SQLite

When a table has an index on an expression, then inserting a zeroblob into an indexed column of that table might cause the zeroblob to be truncated.

CREATE TABLE t1(a,b,c);
CREATE INDEX t1bbc ON t1(b, b+c);
INSERT INTO t1(a,b,c) VALUES(1,zeroblob(8),3);
SELECT a, b, length(b), c FROM t1;

The correct answer is

1,X'0000000000000000',8,3

But the answer returned is:

1,X'',0,3

This issue was discovered during internal testing. There have been no reports of this from the wild.