diff --git a/src/PostgresDocumentStore.php b/src/PostgresDocumentStore.php
index d242afa..1e99cff 100644
--- a/src/PostgresDocumentStore.php
+++ b/src/PostgresDocumentStore.php
@@ -500,7 +500,7 @@ public function filterDocs(string $collectionName, Filter $filter, int $skip = n
     {
         [$filterStr, $args] = $this->filterToWhereClause($filter);
 
-        $where = $filterStr? "WHERE $filterStr" : '';
+        $where = $filterStr ? "WHERE $filterStr" : '';
 
         $offset = $skip !== null ? "OFFSET $skip" : '';
         $limit = $limit !== null ? "LIMIT $limit" : '';
@@ -524,6 +524,29 @@ public function filterDocs(string $collectionName, Filter $filter, int $skip = n
         }
     }
 
+    /**
+     * @param string $collectionName
+     * @param Filter $filter
+     * @return array
+     */
+    public function filterDocIds(string $collectionName, Filter $filter): array
+    {
+        [$filterStr, $args] = $this->filterToWhereClause($filter);
+
+        $where = $filterStr ? "WHERE {$filterStr}" : '';
+        $query = "SELECT id FROM {$this->schemaName($collectionName)}.{$this->tableName($collectionName)} {$where}";
+
+        $stmt = $this->connection->prepare($query);
+        $stmt->execute($args);
+
+        $docIds = [];
+        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+            $docIds[] = $row['id'];
+        }
+
+        return $docIds;
+    }
+
     private function transactional(callable $callback)
     {
         if($this->manageTransactions) {
diff --git a/tests/PostgresDocumentStoreTest.php b/tests/PostgresDocumentStoreTest.php
index a5dcf9c..a116447 100644
--- a/tests/PostgresDocumentStoreTest.php
+++ b/tests/PostgresDocumentStoreTest.php
@@ -16,8 +16,11 @@
 use EventEngine\DocumentStore\Filter\AnyOfFilter;
 use EventEngine\DocumentStore\Filter\DocIdFilter;
 use EventEngine\DocumentStore\Filter\EqFilter;
+use EventEngine\DocumentStore\Filter\GtFilter;
 use EventEngine\DocumentStore\Filter\InArrayFilter;
+use EventEngine\DocumentStore\Filter\LtFilter;
 use EventEngine\DocumentStore\Filter\NotFilter;
+use EventEngine\DocumentStore\Filter\OrFilter;
 use PHPUnit\Framework\TestCase;
 use EventEngine\DocumentStore\FieldIndex;
 use EventEngine\DocumentStore\Index;
@@ -434,6 +437,30 @@ public function it_handles_not_filter_nested_in_and_filter()
         $this->assertEquals([$thirdDocId], $refs);
     }
 
+    /**
+     * @test
+     */
+    public function it_retrieves_doc_ids_by_filter()
+    {
+        $collectionName = 'test_not_filter_nested_in_and_filter';
+        $this->documentStore->addCollection($collectionName);
+
+        $firstDocId = Uuid::uuid4()->toString();
+        $secondDocId = Uuid::uuid4()->toString();
+        $thirdDocId = Uuid::uuid4()->toString();
+
+        $this->documentStore->addDoc($collectionName, $firstDocId, ['number' => 10]);
+        $this->documentStore->addDoc($collectionName, $secondDocId, ['number' => 20]);
+        $this->documentStore->addDoc($collectionName, $thirdDocId, ['number' => 30]);
+
+        $result = $this->documentStore->filterDocIds($collectionName, new OrFilter(
+            new GtFilter('number', 21),
+            new LtFilter('number', 19)
+        ));
+
+        $this->assertEquals([$firstDocId, $thirdDocId], $result);
+    }
+
     private function getIndexes(string $collectionName): array
     {
         return TestUtil::getIndexes($this->connection, self::TABLE_PREFIX.$collectionName);