Resetting all fields for all dims corrupts pivot cache

test case is exporting ooo55266-3 (contains data grouped in numerical
intervals) to xlsx and without closing the document, opening filter on
1st pivot table (kaboom!)

ClearGroupFields corrupts the cache bc it resets Field.mpGroup items
for all dimensions, not just the one present in ScDPDimensionSaveData
(all this happening in ScDPCollection::SheetCaches::getCache).
Consequently, accessing or rebuilding pivot cache may crash bc mpGroup
now points nowhere.

I split and renamed ScDPCache::ClearGroupFields into 2 parts, one of
them clears maGroupFields, the other resets mpGroup ptrs in maFields.
When adding data to cache, the former is used (bc group ptrs get reset
almost immediately afterwards)

Reviewed-on: https://gerrit.libreoffice.org/65329
Tested-by: Jenkins
Reviewed-by: Eike Rathke <erack@redhat.com>
Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>
(cherry picked from commit f70d29fd91d232f0b030f0f76bd23bd2919eb868)

Change-Id: I96e8d234a17da0f3cc65c0625aa47b12284b98b8
Reviewed-on: https://gerrit.libreoffice.org/66622
Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins

7 files changed, 52 insertions, 4 deletions

diff --git a/sc/inc/dpcache.hxx b/sc/inc/dpcache.hxx
index 8386c1d4b3f3..4a41bc3aff46 100644
--- a/sc/inc/dpcache.hxx
+++ b/sc/inc/dpcache.hxx
@@ -144,6 +144,7 @@ public:
     SCROW SetGroupItem(long nDim, const ScDPItemData& rData);
     void GetGroupDimMemberIds(long nDim, std::vector<SCROW>& rIds) const;
     void ClearGroupFields();
+    void ClearAllFields();
     const ScDPNumGroupInfo* GetNumGroupInfo(long nDim) const;
 
     /**
diff --git a/sc/qa/unit/data/ods/numgroup_example.ods b/sc/qa/unit/data/ods/numgroup_example.ods
new file mode 100644
index 000000000000..008e1bfd4970
--- /dev/null
+++ b/sc/qa/unit/data/ods/numgroup_example.ods
diff --git a/sc/qa/unit/helper/qahelper.cxx b/sc/qa/unit/helper/qahelper.cxx
index d414b1abfb96..809fdbf4bbd0 100644
--- a/sc/qa/unit/helper/qahelper.cxx
+++ b/sc/qa/unit/helper/qahelper.cxx
@@ -689,7 +689,7 @@ ScDocShellRef ScBootstrapFixture::saveAndReload( ScDocShell* pShell, sal_Int32 n
     return xDocSh;
 }
 
-std::shared_ptr<utl::TempFile> ScBootstrapFixture::exportTo( ScDocShell* pShell, sal_Int32 nFormat )
+std::shared_ptr<utl::TempFile> ScBootstrapFixture::saveAs( ScDocShell* pShell, sal_Int32 nFormat )
 {
     OUString aFilterName(aFileFormats[nFormat].pFilterName, strlen(aFileFormats[nFormat].pFilterName), RTL_TEXTENCODING_UTF8) ;
     OUString aFilterType(aFileFormats[nFormat].pTypeName, strlen(aFileFormats[nFormat].pTypeName), RTL_TEXTENCODING_UTF8);
@@ -708,8 +708,16 @@ std::shared_ptr<utl::TempFile> ScBootstrapFixture::exportTo( ScDocShell* pShell,
     pExportFilter.get()->SetVersion(SOFFICE_FILEFORMAT_CURRENT);
     aStoreMedium.SetFilter(pExportFilter);
     pShell->DoSaveAs( aStoreMedium );
+
+    return pTempFile;
+}
+
+std::shared_ptr<utl::TempFile> ScBootstrapFixture::exportTo( ScDocShell* pShell, sal_Int32 nFormat )
+{
+    std::shared_ptr<utl::TempFile> pTempFile = saveAs(pShell, nFormat);
     pShell->DoClose();
 
+    SfxFilterFlags nFormatType = aFileFormats[nFormat].nFormatType;
     if(nFormatType == XLSX_FORMAT_TYPE)
         validate(pTempFile->GetFileName(), test::OOXML);
     else if (nFormatType == ODS_FORMAT_TYPE)
diff --git a/sc/qa/unit/helper/qahelper.hxx b/sc/qa/unit/helper/qahelper.hxx
index f8d522e65387..c31569068a30 100644
--- a/sc/qa/unit/helper/qahelper.hxx
+++ b/sc/qa/unit/helper/qahelper.hxx
@@ -204,7 +204,8 @@ public:
 
     ScDocShellRef saveAndReload( ScDocShell* pShell, sal_Int32 nFormat );
 
