Method add_json_table_fields

sql/json_table.cc:794–872

*/

bool Create_json_table::add_json_table_fields(THD *thd, TABLE *table,
                                              Table_function_json_table *jt)
{
  TABLE_SHARE *share= table->s;
  Json_table_column *jc;
  uint fieldnr= 0;
  MEM_ROOT *mem_root_save= thd->mem_root;
  List_iterator_fast<Json_table_column> jc_i(jt->m_columns);
  Column_derived_attributes da(&my_charset_utf8mb4_general_ci);
  DBUG_ENTER("add_json_table_fields");

  thd->mem_root= &table->mem_root;
  current_counter= other;
  
  while ((jc= jc_i++))
  {
    Create_field *sql_f= jc->m_field;
    List_iterator_fast<Json_table_column> it2(jt->m_columns);
    Json_table_column *jc2;
     /*
       Initialize length from its original value (number of characters),
       which was set in the parser. This is necessary if we're
       executing a prepared statement for the second time.
    */
    sql_f->length= sql_f->char_length;

    if (sql_f->prepare_stage1(thd, thd->mem_root,
                              COLUMN_DEFINITION_TABLE_FIELD,
                              &da))
      goto err_exit;

    while ((jc2= it2++) != jc)
    {
      if (sql_f->field_name.streq(jc2->m_field->field_name))
      {
        my_error(ER_DUP_FIELDNAME, MYF(0), sql_f->field_name.str);
        goto err_exit;
      }
    }
    it2.rewind();
  }

  jc_i.rewind();

  while ((jc= jc_i++))
  {
    Create_field *sql_f= jc->m_field;
    Record_addr addr(!(sql_f->flags & NOT_NULL_FLAG));
    Bit_addr bit(addr.null());
    uint uneven_delta;

    sql_f->prepare_stage2(table->file, table->file->ha_table_flags());

    if (!sql_f->charset)
      sql_f->charset= &my_charset_utf8mb4_bin;

    Field *f= sql_f->type_handler()->make_table_field_from_def(share,
        thd->mem_root, &sql_f->field_name, addr, bit, sql_f, sql_f->flags);