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mongodb group values by multiple fields

...urse the ability to interpolate the variable through $expr using $match to select the matching items in the "join", but the general premise is a "pipeline within a pipeline" where the inner content can be filtered by matches from the parent. Since they are both "pipelines" themselves we can $limit e...
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Too many 'if' statements?

... @SList no, comments don't run. OP did exactly what should be done; convert comments to clear code. See e.g. Steve McConnell Code Complete stevemcconnell.com/cccntnt.htm – djechlin Mar 24 '14 at 12:46 ...
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How does Bluebird's util.toFastProperties function make an object's properties “fast”?

... Now, JSObject::MigrateSlowToFast just explicitly takes the Dictionary and converts it into a fast V8 object. It's a worthwhile read and an interesting insight into v8 object internals - but it's not the subject here. I still warmly recommend that you read it here as it's a good way to learn about v...
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How to print color in console using System.out.println?

... which doesn't work because the Java IO layer does not convert those to colors. System.out.println((char)27 + "[31;1mERROR" + (char)27 + "[0m" only yields "[31;1mERROR[0m" when run from a windows cmd.com as an executable .jar – simpleuser Fe...
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How to get root access on Android emulator?

...tore system.img from temp folder as replace of default system.img. How to convert the resulting temporary root on a permanent First - it goes to SuperSu. It offers a binary upgrade. Update in the normal way. Reboot reject. Second - only relevant for emulators. The same AVD. The bottom line is tha...
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Way to get number of digits in an int?

...I didn't realise all these if else statements would be SO much faster than converting the int to String then calling .length. +1 – Ogen Aug 30 '14 at 4:01 15 ...
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How to use underscore.js as a template engine?

... template loading you have many options, but at the end you always have to convert the template into string. You can give it as normal string like the example above, or you can load it from a script tag, and use the .html() function of jquery, or you can load it from a separate file with the tpl plu...
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Sibling package imports

...ing as a package works too (but will turn out a bit awkward if you want to convert your working directory into an installable package). For the tests, specifically, pytest is able to find the api package in this situation and takes care of the sys.path hacks for you So it really depends on what yo...
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Error in finding last used cell in Excel with VBA

...ad data? You will end up reaching the last row in the worksheet! It's like selecting cell A1 and then pressing End key and then pressing Down Arrow key. This will also give you unreliable results if there are blank cells in a range. CountA is also unreliable because it will give you incorrect resul...
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What is the difference between partitioning and bucketing a table in Hive ?

... Interesting, I agree w.r.t the usage in select query. But wondered why people are using clustered by and sorted by together in table creation statement. If there is no significance to SORTED BY in DDL, then why this keyword is present? Didnt get that. ...