bugfix: substr expr get wrong result length

2024-02-08 19:30:43 +00:00
parent 426469c057
commit 626c5536f9
3 changed files with 47 additions and 1 deletions
--- a/src/sql/engine/expr/ob_expr_substr.cpp
+++ b/src/sql/engine/expr/ob_expr_substr.cpp
@ -111,7 +111,7 @@ int ObExprSubstr::calc_result_length(ObExprResType *types_array,
            mbmaxlen = 1;
          }
          if (start_pos > 0 && substr_len > 0) {
-            if (start_pos + substr_len <= result_len + 1) {
+            if (start_pos <= INT64_MAX - substr_len && start_pos + substr_len <= result_len + 1) {
              if (is_oracle_mode) {
                res_len = substr_len * mbmaxlen;
              } else {