I noticed this, IS is not treated like = for optimization: SQLITE> CREATE TABLE t(f INTEGER); SQLITE> CREATE INDEX t_f ON t(f) WHERE f IS NOT NULL; SQLITE> EXPLAIN QUERY PLAN SELECT * FROM t WHERE f = 1; QUERY PLAN `--SEARCH TABLE t USING COVERING INDEX t_f (f=?) SQLITE> EXPLAIN QUERY PLAN SELECT * FROM t WHERE f IS 1; QUERY PLAN `--SCAN TABLE t SQLITE> EXPLAIN QUERY PLAN SELECT * FROM t WHERE f IS 1 AND f IS NOT NULL; QUERY PLAN `--SEARCH TABLE t USING COVERING INDEX t_f (f=?)
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