QueryBuilderFactory:: applyFilterOr() and QueryBuilderFactory:: applyFilterAnd() could return `ParameterCollection` object

[sensorario]

Q	A
Bug report?	no
Feature request?	yes
QueryBundle version	2.5

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Instead of return scalar types array, it could be better to return a collection of items. A

[AlessandroMinoccheri]

applyFilterAnd doesn't return anything, but applyFilterOr returns an array, we could create a new class called OrFilter or something similar, what do you think?