attach_to_list          Combine two lists
err_msg                 Generate error message
in_range                Check if value fits to a range
in_string               Check if character value matches the provided
                        pattern
is_empty                Compare the string to empty value
lget_attr               Extract attribute of each element from a set of
                        lists
operator_name_prefix    Prefix used for renaming operators names
prefix_operators_name   Rename operators with the provided prefix
query-condition         Register new or list existing query conditions
query-operator          Register new or list existing query operators
query-rules             Define filtering query
queryBuilder-package    Build Filtering Query from Configuration
queryBuilderConfig      Default object storing 'queryBuilder'
                        configuration.
queryBuilderConfigClass
                        R6 class representing 'queryBuilderConfig'
                        object.
queryToExpr             Parse query rules to R filtering expression
query_to_expr_bare      Convert query definition to expression
remove_by_name          Remove list elements by their names
rule_to_expr            Convert rule definition to expression
substitute_q            Substitute expression stored as a variable
