#!/usr/bin/env bash CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd) . "$CURDIR"/../shell_config.sh set -e $CLICKHOUSE_CLIENT --query "DROP TABLE IF EXISTS test1"; $CLICKHOUSE_CLIENT --query "CREATE TABLE test1 (x UInt8) ENGINE = MergeTree ORDER BY tuple()"; function thread1() { while true; do $CLICKHOUSE_CLIENT --query "ALTER TABLE test1 MODIFY COLUMN x Nullable(UInt8)" $CLICKHOUSE_CLIENT --query "ALTER TABLE test1 MODIFY COLUMN x UInt8" done } function thread2() { while true; do $CLICKHOUSE_CLIENT --query "SELECT x FROM test1 WHERE x IN (SELECT x FROM remote('127.0.0.2', currentDatabase(), test1))" --format Null done } # https://stackoverflow.com/questions/9954794/execute-a-shell-function-with-timeout export -f thread1; export -f thread2; TIMEOUT=10 timeout $TIMEOUT bash -c thread1 2> /dev/null & timeout $TIMEOUT bash -c thread2 2> /dev/null & timeout $TIMEOUT bash -c thread1 2> /dev/null & timeout $TIMEOUT bash -c thread2 2> /dev/null & timeout $TIMEOUT bash -c thread1 2> /dev/null & timeout $TIMEOUT bash -c thread2 2> /dev/null & timeout $TIMEOUT bash -c thread1 2> /dev/null & timeout $TIMEOUT bash -c thread2 2> /dev/null & wait $CLICKHOUSE_CLIENT -q "DROP TABLE test1"