minor: Allow to run TPCH bench for a specific query

Author: comphead

benchmarks/bench.sh

@@ -43,7 +43,7 @@ usage() {
 Orchestrates running benchmarks against DataFusion checkouts
 
 Usage:
-$0 data [benchmark] [query_number]
+$0 data [benchmark] [query]
 $0 run [benchmark]
 $0 compare <branch1> <branch2>
 $0 venv
@@ -410,6 +410,7 @@ run_tpch() {
     RESULTS_FILE="${RESULTS_DIR}/tpch_sf${SCALE_FACTOR}.json"
     echo "RESULTS_FILE: ${RESULTS_FILE}"
     echo "Running tpch benchmark..."
+    # Optional query filter to run specific query
     QUERY=$([ -n "$ARG3" ] && echo "--query $ARG3" || echo "")
     $CARGO_COMMAND --bin tpch -- benchmark datafusion --iterations 5 --path "${TPCH_DIR}" --prefer_hash_join "${PREFER_HASH_JOIN}" --format parquet -o "${RESULTS_FILE}" $QUERY
 }