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private static Map<String, Integer> namesToNumPurchases = new HashMap<String, Integer>() {{ put("Chris", 10); put("Bob", 5); put("David", 5); put("Sue", 12); put("Jim", 3); }}; /* Required output: 3: Jim 5: Bob, David 10: Chris 12: Sue */
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Data Engineer

Interviewed at Apple

4.1★
Jul 8, 2018

private static Map<String, Integer> namesToNumPurchases = new HashMap<String, Integer>() {{ put("Chris", 10); put("Bob", 5); put("David", 5); put("Sue", 12); put("Jim", 3); }}; /* Required output: 3: Jim 5: Bob, David 10: Chris 12: Sue */

Asked by the interviewer a "Data Engineer" to join 2 tables together to label start/end of a track play , only when I proposed a working solution he diverted me to another solution that he had in mind all along, thinking it was better as it didn't require window functions, but it did require them. He just didn't know they are called window functions. Admittedly, the "Data Engineer" said he hasn't worked on spark in a while, and is quite junior.
avatar

Data Engineer

Interviewed at Spotify

4★
Apr 7, 2020

Asked by the interviewer a "Data Engineer" to join 2 tables together to label start/end of a track play , only when I proposed a working solution he diverted me to another solution that he had in mind all along, thinking it was better as it didn't require window functions, but it did require them. He just didn't know they are called window functions. Admittedly, the "Data Engineer" said he hasn't worked on spark in a while, and is quite junior.

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