Function compute_digest_text

sql/sql_digest.cc:170–280

Iterate token array and updates digest_text. */

  Iterate token array and updates digest_text.
*/
void compute_digest_text(const sql_digest_storage* digest_storage,
                         String *digest_text)
{
  DBUG_ASSERT(digest_storage != NULL);
  uint byte_count= digest_storage->m_byte_count;
  String *digest_output= digest_text;
  uint tok= 0;
  uint current_byte= 0;
  lex_token_string *tok_data;

  /* Reset existing data */
  digest_output->length(0);

  if (byte_count > digest_storage->m_token_array_length)
  {
    digest_output->append('\0');
    return;
  }

  /* Convert text to utf8 */
  const CHARSET_INFO *from_cs= get_charset(digest_storage->m_charset_number, MYF(0));
  const CHARSET_INFO *to_cs= &my_charset_utf8mb3_bin;

  if (from_cs == NULL)
  {
    /*
      Can happen, as we do dirty reads on digest_storage,
      which can be written to in another thread.
    */
    digest_output->append('\0');
    return;
  }

  char id_buffer[NAME_LEN + 1]= {'\0'};
  char *id_string;
  size_t id_length;
  bool convert_text= !my_charset_same(from_cs, to_cs);

  while (current_byte < byte_count)
  {
    current_byte= read_token(digest_storage, current_byte, &tok);

    if (tok <= 0 || tok >= array_elements(lex_token_array)
        || current_byte > max_digest_length)
      return;

    tok_data= &lex_token_array[tok];

    switch (tok)
    {
    /* All identifiers are printed with their name. */
    case IDENT:
    case IDENT_QUOTED:
    case TOK_IDENT:
      {
        char *id_ptr= NULL;
        int id_len= 0;
        uint err_cs= 0;