fix upper expression return empty string in oracle mode bug

2023-02-06 23:38:08 +08:00
parent 2e48b19c40
commit 537d3af901
3 changed files with 31 additions and 1 deletions
--- a/src/sql/engine/expr/ob_expr_lower.cpp
+++ b/src/sql/engine/expr/ob_expr_lower.cpp
@ -446,7 +446,12 @@ int ObExprLowerUpper::calc_common(const ObExpr &expr, ObEvalCtx &ctx,
      }
    }
    if (OB_SUCC(ret)) {
-      expr_datum.set_string(str_result);
+      if (OB_UNLIKELY(is_oracle_mode() && str_result.length() == 0
+                      && ob_is_string_tc(expr.datum_meta_.type_))) {
+        expr_datum.set_null();
+      } else {
+        expr_datum.set_string(str_result);
+      }
    }
  }
  return ret;