rename_table.sh

export PGHOST=...
export PGUSER=citus
export PGPASSWORD=...
export PGSSLMODE=require
export PGDATABASE=citus
export TABLE_NAME=events
export NEW_TABLE_NAME=events_backup
export PARALLEL_FACTOR=4

psql -tA -F" " -c "SELECT s.shardid, \
nodename, nodeport FROM pg_dist_shard s JOIN pg_dist_shard_placement p ON (s.shardid = p.shardid) \
WHERE logicalrelid::regclass = '$TABLE_NAME'::regclass;" |
xargs -n 3 -P $PARALLEL_FACTOR sh -c "psql -h \$1 -p \$2 -c \"ALTER TABLE ${TABLE_NAME}_\$0 RENAME TO ${NEW_TABLE_NAME}_\$0\""

export PGOPTIONS="-c citus.enable_ddl_propagation=off"
psql -c "ALTER TABLE $TABLE_NAME RENAME to $NEW_TABLE_NAME"