Method check

sql/table.cc:5553–5742

*/

bool
Table_check_intact::check(TABLE *table, const TABLE_FIELD_DEF *table_def)
{
  uint i;
  my_bool error= FALSE;
  const TABLE_FIELD_TYPE *field_def= table_def->field;
  DBUG_ENTER("table_check_intact");
  DBUG_PRINT("info",("table: %s  expected_count: %d",
                     table->alias.c_ptr(), table_def->count));

  /* Whether the table definition has already been validated. */
  if (table->s->table_field_def_cache == table_def)
    goto end;

  if (table->s->fields != table_def->count)
  {
    THD *thd= current_thd;
    DBUG_PRINT("info", ("Column count has changed, checking the definition"));

    /* previous MySQL version */
    if (MYSQL_VERSION_ID > table->s->mysql_version)
    {
      report_error(ER_COL_COUNT_DOESNT_MATCH_PLEASE_UPDATE,
                   ER_THD(thd, ER_COL_COUNT_DOESNT_MATCH_PLEASE_UPDATE),
                   table->alias.c_ptr(), table_def->count, table->s->fields,
                   static_cast<int>(table->s->mysql_version),
                   MYSQL_VERSION_ID);
      DBUG_RETURN(TRUE);
    }
    else if (MYSQL_VERSION_ID == table->s->mysql_version)
    {
      report_error(ER_COL_COUNT_DOESNT_MATCH_CORRUPTED_V2,
                   ER_THD(thd, ER_COL_COUNT_DOESNT_MATCH_CORRUPTED_V2),
                   table->s->db.str, table->s->table_name.str,
                   table_def->count, table->s->fields);
      DBUG_RETURN(TRUE);
    }
    /*
      Something has definitely changed, but we're running an older
      version of MySQL with new system tables.
      Let's check column definitions. If a column was added at
      the end of the table, then we don't care much since such change
      is backward compatible.
    */
  }
  else
  {
  StringBuffer<1024> sql_type(system_charset_info);
  sql_type.extra_allocation(256); // Allocate min 256 characters at once
  for (i=0 ; i < table_def->count; i++, field_def++)
  {
    sql_type.length(0);
    if (i < table->s->fields)
    {
      Field *field= table->field[i];

      if (strncmp(field->field_name.str, field_def->name.str,
                  field_def->name.length))