PRAGMA cache_size = -2000;
CREATE TABLE t1(a, b, c);
WITH r(i) AS (
SELECT 1 UNION ALL SELECT i+1 FROM r WHERE i<100000
)
INSERT INTO t1 SELECT randomblob(100),randomblob(100),randomblob(100) FROM r;
CREATE INDEX t1a ON t1(a);
CREATE INDEX t1b ON t1(b);
CREATE INDEX t1c ON t1(c);
SELECT count(*) FROM t1 WHERE +a IS NOT NULL