From c0664b78cacb63f25954eb6b176eb127b7c19d45 Mon Sep 17 00:00:00 2001
From: aoiasd <45024769+aoiasd@users.noreply.github.com>
Date: Wed, 7 Jan 2026 11:53:24 +0800
Subject: [PATCH] fix: inverted index null offset file not compacted (#46775)

relate: https://github.com/milvus-io/milvus/issues/46774

Signed-off-by: aoiasd <zhicheng.yue@zilliz.com>
---
 internal/core/src/index/InvertedIndexTantivy.cpp | 10 ++++++++++
 internal/core/src/index/JsonInvertedIndex.cpp    |  4 ++++
 2 files changed, 14 insertions(+)

diff --git a/internal/core/src/index/InvertedIndexTantivy.cpp b/internal/core/src/index/InvertedIndexTantivy.cpp
index c1e99cf545..8f48b56845 100644
--- a/internal/core/src/index/InvertedIndexTantivy.cpp
+++ b/internal/core/src/index/InvertedIndexTantivy.cpp
@@ -255,7 +255,13 @@ InvertedIndexTantivy<T>::LoadIndexMetas(
         if (file_name.find(INDEX_NULL_OFFSET_FILE_NAME) != std::string::npos) {
             null_offset_files.push_back(file);
         }
+
+        // add slice meta file for null offset file compact
+        if (file_name == INDEX_FILE_SLICE_META) {
+            null_offset_files.push_back(file);
+        }
     }
+
     if (null_offset_files.size() > 0) {
         // null offset file is sliced
         auto index_datas = mem_file_manager_->LoadIndexToMemory(
@@ -283,6 +289,10 @@ InvertedIndexTantivy<T>::RetainTantivyIndexFiles(
                 auto file_name =
                     boost::filesystem::path(file).filename().string();
                 return file_name == "index_type" ||
+                       // Slice meta is only used to compact null_offset files and non_exist_offset files.
+                       // It can be removed after compaction is complete.
+                       // Other index files are compacted by slice index instead of meta.
+                       file_name == INDEX_FILE_SLICE_META ||
                        file_name.find(INDEX_NULL_OFFSET_FILE_NAME) !=
                            std::string::npos;
             }),
diff --git a/internal/core/src/index/JsonInvertedIndex.cpp b/internal/core/src/index/JsonInvertedIndex.cpp
index 5242e31be8..9044aace61 100644
--- a/internal/core/src/index/JsonInvertedIndex.cpp
+++ b/internal/core/src/index/JsonInvertedIndex.cpp
@@ -130,6 +130,10 @@ JsonInvertedIndex<T>::LoadIndexMetas(
             std::string::npos) {
             non_exist_offset_files.push_back(file);
         }
+        // add slice meta file for null offset file compact
+        if (file_name == INDEX_FILE_SLICE_META) {
+            non_exist_offset_files.push_back(file);
+        }
     }
     if (non_exist_offset_files.size() > 0) {
         // null offset file is sliced