Fix prepare stmt error 4016

deps/oblib/src/lib/number/ob_number_v2.cpp

@@ -3539,10 +3539,14 @@ int ObNumber::to_sci_str_(ObString &num_str, char *buf,
           }
           buf[digit_start_pos] = '1';
           buf[digit_start_pos + 1] = '.';
+          if ('-' == pow_str[1]) {
+            --pow_size;
+          } else {
             ++pow_size;
           }
         }
       }
+    }
     // fill exponent part
     if (OB_SUCC(ret)) {
       if (OB_FAIL(databuff_printf(pow_str, sizeof(pow_str), pow_pos, "%ld", pow_size))) {

src/sql/engine/expr/ob_number_format_models.cpp

@@ -1696,10 +1696,14 @@ int ObNFMBase::num_str_to_sci(const common::ObString &num_str, const int32_t sca
           if (decimal_appear) {
             buf[digit_start_pos + 1] = '.';
           }
+          if ('-' == pow_str[1]) {
+            --pow_size;
+          } else {
             ++pow_size;
           }
         }
       }
+    }
     if (OB_SUCC(ret) && is_tm) {
       int32_t offset = 0;
       // 1.0000000000000000000000000000000000E+65 --> 1E+65

src/sql/resolver/prepare/ob_prepare_resolver.cpp

@@ -54,7 +54,7 @@ int ObPrepareResolver::resolve(const ParseNode &parse_tree)
         prepare_stmt->set_prepare_sql(stmt_expr);
       }
     } else {
-      ret = OB_ERR_UNEXPECTED;
+      ret = OB_ERR_PARSER_SYNTAX;
       LOG_WARN("invalid name node", K(name_node->type_), K(ret));
     }
   }