refactor(instrumentation-mysql2): improve performance of getSpanName using substring (open-telemetry#2470)

Author: geotry

plugins/node/opentelemetry-instrumentation-mysql/src/utils.ts

@@ -112,10 +112,13 @@ export function getDbValues(
  * @returns SQL statement without variable arguments or SQL verb
  */
 export function getSpanName(query: string | Query | QueryOptions): string {
-  if (typeof query === 'object') {
-    return query.sql;
+  const rawQuery = typeof query === 'object' ? query.sql : query;
+  // Extract the SQL verb
+  const firstSpace = rawQuery?.indexOf(' ');
+  if (typeof firstSpace === 'number' && firstSpace !== -1) {
+    return rawQuery?.substring(0, firstSpace);
   }
-  return query.split(' ')[0];
+  return rawQuery;
 }
 
 export function arrayStringifyHelper(arr: Array<unknown> | undefined): string {

plugins/node/opentelemetry-instrumentation-mysql/test/index.test.ts

@@ -153,7 +153,7 @@ describe('[email protected]', () => {
 
         query.on('end', () => {
           const spans = memoryExporter.getFinishedSpans();
-          assert.strictEqual(spans[0].name, sql);
+          assert.strictEqual(spans[0].name, 'SELECT');
           done();
         });
       });

plugins/node/opentelemetry-instrumentation-mysql2/src/utils.ts

@@ -131,7 +131,11 @@ export function getDbStatement(
 export function getSpanName(query: string | Query | QueryOptions): string {
   const rawQuery = typeof query === 'object' ? query.sql : query;
   // Extract the SQL verb
-  return rawQuery?.split(' ')?.[0];
+  const firstSpace = rawQuery?.indexOf(' ');
+  if (typeof firstSpace === 'number' && firstSpace !== -1) {
+    return rawQuery?.substring(0, firstSpace);
+  }
+  return rawQuery;
 }
 
 export const once = (fn: Function) => {