ClickHouse/dbms/tests/queries/0_stateless/00852_any_join_nulls.sql

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USE test;
DROP TABLE IF EXISTS table1;
DROP TABLE IF EXISTS table2;
CREATE TABLE table1 ( id String ) ENGINE = Log;
CREATE TABLE table2 ( parent_id String ) ENGINE = Log;
insert into table1 values ('1');
SELECT table2.parent_id = '', isNull(table2.parent_id)
FROM table1 ANY LEFT JOIN table2 ON table1.id = table2.parent_id;
SET join_use_nulls = 1;
SELECT table2.parent_id = '', isNull(table2.parent_id)
FROM table1 ANY LEFT JOIN table2 ON table1.id = table2.parent_id;
DROP TABLE test.table1;
DROP TABLE test.table2;