Merge pull request #309 from somratdutta/patch-1

Refactor `postgresql/benchmark.sh` to Wrap COPY FREEZE in a Transaction Block

Author: rschu1ze

postgresql/benchmark.sh

@@ -10,7 +10,17 @@ chmod 777 ~ hits.tsv
 
 sudo -u postgres psql -t -c 'CREATE DATABASE test'
 sudo -u postgres psql test -t < create.sql
-sudo -u postgres psql test -t -c '\timing' -c "\\copy hits FROM 'hits.tsv' with freeze"
+
+# Load data: wrap TRUNCATE and \copy FREEZE in a single transaction
+# If we dont' do this, Postgres will throw an error:
+#     "ERROR: cannot perform COPY FREEZE because the table was not created or truncated in the current subtransaction"
+# (i.e. Postgres requires that the table be either created or truncated in the current subtransaction)
+sudo -u postgres psql test <<'EOF'
+BEGIN;
+TRUNCATE TABLE hits;
+\copy hits FROM 'hits.tsv' with freeze;
+COMMIT;
+EOF
 
 sudo -u postgres psql test -t -c 'VACUUM ANALYZE hits'