offshore

<!doctype html> <html lang="en"> <head> <title>Code coverage report for lib/offshore/query/integrator/_partialJoin.js</title> <meta charset="utf-8" /> <link rel="stylesheet" href="../../../../prettify.css" /> <link rel="stylesheet" href="../../../../base.css" /> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type='text/css'> .coverage-summary .sorter { background-image: url(../../../../sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1> <a href="../../../../index.html">all files</a> / <a href="index.html">lib/offshore/query/integrator/</a> _partialJoin.js </h1> <div class='clearfix'> <div class='fl pad1y space-right2'> 100% Statements 20/20 </div> <div class='fl pad1y space-right2'> 92.86% Branches 13/14 </div> <div class='fl pad1y space-right2'> 100% Functions 2/2 </div> <div class='fl pad1y space-right2'> 100% Lines 20/20 </div> </div> </div> <div class='status-line high'></div> <pre><table class="coverage"> <tr><td class="line-count quiet">1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88</td><td class="line-coverage quiet">      2× 2×                                                                                       2×     2304× 2304× 2304× 2304× 2304× 2304× 2304×   2304×     2304×       1487×       817×     817× 817× 4145× 4145×         817×       817×    </td><td class="text"><pre class="prettyprint lang-js">/** * Module dependencies */ var assert = require('assert'); var _ = require('lodash');     /** * _partialJoin * * @api private * * Check whether two rows match on the specified keys, * and if they do, merge `parentRow` into a copy of `childRow` * and return it (omit `childRow`'s key, since it === `parentRow`'s). * * Hypothetically, this function could be operated by a stream, * but in the case of a left outer join, at least, the final * result set cannot be accurately known until both the complete * contents of both the `left` and `right` data set have been checked. * * An optimization from polynomial to logarithmic computational * complexity could potentially be achieved by taking advantage * of the known L[k..l] and R[m..n] values as each new L[i] or R[j] * arrives from a stream, but a comparably-sized cache would have to * be maintained, so we'd still be stuck with polynomial memory usage. * i.e. O( |R|*|L| ) This could be resolved by batching-- e.g. grab the * first 3000 parent and child rows, join matches together, discard * the unneeded data, and repeat. * * Anyways, worth investigating, since this is a hot code path for * cross-adapter joins. * * * Usage: * * partialJoin({ * parentRow: { id: 5, name: 'Lucy', email: 'lucy@fakemail.org' } * childRow: { owner_id: 5, name: 'Rover', breed: 'Australian Shepherd' } * parentKey: 'id' * childKey: 'owner_id', * childNamespace: '.' * }) * * @param {Object} options * @return {Object|False} If false, don't save the join row. * @synchronous */ module.exports = function partialJoin(options) {   // Usage var invalid = false; invalid = invalid || !_.isObject(options); invalid = invalid || !_.isString(options.parentKey); invalid = invalid || !_.isString(options.childKey); invalid = invalid || !_.isObject(options.parentRow); invalid = invalid || !_.isObject(options.childRow); assert(!invalid);   var CHILD_ATTR_PREFIX = (options.childNamespace || '.');   // If the rows aren't a match, bail out if ( options.childRow[options.childKey] !== options.parentRow[options.parentKey] ) { return false; }   // deep clone the childRow, then delete `childKey` in the copy. var newJoinRow = _.cloneDeep(options.childRow);   // namespace the remaining attributes in childRow var namespacedJoinRow = {}; _.each(newJoinRow, function(value, key) { var namespacedKey = CHILD_ATTR_PREFIX + key; namespacedJoinRow[namespacedKey] = value; });     // Merge namespaced values from current parentRow into the copy. _.merge(namespacedJoinRow, options.parentRow);     // Return the newly joined row. return namespacedJoinRow; };  </pre></td></tr> </table></pre> <div class='push'></div> </div> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="http://istanbul-js.org/" target="_blank">istanbul</a> at Tue Apr 17 2018 10:49:40 GMT+0200 (CEST) </div> </div> <script src="../../../../prettify.js"></script> <script> window.onload = function () { if (typeof prettyPrint === 'function') { prettyPrint(); } }; </script> <script src="../../../../sorter.js"></script> </body> </html>