Hi,
Using SQLite version 3.15.2, the following SQL returns 0 rows, whereas
I believe it should return 1 row. Any of the commented out alternatives
produces the expected 1 row.
Mark
CREATE VIEW W AS
SELECT 0 show_a;
CREATE VIEW X AS
SELECT 'A' a, 1 v
UNION SELECT 'B', 1;
CREATE VIEW Y AS
SELECT * FROM W JOIN X;
SELECT CASE WHEN group_by_a THEN a END a, SUM(v) v
FROM Y
LEFT JOIN (SELECT NULL group_by_a UNION SELECT 1) x2
ON show_a AND a IS NOT NULL
--ON show_a = 1 AND a IS NOT NULL
-- ON IFNULL(show_a, 0) AND a IS NOT NULL
--ON NOT(NOT(show_a)) AND a IS NOT NULL
GROUP BY CASE WHEN group_by_a THEN a END;
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