databaseRunQueries(): add optimizeForLastQueryRun parameter

src/analyze.ts

@@ -392,7 +392,8 @@ export async function runQueries(
       databasePath,
       searchPath,
       querySuitePath,
-      queryFlags
+      queryFlags,
+      false
     );
 
     logger.debug(`BQRS results produced for ${language} (queries: ${type})"`);
@@ -424,7 +425,8 @@ export async function runQueries(
       databasePath,
       undefined,
       querySuitePath,
-      queryFlags
+      queryFlags,
+      false
     );
 
     return querySuitePath;

src/codeql.ts

@@ -148,12 +148,19 @@ export interface CodeQL {
   ): Promise<void>;
   /**
    * Run 'codeql database run-queries'.
+   *
+   * @param optimizeForLastQueryRun Whether to apply additional optimization for
+   *                                the last database query run in the action.
+   *                                It is always safe to set it to false.
+   *                                It should be set to true only for the very
+   *                                last databaseRunQueries() call.
    */
   databaseRunQueries(
     databasePath: string,
     extraSearchPath: string | undefined,
     querySuitePath: string | undefined,
-    flags: string[]
+    flags: string[],
+    optimizeForLastQueryRun: boolean
   ): Promise<void>;
   /**
    * Run 'codeql database interpret-results'.
@@ -788,7 +795,8 @@ export async function getCodeQLForCmd(
       databasePath: string,
       extraSearchPath: string | undefined,
       querySuitePath: string | undefined,
-      flags: string[]
+      flags: string[],
+      optimizeForLastQueryRun: boolean
     ): Promise<void> {
       const codeqlArgs = [
         "database",
@@ -799,6 +807,12 @@ export async function getCodeQLForCmd(
         "-v",
         ...getExtraOptionsFromEnv(["database", "run-queries"]),
       ];
+      if (
+        optimizeForLastQueryRun &&
+        (await util.supportExpectDiscardedCache(this))
+      ) {
+        codeqlArgs.push("--expect-discarded-cache");
+      }
       if (extraSearchPath !== undefined) {
         codeqlArgs.push("--additional-packs", extraSearchPath);
       }

src/util.ts

@@ -571,6 +571,15 @@ export function isGoodVersion(versionSpec: string) {
   return !BROKEN_VERSIONS.includes(versionSpec);
 }
 
+/**
+ * Checks whether the CodeQL CLI supports the `--expect-discarded-cache` command-line flag.
+ */
+export async function supportExpectDiscardedCache(
+  codeQL: CodeQL
+): Promise<boolean> {
+  return codeQlVersionAbove(codeQL, "2.12.1");
+}
+
 export const ML_POWERED_JS_QUERIES_PACK_NAME =
   "codeql/javascript-experimental-atm-queries";