fix: query-do executeCount() fast path bypassed with filterGroups, join, distinct, etc.

The metadata-only fast path only checked filters.length === 0 but
skipped guards for filterGroups (OR filters), aggregates, groupBy,
distinct, join, vectorSearch, setOperation, subqueryIn, and
computedColumns. This returned wrong counts for any non-trivial query
that happened to have no AND filters.

Aligns with the same fix already applied to local-executor.ts count().

Author: teamchong

src/query-do.ts

@@ -697,7 +697,7 @@ export class QueryDO extends DurableObject<Env> {
 
   /** Core count logic shared by HTTP handler and RPC. */
   private async executeCount(query: QueryDescriptor): Promise<number> {
-    if (query.filters.length === 0) {
+    if (query.filters.length === 0 && !query.filterGroups?.length && !query.aggregates?.length && !query.groupBy?.length && !query.distinct && !query.join && !query.vectorSearch && !query.setOperation && !query.subqueryIn && !query.computedColumns?.length) {
       const meta = this.footerCache.get(query.table)
         ?? (await this.loadTableFromR2(query.table)) ?? undefined;
       if (meta) return meta.columns[0]?.pages.reduce((s, p) => s + p.rowCount, 0) ?? meta.totalRows;