jsdataframe.js
function keyIndexing(selector, maxLen, index) {
  var opts = resolverOpts(RESOLVE_MODE.KEY, maxLen, index);
  return resolveSelector(selector, opts);
}
function keyIndexing(selector, maxLen, index) {
  var opts = resolverOpts(RESOLVE_MODE.KEY, maxLen, index);
  return resolveSelector(selector, opts);
}
function keyIndexing ( selector , maxLen , index ) { var opts = resolverOpts ( RESOLVE_MODE . KEY , maxLen , index ) ; return resolveSelector ( selector , opts ) ; }
Perform key lookup indexing 'index' should be an AbstractIndex implementation
Perform key lookup indexing index should be an AbstractIndex implementation