diff --git a/ddl/export_test.go b/ddl/export_test.go
index 8d06495f5a070..633c28c8a9de6 100644
--- a/ddl/export_test.go
+++ b/ddl/export_test.go
@@ -60,9 +60,8 @@ func FetchChunk4Test(copCtx *copContext, tbl table.PhysicalTable, startKey, endK
 }
 
 func ConvertRowToHandleAndIndexDatum(row chunk.Row, copCtx *copContext) (kv.Handle, []types.Datum, error) {
-	sVars := copCtx.sessCtx.GetSessionVars()
-	idxData := extractDatumByOffsets(row, copCtx.idxColOutputOffsets, copCtx.expColInfos, sVars, nil)
-	handleData := extractDatumByOffsets(row, copCtx.handleOutputOffsets, copCtx.expColInfos, sVars, nil)
+	idxData := extractDatumByOffsets(row, copCtx.idxColOutputOffsets, copCtx.expColInfos, nil)
+	handleData := extractDatumByOffsets(row, copCtx.handleOutputOffsets, copCtx.expColInfos, nil)
 	handle, err := buildHandle(handleData, copCtx.tblInfo, copCtx.pkInfo, &stmtctx.StatementContext{TimeZone: time.Local})
 	return handle, idxData, err
 }
diff --git a/ddl/index.go b/ddl/index.go
index 46e9cc8dd6073..2d3b2ef5cd9c4 100644
--- a/ddl/index.go
+++ b/ddl/index.go
@@ -1679,8 +1679,8 @@ func writeChunkToLocal(writer ingest.Writer,
 	defer unlock()
 	for row := iter.Begin(); row != iter.End(); row = iter.Next() {
 		idxDataBuf, handleDataBuf = idxDataBuf[:0], handleDataBuf[:0]
-		idxDataBuf = extractDatumByOffsets(row, copCtx.idxColOutputOffsets, copCtx.expColInfos, vars, idxDataBuf)
-		handleDataBuf := extractDatumByOffsets(row, copCtx.handleOutputOffsets, copCtx.expColInfos, vars, handleDataBuf)
+		idxDataBuf = extractDatumByOffsets(row, copCtx.idxColOutputOffsets, copCtx.expColInfos, idxDataBuf)
+		handleDataBuf := extractDatumByOffsets(row, copCtx.handleOutputOffsets, copCtx.expColInfos, handleDataBuf)
 		handle, err := buildHandle(handleDataBuf, copCtx.tblInfo, copCtx.pkInfo, sCtx)
 		if err != nil {
 			return 0, nil, errors.Trace(err)
diff --git a/ddl/index_cop.go b/ddl/index_cop.go
index a1d20abf3ab94..88dabda331951 100644
--- a/ddl/index_cop.go
+++ b/ddl/index_cop.go
@@ -510,7 +510,6 @@ func extractDatumByOffsets(
 	row chunk.Row,
 	offsets []int,
 	expCols []*expression.Column,
-	vars *variable.SessionVars,
 	buf []types.Datum,
 ) []types.Datum {
 	for _, offset := range offsets {