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CHAPTER 11 QUERY OPTIMIZATION
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NOTES This is a RECURSIVE method! RETURN VALUE Success = 0 Failed = 1 */ int Query_tree::prune_tree(query_node *prev, query_node *cur_node) { DBUG_ENTER("prune_tree"); if(cur_node != 0) { /* Blank Nodes are 1) projections without attributes that have at least 1 child, or 2) restrictions without expressions */ if((((cur_node->node_type == qntProject) && (cur_node->attributes->num_attributes() == 0)) || ((cur_node->node_type == qntRestrict) && (cur_node->where_expr->num_expressions() == 0))) && ((cur_node->left == 0) || (cur_node->right == 0))) { /* Redirect the pointers for the nodes above and below this node in the tree. */ if(prev == 0) { if(cur_node->left == 0) { cur_node->right->parent_nodeid = -1; root = cur_node->right; } else { cur_node->left->parent_nodeid = -1; root = cur_node->left; } my_free((gptr)cur_node, MYF(0)); cur_node = root; }
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else { if(prev->left == cur_node) { if(cur_node->left == 0) { prev->left = cur_node->right; if (cur_node->right != NULL) cur_node->right->parent_nodeid = prev->nodeid; } else { prev->left = cur_node->left; if (cur_node->left != NULL) cur_node->left->parent_nodeid = prev->nodeid; } my_free((gptr)cur_node, MYF(0)); cur_node = prev->left; } else { if(cur_node->left == 0) { prev->right = cur_node->right; if (cur_node->right != NULL) cur_node->right->parent_nodeid = prev->nodeid; } else { prev->right = cur_node->left; if (cur_node->left != NULL) cur_node->left->parent_nodeid = prev->nodeid; } my_free((gptr)cur_node, MYF(0)); cur_node = prev->right; } } prune_tree(prev, cur_node); } else { prune_tree(cur_node, cur_node->left); prune_tree(cur_node, cur_node->right); } } DBUG_RETURN(0); }
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If you haven t already done so, download the source code for this chapter and place the files in the /sql directory off the root of your source tree. Spend a few moments looking through the source code so that you are familiar with the methods. Taking the time to look through the code now will help should you need to debug the code to work with your configuration or if you want to add other enhancements or work the exercises. Once you have all of the source code files downloaded and have examined the code, you must add the files to your makefiles (in Linux) and project files (in Windows). See the sections Adding the Files to the Makefile on Linux and Adding the Files to the mysqld Project on Windows in 10 for the details on how to do this for your operating system. You will be adding the attribute and expression helper source files to your project. Once you have the files added to the project, compile the server and ensure there are no compilation errors.
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Once you have the new code installed and compiled, you can run the server and perform the tests. You can run the test you created earlier or you can enter the commands in a MySQL client utility. Listing 11-21 shows the expected output of running the commands listed in the test. Listing 11-21. Example Test Runs mysql> SELECT DBXP * FROM staff;
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+--------------------------+ | Execution Path | +--------------------------+ | expert_mysql.staff | | | | | | | | | | | V | | ------------------- | | | PROJECT | | | ------------------- | | | Access Method: | | | | iterator | | | ------------------- | | | | | | | | V | | Result Set | +--------------------------+ 15 rows in set (0.32 sec)
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CHAPTER 11 QUERY OPTIMIZATION
mysql> SELECT DBXP id FROM staff WHERE staff.id = '123456789'; +--------------------------+ | Execution Path | +--------------------------+ | expert_mysql.staff | | | | | | | | | | | V | | ------------------- | | | RESTRICT | | | ------------------- | | | Access Method: | | | | iterator | | | ------------------- | | | | | | | | | | | V | | ------------------- | | | PROJECT | | | ------------------- | | | Access Method: | | | | iterator | | | ------------------- | | | | | | | | V | | Result Set | +--------------------------+ 25 rows in set (0.09 sec)
mysql> SELECT DBXP id, dir_name FROM staff, directorate mysql> WHERE staff.dno = directorate.dnumber; +----------------------------------------------------+ | Execution Path | +----------------------------------------------------+ | expert_mysql.staff | | | | | | | | | | | V |
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