See this inconsistent results. ('1')IS(v0.c1) IS FALSE is evaluated true at the third SELECT, but the second SELECT does not return any row.

CREATE TABLE t0 (c0);
CREATE VIEW v0(c0, c1) AS SELECT CUME_DIST() OVER (PARTITION BY t0.c0), TRUE FROM t0;
INSERT INTO t0 VALUES ('x');

SELECT ALL * FROM v0, t0;
-- 1.0|1|x
SELECT * FROM v0, t0 WHERE ('1')IS(v0.c1) IS FALSE;
-- Null
SELECT ('1')IS(v0.c1) IS FALSE FROM v0, t0;
-- 1

Environment:

Version: 3.39.0

Commit ID: 8eb9a7dd

OS: Ubuntu 20.04

Configuration Options: ./configure --enable-all

Compiler: gcc-9

Client: CLI

Thanks!