1. A computer-implemented method, comprising: presenting, in a query interface, an abstract query comprising a plurality of conditional expressions arranged within multiple nested logical levels separated by one or more logical operators, wherein the plurality of conditional expressions is defined in an abstraction model that defines logical fields that model underlying physical data in a manner making a schema of the physical data transparent to a user of the abstraction model; receiving a selection, from the plurality of conditional expressions, of one or more conditional expressions to be disabled in the abstract query; presenting the abstract query in the query interface, wherein each of the one or more conditional expressions is presented with an indication communicating that the respective conditional expression is disabled, such that each of the one or more conditional expressions is maintained in a respective original location within the multiple nested logical levels of the abstract query; executing the abstract query excluding the one or more conditional expressions; and returning a set of results of executing the abstract query to the query interface.