statsitstics: avoid sync load column which is skiped to analyze

Signed-off-by: Weizhen Wang <wangweizhen@pingcap.com>

pkg/statistics/handle/syncload/stats_syncload.go

@@ -300,6 +300,8 @@ func (s *statsSyncLoad) handleOneItemTask(task *statstypes.NeededItemTask) (err
 			s.statsHandle.SPool().Put(se)
 		}
 	}()
+
+	skipTypes := sctx.GetSessionVars().AnalyzeSkipColumnTypes
 	item := task.Item.TableItemID
 	tbl, ok := s.statsHandle.Get(item.TableID)
 
@@ -335,6 +337,10 @@ func (s *statsSyncLoad) handleOneItemTask(task *statstypes.NeededItemTask) (err
 			// so we have to get the column info from the domain.
 			wrapper.colInfo = tblInfo.Meta().GetColumnByID(item.ID)
 		}
+		_, skip := skipTypes[types.TypeToStr(col.Info.FieldType.GetType(), col.Info.FieldType.GetCharset())]
+		if skip {
+			return nil
+		}
 		// If this column is not analyzed yet and we don't have it in memory.
 		// We create a fake one for the pseudo estimation.
 		if loadNeeded && !analyzed {
@@ -348,6 +354,7 @@ func (s *statsSyncLoad) handleOneItemTask(task *statstypes.NeededItemTask) (err
 			return nil
 		}
 	}
+	failpoint.Inject("handleOneItemTaskPanic", nil)
 	t := time.Now()
 	needUpdate := false
 	wrapper, err = s.readStatsForOneItem(sctx, item, wrapper, isPkIsHandle, task.Item.FullLoad)

pkg/statistics/handle/syncload/stats_syncload_test.go

@@ -55,6 +55,22 @@ func TestSyncLoadSkipUnAnalyzedItems(t *testing.T) {
 	failpoint.Disable("github.com/pingcap/tidb/pkg/statistics/handle/syncload/assertSyncLoadItems")
 }
 
+func TestSyncLoadSkipAnalyzSkipColumnItems(t *testing.T) {
+	store, dom := testkit.CreateMockStoreAndDomain(t)
+	tk := testkit.NewTestKit(t, store)
+	tk.MustExec("use test")
+	tk.MustExec("drop table if exists t")
+	tk.MustExec("create table t(`id` bigint(20) NOT NULL AUTO_INCREMENT,content text,PRIMARY KEY (`id`))")
+	h := dom.StatsHandle()
+	h.SetLease(1)
+
+	tk.MustExec("analyze table t")
+	tk.MustExec("set @@session.tidb_analyze_skip_column_types = 'json, text, blob'") // text is not default.
+	require.NoError(t, failpoint.Enable("github.com/pingcap/tidb/pkg/statistics/handle/syncload/handleOneItemTaskPanic", `panic`))
+	tk.MustQuery("trace plan select * from t where content ='ab'")
+	require.NoError(t, failpoint.Disable("github.com/pingcap/tidb/pkg/statistics/handle/syncload/handleOneItemTaskPanic"))
+}
+
 func TestConcurrentLoadHist(t *testing.T) {
 	store, dom := testkit.CreateMockStoreAndDomain(t)