How to convert a Hive array<struct> to string? - arrays

The field I have in Hive has the following structure:
array<struct<`field1`:string, `field2`:string, `field3`:array<string>, `field4`:timestamp>>
What I need is to get the JSON string out of it.
the simple case to string did't work. I then tried the brickhouse UDF (to_json) but it was throwing many errors .. probably because it's not up-to-date.
Is it ever possible?

Related

How can I parse JSON arrays in postgresql?

I am using PostgreSQL 9.5.14, and have a column in a table that contains JSON arrays that I need to parse for their contents.
Using a select I can see that the structure of the JSON is of this kind:
SELECT rule_results from table limit 5;
Result:
[{"rule_key":"applicant_not_lived_outside_eu"},{"rule_key":"family_assets_exceed_limit"},{"rule_key":"owned_a_deed"}]
[]
[]
[{"rule_key":"family_category","details":"apply_with_parents_under_25"}]
[]
I have been unable to create an SQL command to give me the values of the rule_key keys.
I've attempted to use the documentation for json-functions in postgresql to find a solution from
https://www.postgresql.org/docs/9.5/functions-json.html
SELECT rule_results::json->'rule_key' as results from table;
This gives me null values only.
SELECT jsonb_object_keys(rule_results::jsonb) from table;
This results in the error msg "cannot call jsonb_object_keys on a scalar", which seems to mean that the query is limited to a single row.
This looks simple enough, an array with key:value pairs, but somehow the answer eludes me. I would appreciate any help.

demo: db<>fiddle
Different solutions are possible. It depends on what you are expecting finally. But all solutions would use the function json_array_elements(). This expands every element into one row. With that you can do whatever you want.
This results in one row per value:
SELECT
value -> 'rule_key'
FROM
data,
json_array_elements(rule_results)

Swif'ts Array to Realm's Result

I am trying to convert Swift [Object]() array to Realm's Results<Object>!. I know that vice-versa is possible (you can see here) but is it possible to do what I want?
So I want something like result as! [Object].

Result objects are proxies for data stored in the db. You can only get them via queries, but cannot instantiate them yourself (see the docs).
To still get Result objects, you'd have to run a new query for the objects you already have, and use the returned Result... I would not suggest that though.

SQL Server: How to Get Large amount of JSON from Store Procedure

I've created one store procedure that returns the JSON. But it not return complete JSON only limited JSON returned. I used "For JSON auto" after Select statement. Have any Solution to get all JSON?

if you are using any Cast or covert operations. Use VARCHAR(MAX) instead of VARCHAR().
I have seen this issue in such cases.
Also if you are using the print output, then it is possible that the text might get truncated, but you can use the Select or Output parameter instead.
make the output parameter of type nvarchar(max)
or check this link :
Format Query Results as JSON with FOR JSON (SQL Server)
This might help

I found my solution here: https://learn.microsoft.com/en-us/sql/relational-databases/json/format-query-results-as-json-with-for-json-sql-server?view=sql-server-ver15#output-of-the-for-json-clause (same as above, but a specific section)
The issue was that I thought SQL Server was returning a single row/cell of JSON data because that is how SSMS displayed it. The truth is that it chops it into multiple rows.
I was retrieving the data in .NET using ExecuteScalar(), but I needed to use ExecuteReader(), and concatenate all rows together. Once I did that, I could deserialize the JSON without issue.

