es2015/object-store/query-engine.js
function canOptimizeSorting(expectedSortingDirection, order) {
  for (let orderingFieldPath of order) {
    if ((orderingFieldPath.charAt(0) === "!") !== expectedSortingDirection) {
      return false
    }
  }
  
  return true
}
function canOptimizeSorting(expectedSortingDirection, order) {
  for (let orderingFieldPath of order) {
    if ((orderingFieldPath.charAt(0) === "!") !== expectedSortingDirection) {
      return false
    }
  }
  
  return true
}
function canOptimizeSorting ( expectedSortingDirection , order ) { for ( let orderingFieldPath of order ) { if ( ( orderingFieldPath . charAt ( 0 ) === "!" ) !== expectedSortingDirection ) { return false } } return true }
Determines whether the sorting of the query result can be done through an
index (provided such index exists) or the natural order of the records in
the object store.

@param {boolean} expectedSortingDirection The sorting direction that is
expected from all sort-by fields so that the sorting can be
optimized. {@code true} represents descending order, {@code false}
represents ascending order.
@param {string[]} order Ordering field paths specifying how the records
should be sorted.
@return {boolean} {@code true} if the sorting can be optimized, if an
appropriate index exists or the natural order of the records in the
object store matches the order denoted by the field paths.
Determines whether the sorting of the query result can be done through an index ( provided such index exists ) or the natural order of the records in the object store .