ClickHouse/tests/queries/0_stateless/01249_flush_interactive.sh

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#!/usr/bin/env bash
CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
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# shellcheck source=../shell_config.sh
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. "$CURDIR"/../shell_config.sh
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# A question for curious reader:
# How to break shell pipeline as soon as 5 lines are found in the following command:
# ./my-program | head -n5
# When I tried to do it, pipeline was not actively terminated,
# unless the my-program will try to output a thousand more lines overflowing pipe buffer and terminating with Broken Pipe.
# But if my program just output 5 (or slightly more) lines and hang up, the pipeline is not terminated.
function test()
{
timeout 5 ${CLICKHOUSE_LOCAL} --max_execution_time 10 --query "
SELECT DISTINCT number % 5 FROM system.numbers" ||:
echo '---'
timeout 5 ${CLICKHOUSE_CURL} -sS --no-buffer "${CLICKHOUSE_URL}&max_execution_time=10" --data-binary "
SELECT DISTINCT number % 5 FROM system.numbers" ||:
echo '---'
}
# The test depends on timeouts. And there is a chance that under high system load the query
# will not be able to finish in 5 seconds (this will lead to test flakiness).
# Let's check that is will be able to show the expected result at least once.
while true; do
[[ $(test) == $(echo -ne "0\n1\n2\n3\n4\n---\n0\n1\n2\n3\n4\n---\n") ]] && break
sleep 1
done