Louis Reasoner wonders why the simple-query and disjoin proceduresare implemented using explicit…

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Louis Reasoner wonders why the simple-query and disjoin proceduresare implemented using explicit delay operations, rather than being defined asfollows:

(define (simple-query query-pattern frame-stream)

(stream-flatmap

(lambda (frame)

(stream-append (find-assertions query-pattern frame)

(apply-rules query-pattern frame)))

frame-stream))

(define (disjoin disjuncts frame-stream)

(if (empty-disjunction? disjuncts)

the-empty-stream

(interleave

(qeval (first-disjunct disjuncts) frame-stream)

(disjoin (rest-disjuncts disjuncts) frame-stream))))

Can you give examples of queries where these simpler definitions would lead to undesirable behavior?

 

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