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DESCRIPTION This method is used to get the next READ_RECORD from the pipeline. The idea is to call prepare() after you've validated the query then call get_next to get the first tuple in the pipeline. RETURN VALUE Success = next tuple in the result set Failed = NULL */ READ_RECORD *Query_tree::get_next(query_node *qn) { READ_RECORD *next_tup = NULL; int i = 0; DBUG_ENTER("get_next"); /* For each of the possible node types, perform the query operation by calling the method for the operation. These implement a very high-level abstraction of the operation. The real work is left to the methods. */ switch (qn->node_type) { /* placeholder for exercises... */ case Query_tree::qntDistinct : break; /* placeholder for exercises... */ case Query_tree::qntUndefined : break; /* placeholder for exercises... */ case Query_tree::qntSort : if (qn->preempt_pipeline) qn->preempt_pipeline = false; break; /* For restrict, get a row (tuple) from the table and call the do_restrict method looping until a row is returned (data matches conditions), then return result to main loop in DBXP_select_command. */
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case Query_tree::qntRestrict : do { /* if there is a child, get row from child */ if (qn->left != NULL) next_tup = get_next(qn->left); /* else get the row from the table stored in this node */ else { /* create space for the record buffer */ if (next_tup == NULL) next_tup = (READ_RECORD *) my_malloc(sizeof(READ_RECORD), MYF(MY_ZEROFILL | MY_WME)); next_tup->rec_buf = (byte *) my_malloc(qn->relations[0]->table->s->rec_buff_length, MYF(MY_ZEROFILL | MY_WME)); /* read row from table (storage handler */ qn->eof[0] = qn->relations[0]->table->file->rnd_next(next_tup->rec_buf); /* check for end of file */ if (qn->eof[0] != HA_ERR_END_OF_FILE) qn->eof[0] = false; else { qn->eof[0] = true; next_tup = NULL; } } /* if there is a row, call the do_restrict method */ if (next_tup) if(!do_restrict(qn, next_tup)) { /* if no row to return, free memory used */ my_free((gptr)next_tup->rec_buf, MYF(0)); my_free((gptr)next_tup, MYF(0)); next_tup = NULL; } } while ((next_tup == NULL) && !Eof(qn)); break; /* For project, get a row (tuple) from the table and call the do_project method. If successful, return result to main loop in DBXP_select_command. */
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case Query_tree::qntProject : /* if there is a child, get row from child */ if (qn->left != NULL) { next_tup = get_next(qn->left); if (next_tup) if (!do_project(qn, next_tup)) { /* if no row to return, free memory used */ my_free((gptr)next_tup->rec_buf, MYF(0)); my_free((gptr)next_tup, MYF(0)); next_tup = NULL; } } /* else get the row from the table stored in this node */ else { /* create space for the record buffer */ if (next_tup == NULL) next_tup = (READ_RECORD *) my_malloc(sizeof(READ_RECORD), MYF(MY_ZEROFILL | MY_WME)); next_tup->rec_buf = (byte *)my_malloc(qn->relations[0]->table->s->rec_buff_length + 20, MYF(MY_ZEROFILL | MY_WME)); /* read row from table (storage handler */ qn->eof[0] = qn->relations[0]->table->file->rnd_next(next_tup->rec_buf); /* check for end of file */ if (qn->eof[0] != HA_ERR_END_OF_FILE) qn->eof[0] = false; else { qn->eof[0] = true; next_tup = NULL; } /* if there is a row, call the do_project method */ if (next_tup) if (!do_project(qn, next_tup)) { /* no row to return, free memory used */ my_free((gptr)next_tup->rec_buf, MYF(0)); my_free((gptr)next_tup, MYF(0));
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next_tup = NULL; } } break; /* For join, loop until either a row is returned from the do_join method or we are at end of file for both tables. If successful (data matches conditions), return result to main loop in DBXP_select_command. */ case Query_tree::qntJoin : do { if (next_tup) { /* if no row to return, free memory used */ my_free((gptr)next_tup->rec_buf, MYF(0)); my_free((gptr)next_tup, MYF(0)); next_tup = NULL; } next_tup = do_join(qn); } while ((next_tup == NULL) && !Eof(qn)); break; } DBUG_RETURN(next_tup); } The send_data() Method The send_data() method is a helper router that writes data to the client using the MySQL Protocol class to handle the communication chores. This method was borrowed from the MySQL source code and rewritten slightly to accommodate the (relative) simplistic execution of the DBXP execution engine. In this case, the Item superclass is used to send the field values to the client using the item->send() method. Listing 12-25 shows the code for the send_data() method. Listing 12-25. The send_data() Method /* Send data SYNOPSIS send_data() Protocol *p IN the Protocol class THD *thd IN the current thread List<Item> *items IN the list of fields identified in the row
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