 = executeJdbcRequest(query2);
+        assertEquals(result2.getInt("total"), result1.getInt("total"));
+    }
+}

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

@@ -34,6 +34,7 @@
 import org.opensearch.sql.opensearch.storage.script.filter.lucene.relevance.MatchPhraseQuery;
 import org.opensearch.sql.opensearch.storage.script.filter.lucene.relevance.MatchQuery;
 import org.opensearch.sql.opensearch.storage.script.filter.lucene.relevance.MultiMatchQuery;
+import org.opensearch.sql.opensearch.storage.script.filter.lucene.relevance.QueryQuery;
 import org.opensearch.sql.opensearch.storage.script.filter.lucene.relevance.QueryStringQuery;
 import org.opensearch.sql.opensearch.storage.script.filter.lucene.relevance.SimpleQueryStringQuery;
 import org.opensearch.sql.opensearch.storage.serialization.ExpressionSerializer;
@@ -60,7 +61,7 @@ public class FilterQueryBuilder extends ExpressionNodeVisitor<QueryBuilder, Obje
           .put(BuiltinFunctionName.MATCH.getName(), new MatchQuery())
           .put(BuiltinFunctionName.MATCH_PHRASE.getName(), new MatchPhraseQuery())
           .put(BuiltinFunctionName.MATCHPHRASE.getName(), new MatchPhraseQuery())
-          .put(BuiltinFunctionName.QUERY.getName(), new MatchQuery())
+          .put(BuiltinFunctionName.QUERY.getName(), new QueryQuery())
           .put(BuiltinFunctionName.MATCH_QUERY.getName(), new MatchQuery())
           .put(BuiltinFunctionName.MATCHQUERY.getName(), new MatchQuery())
           .put(BuiltinFunctionName.MULTI_MATCH.getName(), new MultiMatchQuery())

opensearch/src/main/java/org/opensearch/sql/opensearch/storage/script/filter/lucene/relevance/NoFieldQuery.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.sql.opensearch.storage.script.filter.lucene.relevance;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.stream.Collectors;
+import org.opensearch.index.query.QueryBuilder;
+import org.opensearch.sql.common.antlr.SyntaxCheckException;
+import org.opensearch.sql.exception.SemanticCheckException;
+import org.opensearch.sql.expression.FunctionExpression;
+import org.opensearch.sql.expression.NamedArgumentExpression;
+
+/**
+ * Base class to represent relevance queries that have no 'fields' array as an argument.
+ *
+ * @param <T> The builder class for the OpenSearch query.
+ */
+abstract class NoFieldQuery<T extends QueryBuilder> extends RelevanceQuery<T> {
+  public NoFieldQuery(Map<String, QueryBuilderStep<T>> queryBuildActions) {
+    super(queryBuildActions);
+  }
+
+  @Override
+  protected void ignoreArguments(List<NamedArgumentExpression> arguments) {
+    arguments.removeIf(a -> a.getArgName().equalsIgnoreCase("query"));
+  }
+
+  @Override
+  protected void checkValidArguments(String argNormalized, T queryBuilder) {
+    if (!getQueryBuildActions().containsKey(argNormalized)) {
+      throw new SemanticCheckException(
+              String.format("Parameter %s is invalid for %s function.",
+                      argNormalized, getQueryName()));
+    }
+  }
+  /**
+   * Override build function because RelevanceQuery requires 2 fields,
+   * but NoFieldQuery must have no fields.
+   *
+   * @param func : Contains function name and passed in arguments.
+   * @return : QueryBuilder object
+   */
+
+  @Override
+  public QueryBuilder build(FunctionExpression func) {
+    var arguments = func.getArguments().stream().map(
+        a -> (NamedArgumentExpression) a).collect(Collectors.toList());
+    if (arguments.size() < 1) {
+      throw new SyntaxCheckException(String.format(
+          "%s requires at least one parameter", func.getFunctionName()));
+    }
+
+    return loadArguments(arguments);
+  }
+
+
+  @Override
+  public T createQueryBuilder(List<NamedArgumentExpression> arguments) {
+    // Extract 'query'
+    var query = arguments.stream().filter(a -> a.getArgName().equalsIgnoreCase("query")).findFirst()
+        .orElseThrow(() -> new SemanticCheckException("'query' parameter is missing"));
+
+    return createBuilder(query.getValue().valueOf(null).stringValue());
+  }
+
+  protected abstract T createBuilder(String query);
+}

opensearch/src/main/java/org/opensearch/sql/opensearch/storage/script/filter/lucene/relevance/QueryQuery.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright OpenSearch Contributors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package org.opensearch.sql.opensearch.storage.script.filter.lucene.relevance;
+
+import org.opensearch.index.query.QueryBuilders;
+import org.opensearch.index.query.QueryStringQueryBuilder;
+
+/**
+ * Class for Lucene query that builds the 'query' query.
+ */
+public class QueryQuery extends NoFieldQuery<QueryStringQueryBuilder> {
+
+  private final String queryQueryName = "query";
+
+  /**
+   * Default constructor for QueryQuery configures how RelevanceQuery.build() handles
+   * named arguments by calling the constructor of QueryStringQuery.
+   */
+  public QueryQuery() {
+    super(FunctionParameterRepository.QueryStringQueryBuildActions);
+  }
+
+  /**
+   * Builds QueryBuilder with query value and other default parameter values set.
+   *
+   * @param query : Query value for query_string query
+   * @return : Builder for query query
+   */
+  protected QueryStringQueryBuilder createBuilder(String query) {
+    return QueryBuilders.queryStringQuery(query);
+  }
+
+  @Override
+  public String getQueryName() {
+    return queryQueryName;
+  }
+}