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, wherein each of the defined logical fields is associated with a respective access method specifying a manner of mapping the logical field to a corresponding one or more physical fields of the underlying physical data, and wherein the respective access method is selected from two or more different types of access methods; 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 selected one or more conditional expressions is presented with an indication communicating that the respective conditional expression is disabled, such that each of the selected 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 selected one or more conditional expressions, comprising: generating a temporary abstract query based on the abstract query and the selected one or more conditional expressions, wherein the temporary abstract query excludes the selected one or more conditional expressions; transforming the generated temporary abstract query into an executable query; and executing the executable query against the underlying physical data to produce a set of query results; and returning the set of query results of executing the abstract query to the query interface.