Importing jSON Array into Hive/Hadoop

I'm using the HortonWorks Hadoop Sandbox and I have imported a jSON string into a table, as per this guide however I run into trouble as my string contains an array which is not handled well by json_tuple(). I have tried the expolode() function, but that returns the following error:
"Error occurred executing hive query: OK FAILED: UDFArgumentException explode() takes an array or a map as a parameter"
What does that mean exactly and how can I fix it? Would the problem be with the format of the table? I just followed as per the guide above and created the table with:
CREATE EXTERNAL TABLE games
(
value STRING
)
LOCATION '/user/hue/games'
The value I am trying to explode is an array like this:
[{"gameId":49927894,"invalid":false,"gameMode":"CLASSIC","gameType":"MATCHED_GAME","subType":"RANKED_SOLO_5x5","mapId":1,"teamId":100,"championId":53,"spell1":4,"spell2":14,"level":30,"ipEarned":228,"createDate":1404215396001,"fellowPlayers":[{"summonerId":305443,"teamId":200,"championId":62},{"summonerId":468080,"teamId":100,"championId":23},{"summonerId":356814,"teamId":100,"championId":64},{"summonerId":279828,"teamId":200,"championId":222},{"summonerId":284016,"teamId":100,"championId":112},{"summonerId":222776,"teamId":200,"championId":37},{"summonerId":380226,"teamId":100,"championId":104},{"summonerId":871165,"teamId":200,"championId":238},{"summonerId":443896,"teamId":200,"championId":102}],"stats":{"level":12,"goldEarned":7829,"numDeaths":2,"barracksKilled":1,"minionsKilled":15,"championsKilled":2,"goldSpent":6755,"totalDamageDealt":21181,"totalDamageTaken":10271,"team":100,"win":true,"largestMultiKill":1,"physicalDamageDealtPlayer":8258,"magicDamageDealtPlayer":12390,"physicalDamageTaken":7603,"magicDamageTaken":2215,"timePlayed":1560,"totalHeal":782,"totalUnitsHealed":1,"assists":7,"item0":3069,"item1":3024,"item2":2045,"item3":3117,"item4":3082,"item6":3341,"visionWardsBought":1,"magicDamageDealtToChampions":3193,"physicalDamageDealtToChampions":1144,"totalDamageDealtToChampions":4870,"trueDamageDealtPlayer":532,"trueDamageDealtToChampions":532,"trueDamageTaken":451,"wardKilled":2,"wardPlaced":12,"totalTimeCrowdControlDealt":36}},{"gameId":49921219,"invalid":false,"gameMode":"CLASSIC","gameType":"MATCHED_GAME","subType":"RANKED_SOLO_5x5","mapId":1,"teamId":100,"championId":72,"spell1":4,"spell2":11,"level":30,"ipEarned":71,"createDate":1404210159007,"fellowPlayers":[{"summonerId":323330,"teamId":100,"championId":102},{"summonerId":430227,"teamId":200,"championId":134},{"summonerId":1403590,"teamId":200,"championId":114},{"summonerId":382370,"teamId":100,"championId":99},{"summonerId":445767,"teamId":100,"championId":51},{"summonerId":490295,"teamId":200,"championId":19},{"summonerId":313523,"teamId":100,"championId":4},{"summonerId":308769,"teamId":200,"championId":25},{"summonerId":1591549,"teamId":200,"championId":67}],"stats":{"level":16,"goldEarned":12337,"numDeaths":5,"minionsKilled":60,"championsKilled":4,"goldSpent":11955,"totalDamageDealt":128541,"totalDamageTaken":37539,"killingSprees":1,"largestKillingSpree":2,"team":100,"win":false,"neutralMinionsKilled":84,"largestMultiKill":1,"physicalDamageDealtPlayer":68670,"magicDamageDealtPlayer":40557,"physicalDamageTaken":25561,"magicDamageTaken":8767,"timePlayed":2354,"totalHeal":4024,"totalUnitsHealed":1,"assists":12,"item0":3143,"item1":3102,"item2":2045,"item3":3283,"item4":3207,"item6":3364,"visionWardsBought":2,"magicDamageDealtToChampions":3449,"physicalDamageDealtToChampions":3735,"totalDamageDealtToChampions":7690,"trueDamageDealtPlayer":19313,"trueDamageDealtToChampions":505,"trueDamageTaken":3209,"wardKilled":3,"wardPlaced":5,"neutralMinionsKilledEnemyJungle":7,"neutralMinionsKilledYourJungle":77,"totalTimeCrowdControlDealt":1290}},{"gameId":49846672,"invalid":false,"gameMode":"CLASSIC","gameType":"MATCHED_GAME","subType":"RANKED_SOLO_5x5","mapId":1,"teamId":100,"championId":72,"spell1":4,"spell2":11,"level":30,"ipEarned":92,"createDate":1404137990304,"fellowPlayers":[{"summonerId":390284,"teamId":100,"championId":29},{"summonerId":333970,"teamId":200,"championId":236},{"summonerId":306968,"teamId":200,"championId":157},{"summonerId":275006,"teamId":200,"championId":84},{"summonerId":271369,"teamId":200,"championId":92},{"summonerId":942667,"teamId":100,"championId":68},{"summonerId":475293,"teamId":100,"championId":201},{"summonerId":560185,"teamId":100,"championId":115},{"summonerId":340177,"teamId":200,"championId":54}],"stats":{"level":18,"goldEarned":14683,"numDeaths":3,"barracksKilled":1,"turretsKilled":2,"minionsKilled":33,"championsKilled":10,"goldSpent":13153,"totalDamageDealt":146399,"totalDamageTaken":29156,"doubleKills":1,"killingSprees":1,"largestKillingSpree":9,"team":100,"win":true,"neutralMinionsKilled":86,"largestMultiKill":2,"physicalDamageDealtPlayer":85905,"magicDamageDealtPlayer":42140,"physicalDamageTaken":25170,"magicDamageTaken":2669,"largestCriticalStrike":349,"timePlayed":1932,"totalHeal":4997,"totalUnitsHealed":1,"assists":19,"item0":3143,"item1":3207,"item2":3211,"item3":3078,"item4":3009,"item5":1028,"item6":3340,"visionWardsBought":2,"magicDamageDealtToChampions":4955,"physicalDamageDealtToChampions":6923,"totalDamageDealtToChampions":12270,"trueDamageDealtPlayer":18353,"trueDamageDealtToChampions":391,"trueDamageTaken":1317,"wardKilled":3,"wardPlaced":7,"neutralMinionsKilledEnemyJungle":6,"neutralMinionsKilledYourJungle":80,"totalTimeCrowdControlDealt":879}},{"gameId":49842237,"invalid":false,"gameMode":"CLASSIC","gameType":"MATCHED_GAME","subType":"RANKED_SOLO_5x5","mapId":1,"teamId":200,"championId":72,"spell1":4,"spell2":11,"level":30,"ipEarned":239,"createDate":1404132909924,"fellowPlayers":[{"summ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Any help very much appreciated!

