Added a test from @reqq #5155

tests/queries/0_stateless/01266_default_prewhere_reqq.reference

+0	bbb_aaa

tests/queries/0_stateless/01266_default_prewhere_reqq.sql

+DROP TABLE IF EXISTS t1;
+
+CREATE TABLE t1
+(
+    date Date, 
+    s1 String,
+    s2 String
+) ENGINE = MergeTree() PARTITION BY toYYYYMMDD(date) ORDER BY (date, s1)
+SETTINGS index_granularity = 8192;
+
+insert into t1 (date, s1,s2) values(today()-1,'aaa','bbb');
+alter table t1 add column s3 String DEFAULT concat(s2,'_',s1);
+insert into t1 (date, s1,s2) values(today(),'aaa2','bbb2');
+select ignore(date), s3 from t1 where  s2='bbb';
+
+DROP TABLE t1;