Fix clickhouse grep anchor in run-sql-bench.sh

Remove ^ anchor from clickhouse grep patterns to match targets
regardless of position in the comma-separated string, consistent
with the lance guard pattern.

Signed-off-by: fastio <pengjian.uestc@gmail.com>

Author: fastio

.github/scripts/run-sql-bench.sh

@@ -71,6 +71,13 @@ if $is_remote && echo "$targets" | grep -q 'lance'; then
     exit 1
 fi
 
+# ClickHouse on remote storage is not supported. clickhouse-local reads local files only.
+if $is_remote && echo "$targets" | grep -q 'clickhouse:'; then
+    echo "ERROR: ClickHouse benchmarks are not supported for remote storage."
+    echo "Remove 'clickhouse:' targets for benchmark '${benchmark_id:-unknown}'."
+    exit 1
+fi
+
 # Extract formats for each engine from the targets string.
 # Example input: "datafusion:parquet,datafusion:vortex,datafusion:lance,duckdb:parquet"
 #
@@ -84,7 +91,7 @@ fi
 df_formats=$(echo "$targets" | tr ',' '\n' | (grep '^datafusion:' | grep -v ':lance$' || true) | sed 's/datafusion://' | tr '\n' ',' | sed 's/,$//')
 ddb_formats=$(echo "$targets" | tr ',' '\n' | (grep '^duckdb:' || true) | sed 's/duckdb://' | tr '\n' ',' | sed 's/,$//')
 has_lance=$(echo "$targets" | grep -q 'datafusion:lance' && echo "true" || echo "false")
-has_clickhouse=$(echo "$targets" | grep -q '^clickhouse:' && echo "true" || echo "false")
+has_clickhouse=$(echo "$targets" | grep -q 'clickhouse:' && echo "true" || echo "false")
 
 # Build options string.
 opts=""