Function prepare_blob_field

sql/sql_table.cc:1611–1650

*/

static bool prepare_blob_field(THD *thd, Create_field *sql_field)
{
  DBUG_ENTER("prepare_blob_field");

  if (sql_field->length > MAX_FIELD_VARCHARLENGTH &&
      !(sql_field->flags & BLOB_FLAG))
  {
    /* Convert long VARCHAR columns to TEXT or BLOB */
    char warn_buff[MYSQL_ERRMSG_SIZE];

    if (sql_field->def || thd->is_strict_mode())
    {
      my_error(ER_TOO_BIG_FIELDLENGTH, MYF(0), sql_field->field_name,
               static_cast<ulong>(MAX_FIELD_VARCHARLENGTH /
                                  sql_field->charset->mbmaxlen));
      DBUG_RETURN(1);
    }
    sql_field->sql_type= MYSQL_TYPE_BLOB;
    sql_field->flags|= BLOB_FLAG;
    my_snprintf(warn_buff, sizeof(warn_buff), ER(ER_AUTO_CONVERT), sql_field->field_name,
            (sql_field->charset == &my_charset_bin) ? "VARBINARY" : "VARCHAR",
            (sql_field->charset == &my_charset_bin) ? "BLOB" : "TEXT");
    push_warning(thd, Sql_condition::WARN_LEVEL_NOTE, ER_AUTO_CONVERT,
                 warn_buff);
  }

  if ((sql_field->flags & BLOB_FLAG) && sql_field->length)
  {
    if (sql_field->sql_type == FIELD_TYPE_BLOB ||
        sql_field->sql_type == FIELD_TYPE_TINY_BLOB ||
        sql_field->sql_type == FIELD_TYPE_MEDIUM_BLOB)
    {
      /* The user has given a length to the blob column */
      sql_field->sql_type= get_blob_type_from_length(sql_field->length);
      sql_field->pack_length= calc_pack_length(sql_field->sql_type, 0);
    }
    sql_field->length= 0;
  }
  DBUG_RETURN(0);
}


/*