#!/usr/bin/env bash

CURDIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
# shellcheck source=../shell_config.sh
. "$CURDIR"/../shell_config.sh


$CLICKHOUSE_CLIENT --query="DROP TABLE IF EXISTS table_to_rename"

$CLICKHOUSE_CLIENT --query="CREATE TABLE table_to_rename(v UInt64, v1 UInt64)ENGINE = MergeTree ORDER BY tuple() SETTINGS min_bytes_for_wide_part = 0"

$CLICKHOUSE_CLIENT --query="INSERT INTO table_to_rename VALUES (1, 1)"


# we want to following mutations to stuck
# That is why we stop merges and wait in loops until they actually start
$CLICKHOUSE_CLIENT --query="SYSTEM STOP MERGES table_to_rename"

$CLICKHOUSE_CLIENT --query="ALTER TABLE table_to_rename UPDATE v1 = 77 WHERE 1 = 1 SETTINGS mutations_sync = 2" &

counter=0 retries=60

I=0
while [[ $counter -lt $retries ]]; do
    I=$((I + 1))
    result=$($CLICKHOUSE_CLIENT --query "SELECT count() from system.mutations where database='${CLICKHOUSE_DATABASE}' and table='table_to_rename'")
    if [[ $result == "1" ]]; then
        break;
    fi
    sleep 0.1
    ((++counter))
done

$CLICKHOUSE_CLIENT --query="ALTER TABLE table_to_rename RENAME COLUMN v1 to v2" &


# it will not introduce any flakyness
# just wait that mutation doesn't start
sleep 3

$CLICKHOUSE_CLIENT --query="SYSTEM START MERGES table_to_rename"

wait

$CLICKHOUSE_CLIENT --query="SELECT * FROM table_to_rename FORMAT JSONEachRow"


 $CLICKHOUSE_CLIENT --query="DROP TABLE IF EXISTS table_to_rename"