Hello, I'm experiencing some strange behavior when executing the following query in the BaseX 9.2.4 GUI (nevermind the awkward query structure - that is just to be able to inspect the results of the individual evaluation steps):
let $t := <x>200.0000</x> let $num := number($t) let $gt5000 := $num gt 5000 let $ltMinus5000 := $num lt -5000 return $gt5000 or $ltMinus5000
The result is true, although it should be false.
The compilation and optimization logs for this query in the GUI tell us the following: ---------- Compiling: - rewrite > comparison to range comparison: ($num_1 > 5000) -> ($num_1 >= 5000.000000000001) - rewrite 'gt' comparison to range comparison: ($num_1 gt 5000) -> ($num_1 >= 5000.000000000001) - pre-evaluate unary expression to xs:integer item: -5000 - rewrite < comparison to range comparison: ($num_1 < -5000) -> ($num_1 <= -5000.000000000001) - rewrite 'lt' comparison to range comparison: ($num_1 lt -5000) -> ($num_1 <= -5000.000000000001) - inline $gt5000_2 - inline $ltMinus5000_3 - simplify or: (true()) - pre-evaluate or to xs:boolean item: (true()) -> true() - remove unused variable $num_1 - remove unused variable $t_0 - simplify FLWOR expression: true() Optimized Query: true() ----------
When the return statement is changed to "return ($num,$gt5000,$ltMinus5000,$gt5000 or $ltMinus5000)" then the result of the boolean operation (last element of the result sequence) is false, as expected. The GUI log then is: ---------- Compiling: - rewrite > comparison to range comparison: ($num_1 > 5000) -> ($num_1 >= 5000.000000000001) - rewrite 'gt' comparison to range comparison: ($num_1 gt 5000) -> ($num_1 >= 5000.000000000001) - pre-evaluate unary expression to xs:integer item: -5000 - rewrite < comparison to range comparison: ($num_1 < -5000) -> ($num_1 <= -5000.000000000001) - rewrite 'lt' comparison to range comparison: ($num_1 lt -5000) -> ($num_1 <= -5000.000000000001) Optimized Query: let $t_0 := element x { ("200.0000") } let $num_1 := number($t_0) let $gt5000_2 := ($num_1 >= 5000.000000000001) let $ltMinus5000_3 := ($num_1 <= -5000.000000000001) return ($num_1, $gt5000_2, $ltMinus5000_3, ($gt5000_2 or $ltMinus5000_3)) ----------
Am I missing something, or could this be a bug in BaseX 9.2.4? With BaseX 9.0.2, both queries (with the different return statements) returned the expected value false for the boolean operation.
Best regards, Johannes