Add test for #2582

tests/queries/0_stateless/01834_alias_columns_laziness_filimonov.reference

@@ -0,0 +1 @@
+Ok

tests/queries/0_stateless/01834_alias_columns_laziness_filimonov.sh

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+#!/usr/bin/env bash
+
+CUR_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CUR_DIR"/../shell_config.sh
+
+${CLICKHOUSE_CLIENT} --multiquery --query "
+drop table if exists aliases_lazyness;
+create table aliases_lazyness (x UInt32, y ALIAS sleepEachRow(0.1)) Engine=MergeTree ORDER BY x;
+insert into aliases_lazyness(x) select * from numbers(40);
+"
+
+# In very old ClickHouse versions alias column was calculated for every row.
+# If it works this way, the query will take at least 0.1 * 40 = 4 seconds.
+# If the issue does not exist, the query should take slightly more than 0.1 seconds.
+# The exact time is not guaranteed, so we check in a loop that at least once 
+# the query will process in less than one second, that proves that the behaviour is not like it was long time ago.
+
+while true
+do
+    timeout 1 ${CLICKHOUSE_CLIENT} --query "SELECT x, y FROM aliases_lazyness WHERE x = 1 FORMAT Null" && break
+done
+
+${CLICKHOUSE_CLIENT} --multiquery --query "
+drop table aliases_lazyness;
+SELECT 'Ok';
+"