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Introduce Pattern matching with mongo-clarify Hello hey for Engineers vol.3 @_morihirok

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About me • Github: morihirok • Twitter: @_morihirok • STORES.jp
 ϓϩμΫτਪਐνʔϜ

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Ruby 2.7ͷ৽ػೳ Pattern matching͕ ໘നͦ͏

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3VCZ,BJHJ1BUUFSONBUDIJOH/FXGFBUVSFJO3VCZΑΓҾ༻ IUUQTTQFBLFSEFDLDPNL@UTKQBUUFSONBUDIJOHOFXGFBUVSFJOSVCZEPU

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3VCZ,BJHJ1BUUFSONBUDIJOH/FXGFBUVSFJO3VCZΑΓҾ༻ IUUQTTQFBLFSEFDLDPNL@UTKQBUUFSONBUDIJOHOFXGFBUVSFJOSVCZEPU

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࢖ͬͯΈ͍ͨͷͰ Կ͔࡞Ζ͏

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.POHP%#YΠϯσοΫεੜ੒લޙͷFYQMBJO ݁ՌΛಡΉΑΓҾ༻ IUUQTCMPHNLOLJTLDPNNPOHPECJOEFYFYQMBJO

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MongoDBͷexplain͸ গ͠ಡΈͮΒ͍…

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MongoDBͷexplain݁Ռͷ αϯϓϧ > db.items.find({price: 119}).explain("executionStats") { "queryPlanner" : { "plannerVersion" : 1, "namespace" : "sample_db.items", "indexFilterSet" : false, "parsedQuery" : { "price" : { "$eq" : 119 } }, "winningPlan" : { "stage" : "COLLSCAN", "filter" : { "price" : { "$eq" : 119 } શͯ+40/Ͱදݱ͞ΕΔ

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͜ΕΛಡΈ΍͘͢ දࣔͤ͞Δͷʹ Pattern matching͕ ศརͦ͏

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ͱ͍͏͜ͱͰ࡞ͬͨͷ͕͜Ε FYQMBJOͷ+40/Λ ͍͍۩߹ʹ.BSLEPXOͷ ςʔϒϧʹม׵͢Δ

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ΠϯσοΫε͕ޮ͍ͯͳ͍ͱ͖ͷ explain݁Ռ ͕͜͜z$0--4$"/zʹͳΔ

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͜͏ॻ͚Δ ͕͜͜z$0--4$"/zʹͳΔ

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ΠϯσοΫε͕ޮ͍͍ͯΔͱ͖ͷ explain݁Ռ ͕͜͜z'&5$)zʹมΘΔ ͕͜͜z*94$"/zʹͳΔ ͜͜ʹΠϯσοΫε໊͕ೖΔ

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͜͏ॻ͚Δ ͕͜͜z'&5$)zʹมΘΔ ͕͜͜z*94$"/zʹͳΔ ͜͜ʹΠϯσοΫε໊͕ೖΔ

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͜͏ॻ͚Δ ม਺ΛόΠϯυͰ͖Δ ͜͜ʹΠϯσοΫε໊͕ೖΔ

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࠷ऴతʹ͸͜͏ͳΔ

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STORES.jpͰ΋ ͍͍ײ͡ʹ࢖͑ͦ͏

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໰୊ൃੜ

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Ruby 2.7(trunk)͡Όͳ͍ͱ ࢖͑ͳ͍

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Pattern matchingແ͠Ͱ ॻ͖׵͑Δ

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Pattern matchingແ͠Ͱ ॻ͖׵͑Δ

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কདྷతʹ ॏๅ͞Εͦ͏ͳ༧ײ

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ࠓ೔ͷίʔυ͸ͪ͜Β͔Β IUUQTHJUIVCDPNNPSJIJSPLNPOHPDMBSJGZ