add clickbench dataset

Author: friendlymatthew

.gitignore

@@ -1 +1,2 @@
 /target
+hits.csv

download_clickbench.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -e
+
+echo "downloading..."
+curl -L -o hits.csv.gz "https://datasets.clickhouse.com/hits_compatible/hits.csv.gz"
+
+echo "decompressing..."
+gunzip hits.csv.gz
+
+echo "done: hits.csv"