Improve performance of compare view using Promise.all

Author: koesie10

extensions/ql-vscode/src/compare/compare-view.ts

@@ -66,12 +66,12 @@ export class CompareView extends AbstractWebview<
     to: CompletedLocalQueryInfo,
     selectedResultSetName?: string,
   ) {
-    const fromSchemas = await this.cliServer.bqrsInfo(
-      from.completedQuery.query.resultsPaths.resultsPath,
-    );
-    const toSchemas = await this.cliServer.bqrsInfo(
-      to.completedQuery.query.resultsPaths.resultsPath,
-    );
+    const [fromSchemas, toSchemas] = await Promise.all([
+      this.cliServer.bqrsInfo(
+        from.completedQuery.query.resultsPaths.resultsPath,
+      ),
+      this.cliServer.bqrsInfo(to.completedQuery.query.resultsPaths.resultsPath),
+    ]);
 
     const [fromSchemaNames, toSchemaNames] = await Promise.all([
       getResultSetNames(
@@ -293,16 +293,18 @@ export class CompareView extends AbstractWebview<
     fromResultSetName: string,
     toResultSetName: string,
   ): Promise<RawQueryCompareResult> {
-    const fromResultSet = await this.getResultSet(
-      fromInfo.schemas,
-      fromResultSetName,
-      from.completedQuery.query.resultsPaths.resultsPath,
-    );
-    const toResultSet = await this.getResultSet(
-      toInfo.schemas,
-      toResultSetName,
-      to.completedQuery.query.resultsPaths.resultsPath,
-    );
+    const [fromResultSet, toResultSet] = await Promise.all([
+      this.getResultSet(
+        fromInfo.schemas,
+        fromResultSetName,
+        from.completedQuery.query.resultsPaths.resultsPath,
+      ),
+      this.getResultSet(
+        toInfo.schemas,
+        toResultSetName,
+        to.completedQuery.query.resultsPaths.resultsPath,
+      ),
+    ]);
 
     // Only compare columns that have the same name
     return resultsDiff(fromResultSet, toResultSet);

extensions/ql-vscode/src/compare/interpreted-results.ts

@@ -25,20 +25,6 @@ export async function compareInterpretedResults(
   fromQuery: CompletedLocalQueryInfo,
   toQuery: CompletedLocalQueryInfo,
 ): Promise<InterpretedQueryCompareResult> {
-  const fromResultSet = await getInterpretedResults(
-    fromQuery.completedQuery.query.resultsPaths.interpretedResultsPath,
-  );
-
-  const toResultSet = await getInterpretedResults(
-    toQuery.completedQuery.query.resultsPaths.interpretedResultsPath,
-  );
-
-  if (!fromResultSet || !toResultSet) {
-    throw new Error(
-      "Could not find interpreted results for one or both queries.",
-    );
-  }
-
   const database = databaseManager.findDatabaseItem(
     Uri.parse(toQuery.initialInfo.databaseInfo.databaseUri),
   );
@@ -48,9 +34,21 @@ export async function compareInterpretedResults(
     );
   }
 
-  const sourceLocationPrefix = await database.getSourceLocationPrefix(
-    cliServer,
-  );
+  const [fromResultSet, toResultSet, sourceLocationPrefix] = await Promise.all([
+    getInterpretedResults(
+      fromQuery.completedQuery.query.resultsPaths.interpretedResultsPath,
+    ),
+    getInterpretedResults(
+      toQuery.completedQuery.query.resultsPaths.interpretedResultsPath,
+    ),
+    database.getSourceLocationPrefix(cliServer),
+  ]);
+
+  if (!fromResultSet || !toResultSet) {
+    throw new Error(
+      "Could not find interpreted results for one or both queries.",
+    );
+  }
 
   const fromResults = fromResultSet.runs[0].results;
   const toResults = toResultSet.runs[0].results;