-    static std::shared_ptr<utl::TempFile> exportTo( ScDocShell* pShell, sal_Int32 nFormat );
+    static std::shared_ptr<utl::TempFile> saveAs(ScDocShell* pShell, sal_Int32 nFormat);
+    static std::shared_ptr<utl::TempFile> exportTo(ScDocShell* pShell, sal_Int32 nFormat);
 
     void miscRowHeightsTest( TestParam const * aTestValues, unsigned int numElems );
 };
diff --git a/sc/qa/unit/subsequent_export-test.cxx b/sc/qa/unit/subsequent_export-test.cxx
index 2fb53a18ac3c..28f0782e5ad8 100644
--- a/sc/qa/unit/subsequent_export-test.cxx
+++ b/sc/qa/unit/subsequent_export-test.cxx
@@ -43,6 +43,8 @@
 #include <validat.hxx>
 #include <attrib.hxx>
 #include <global.hxx>
+#include <scmod.hxx>
+#include <dpcache.hxx>
 #include <dpobject.hxx>
 
 #include <svx/svdoole2.hxx>
@@ -211,6 +213,7 @@ public:
 
     void testTdf118990();
     void testTdf121612();
+    void testPivotCacheAfterExportXLSX();
 
     CPPUNIT_TEST_SUITE(ScExportTest);
     CPPUNIT_TEST(test);
@@ -322,6 +325,7 @@ public:
 
     CPPUNIT_TEST(testTdf118990);
     CPPUNIT_TEST(testTdf121612);
+    CPPUNIT_TEST(testPivotCacheAfterExportXLSX);
 
     CPPUNIT_TEST_SUITE_END();
 
@@ -4088,6 +4092,35 @@ void ScExportTest::testTdf121612()
     CPPUNIT_ASSERT_EQUAL(size_t(1), pDPColl->GetCount());
 }
 
+void ScExportTest::testPivotCacheAfterExportXLSX()
+{
+    ScDocShellRef xDocSh = loadDoc("numgroup_example.", FORMAT_ODS);
+    CPPUNIT_ASSERT(xDocSh.is());
+
+    // export only
+    std::shared_ptr<utl::TempFile> pTemp = ScBootstrapFixture::saveAs(xDocSh.get(), FORMAT_XLSX);
+
+    ScDocument& rDoc = xDocSh->GetDocument();
+    CPPUNIT_ASSERT(rDoc.HasPivotTable());
+
+    // Two pivot tables
+    ScDPCollection* pDPColl = rDoc.GetDPCollection();
+    CPPUNIT_ASSERT(pDPColl);
+    CPPUNIT_ASSERT_EQUAL(size_t(2), pDPColl->GetCount());
+
+    // One cache
+    ScDPCollection::SheetCaches& rSheetCaches = pDPColl->GetSheetCaches();
+    CPPUNIT_ASSERT_EQUAL(static_cast<size_t>(1), rSheetCaches.size());
+    const ScDPCache* pCache = rSheetCaches.getExistingCache(ScRange(0, 0, 0, 3, 30, 0));
+    CPPUNIT_ASSERT_MESSAGE("Pivot cache is expected for A1:D31 on the first sheet.", pCache);
+
+    // See if XLSX export didn't damage group info of the 1st pivot table
+    const ScDPNumGroupInfo* pInfo = pCache->GetNumGroupInfo(1);
+    CPPUNIT_ASSERT_MESSAGE("No number group info :(", pInfo);
+
+    xDocSh->DoClose();
+}
+
 CPPUNIT_TEST_SUITE_REGISTRATION(ScExportTest);
 
 CPPUNIT_PLUGIN_IMPLEMENT();
diff --git a/sc/source/core/data/dpcache.cxx b/sc/source/core/data/dpcache.cxx
index 6d8a1e12df6b..803c2c7d8b6e 100644
--- a/sc/source/core/data/dpcache.cxx
+++ b/sc/source/core/data/dpcache.cxx
@@ -1391,6 +1391,11 @@ struct ClearGroupItems
 void ScDPCache::ClearGroupFields()
 {
     maGroupFields.clear();
+}
+
+void ScDPCache::ClearAllFields()
+{
+    ClearGroupFields();
     std::for_each(maFields.begin(), maFields.end(), ClearGroupItems());
 }
 
diff --git a/sc/source/core/data/dpobject.cxx b/sc/source/core/data/dpobject.cxx
index eebe2f5f10ac..cb733d25a8da 100644
--- a/sc/source/core/data/dpobject.cxx
+++ b/sc/source/core/data/dpobject.cxx
@@ -3561,9 +3561,9 @@ bool ScDPCollection::ReloadGroupsInCache(const ScDPObject* pDPObj, std::set<ScDP
     if (!pCache)
         return false;
 
-    // Clear the existing group data from the cache, and rebuild it from the
+    // Clear the existing group/field data from the cache, and rebuild it from the
     // dimension data.
-    pCache->ClearGroupFields();
+    pCache->ClearAllFields();
     const ScDPDimensionSaveData* pDimData = pSaveData->GetExistingDimensionData();
     if (pDimData)
         pDimData->WriteToCache(*pCache);