Update QueryBuilder.

Author: gk-brown

kilo-client/src/main/java/org/httprpc/kilo/sql/QueryBuilder.java

@@ -1012,6 +1012,19 @@ public QueryBuilder filterByIndexLessThanOrEqualTo(String key) {
         return filterByIndex("<=", key);
     }
 
+    /**
+     * Appends one or more "equal to" filters.
+     *
+     * @param keys
+     * The keys of the argument values.
+     *
+     * @return
+     * The {@link QueryBuilder} instance.
+     */
+    public QueryBuilder filterByIndexEqualTo(String... keys) {
+        return filterByIndex("=", keys);
+    }
+
     /**
      * Appends one or more "like" filters.
      *

kilo-client/src/test/java/org/httprpc/kilo/sql/QueryBuilderTest.java

@@ -441,6 +441,14 @@ public void testLessThanOrEqualTo() {
         assertEquals(listOf("t"), getParameters(queryBuilder));
     }
 
+    @Test
+    public void testEqualTo() {
+        var queryBuilder = QueryBuilder.select(I.class).filterByIndexEqualTo("t", "u");
+
+        assertEquals("select I.h, I.i, I.t, I.u from I where I.t = ? and I.u = ?", queryBuilder.toString());
+        assertEquals(listOf("t", "u"), getParameters(queryBuilder));
+    }
+
     @Test
     public void testLike() {
         var queryBuilder = QueryBuilder.select(I.class).filterByIndexLike("t", "u");