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Mongodb Explain for Aggregation framework

...ve you the desired results (documentation here). For older versions >= 2.6, you will need to use the explain option for aggregation pipeline operations explain:true db.collection.aggregate([ { $project : { "Tags._id" : 1 }}, { $unwind : "$Tags" }, { $match: {$or: [{"Tags._id":"tag1...
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Which is faster: Stack allocation or Heap allocation

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When should you NOT use a Rules Engine? [closed]

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How to add local jar files to a Maven project?

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Is there a C++ gdb GUI for Linux? [closed]

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Using numpad in Vi (Vim) via PuTTY

... Peter Mortensen 26.5k2121 gold badges9292 silver badges122122 bronze badges answered Sep 2 '11 at 14:12 PyklerPykler ...
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What's the u prefix in a Python string?

... 162 You're right, see 3.1.3. Unicode Strings. It's been the syntax since Python 2.0. Python 3 mad...
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Pandas - How to flatten a hierarchical index in columns

... answered Jan 24 '13 at 18:37 Andy HaydenAndy Hayden 262k7373 gold badges527527 silver badges485485 bronze badges ...
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How do I install pip on macOS or OS X?

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Get the name of the currently executing method

... answered Oct 14 '08 at 0:24 Mark A. NicolosiMark A. Nicolosi 69.1k1010 gold badges4040 silver badges4646 bronze badges ...