Hello everyone,
Consider the following example:
```SQL
CREATE TABLE t0 (c0 TEXT NOT NULL UNIQUE, c1 TEXT);
INSERT INTO t0 VALUES ('1', NULL), ( x'0A'||'2', NULL);
SELECT c0 FROM t0 GROUP BY 0.5;
```
What does the "GROUP BY 0.5" mean? And what's the expected result of the example?
Looking forward to your explanation!