fix create view bug with prefix index

src/sql/resolver/dml/ob_dml_resolver.cpp

@@ -6004,7 +6004,7 @@ int ObDMLResolver::deduce_generated_exprs(ObIArray<ObRawExpr*>& exprs)
 {
   int ret = OB_SUCCESS;
   ObSEArray<ObRawExpr*, 8> generate_exprs;
-  for (int64_t i = 0; OB_SUCC(ret) && i < exprs.count(); ++i) {
+  for (int64_t i = 0; OB_SUCC(ret) && !params_.is_from_create_view_ && i < exprs.count(); ++i) {
     ObRawExpr* expr = exprs.at(i);
     if (OB_ISNULL(expr)) {
       ret = OB_ERR_UNEXPECTED;

src/sql/resolver/expr/ob_raw_expr_util.cpp

@@ -1939,6 +1939,7 @@ int ObRawExprUtils::create_substr_expr(ObRawExprFactory& expr_factory, ObSQLSess
     ret = OB_ERR_UNEXPECTED;
     LOG_WARN("to_type is null");
   } else {
+    out_expr->set_func_name(N_SUBSTR);
     if (NULL == third_expr) {
       if (OB_FAIL(out_expr->set_param_exprs(first_expr, second_expr))) {
         LOG_WARN("add param expr failed", K(ret));