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trace.js
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trace.js
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if(typeof exports == "undefined"){
exports = this;
}
function processTrace(trace)
{
var jsonTrace = JSON.parse(trace);
var optSteps = null;
var selectno = null;
var output = "";
for (var i = 0; i < jsonTrace.steps.length; i++) {
if (jsonTrace.steps[i].join_optimization) {
selectno = jsonTrace.steps[i].join_optimization["select#"];
optSteps = jsonTrace.steps[i].join_optimization.steps;
output = processSelect(optSteps, selectno, output);
output += "\n";
}
}
return output;
}
function processSelect(optSteps, selectno, output)
{
var execPlans = null;
for (var i = 0; i < optSteps.length; i++) {
if (optSteps[i].join_optimization) { // Materialized derived table
derivedno = optSteps[i].join_optimization["select#"];
recursiveSteps = optSteps[i].join_optimization.steps;
output = processSelect(recursiveSteps, derivedno, output);
output += "\n";
}
if (optSteps[i].considered_execution_plans) {
execPlans = optSteps[i].considered_execution_plans;
break;
}
}
output += "select#" + selectno + ":\n";
if (!execPlans || execPlans == "...") {
output += "No trace for greedy search!\n";
return output;
}
output += "Table AccessType:IndexName Rows/Cost TotalRows/TotalCost\n";
output += "--------------------------------------------------------\n";
// List const tables first
for (var i = 0; i < execPlans[0].plan_prefix.length; i++)
output += "(" + execPlans[0].plan_prefix[i] + " const)\n";
for (var i=0; i < execPlans.length; i++) {
output = processTable(execPlans[i], output, 0);
}
return output;
}
function processTable(trace, output, indent)
{
if (!trace || !trace.table) return output;
// Do not include tables that failed the eq_ref extension test.
// They will show up later.
if ("added_to_eq_ref_extension" in trace) {
if (!trace.added_to_eq_ref_extension) return output;
}
// Indentation level for table
for (var i=0; i < indent; i++) output += " ";
output += trace.table;
// Find the chosen access path. TODO: Handle index merge etc.
if ("best_access_path" in trace) {
var accessPath = trace.best_access_path.considered_access_paths;
var best = null;
for (var i = 0; i < accessPath.length; i++) {
if (accessPath[i].chosen) best = accessPath[i];
}
}
if (best) {
output += " " + best.access_type;
switch (best.access_type) {
case "scan":
var rows = best.rows_to_scan; // 5.7
if (rows == undefined)
rows = best.rows; // 5.6
output += " " + rows + "/" + best.cost;
break;
case "eq_ref":
case "ref":
output += ":" + best.index;
output += " " + best.rows + "/" + best.cost;
break;
case "range":
if (best.range_details) { // 5.7
output += ":" + best.range_details.used_index;
output += " " + best.rows_to_scan + "/" + best.cost;
} else // 5.6
output += " " + best.rows + "/" + best.cost;
break;
default:
break;
}
}
output += " " + trace.rows_for_plan + '/' + trace.cost_for_plan;
if (trace.added_to_eq_ref_extension) output += " eq_ref-extended";
// Semi-join strategies
sj_strategy = trace.semijoin_strategy_choice;
if (sj_strategy) {
for (var i = 0; i < sj_strategy.length; i++) {
if (i == 0) output += " Semijoin(";
else output += " ";
switch (sj_strategy[i].strategy) {
case "FirstMatch":
output += "FM:";
break;
case "MaterializeLookup":
output += "ML:";
break;
case "MaterializeScan":
if (sj_strategy[i].choice == "deferred") continue;
output += "MS:";
break;
case "LooseScan":
// Cost for LooseScan is not traced unless it is chosen
if (!sj_strategy[i].chosen) continue;
output += "LS:";
break;
case "DuplicatesWeedout":
output += "DW:";
break;
}
output += sj_strategy[i].rows + "/" + sj_strategy[i].cost;
} // for-loop
if (sj_strategy.length > 0) output += ")";
} // if sj_strategy
if (trace.pruned_by_cost) {
output += " PRUNED(cost)\n";
} else if (trace.pruned_by_heuristic) {
output += " PRUNED(heuristic)\n";
} else if (trace.pruned_by_eq_ref_heuristic) {
output += " PRUNED(eq_ref_heuristic)\n";
} else if ("rest_of_plan" in trace) {
output += "\n";
var restOfPlan = trace.rest_of_plan;
for (var i = 0; i < restOfPlan.length; i++) {
output = processTable(restOfPlan[i], output, indent+2);
}
} else if (trace.chosen) {
if (trace.new_cost_for_plan) {
output += " Sort cost: " + trace.sort_cost;
output += " Total cost: " + trace.new_cost_for_plan;
}
output += " *** NEW BEST PLAN ***\n";
} else {
output += " REJECTED(cost)\n";
}
return output;
}
exports.processTrace = processTrace;