The explode() hive function takes a hive array or map, and you gave it a String value. json_tuple() worked in the guide because it made your string into a map.
You'll want to convert your json array into a format that hive can accept, or use one of the JSON SerDes or something of that nature in order to query the way you want.
JSON SerDe for Hive that supports JSON arrays

VB.Net - Excel application get showing values of an range

I'm trying get an Excel Range and copy into an array of objects with Vb.Net.
This is not a problem. I use the following code:
Dim vValues(,) As Object = ExcelApp.Range(vRange).Value
And works fine; but I have a the following case:
In the column "C"; the value has a specific format and internally has another value.
My question is:
Somebody know the way to get the information exact as the user see?
I'm trying to get the information without use a For ... Each or some kind of cycle.
I'm also tried to avoid use "text to columns" function.
Both seems right solutions, but would impact the performance with a lot of data.
FYI: Also I can get the information through the ODBC connection; but I'm searching the solution using a Range

Exactly what the user sees is the Text property. But you cannot have an array of that, you will have to query each cell individually.
You are getting a Double value in your array instead of a DateTime value because you have "Time" formatting applied in Excel. If you had a format from the "Date" category, Excel would instead send a proper Variant/Date, not a Double that represents it.
Another option would be constructing the DateTime objects on the .NET side, provided you know in which columns they should be.

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