Function findIndexForField

packages/db/src/utils/index-optimization.ts:45–70

(
  collection: CollectionLike<any, TKey>,
  fieldPath: Array<string>,
  compareOptions?: CompareOptions,
)

 * Finds an index that matches a given field path
 */
export function findIndexForField<TKey extends string | number>(
  collection: CollectionLike<any, TKey>,
  fieldPath: Array<string>,
  compareOptions?: CompareOptions,
): IndexInterface<TKey> | undefined {
  if (hasVirtualPropPath(fieldPath)) {
    return undefined
  }
  const compareOpts = compareOptions ?? {
    ...DEFAULT_COMPARE_OPTIONS,
    ...collection.compareOptions,
  }

  for (const index of collection.indexes.values()) {
    if (
      index.matchesField(fieldPath) &&
      index.matchesCompareOptions(compareOpts)
    ) {
      if (!index.matchesDirection(compareOpts.direction)) {
        return new ReverseIndex(index)
      }
      return index
    }
  }
  return undefined
}

/**
 * Intersects multiple sets (AND logic)