Hive create json array

accept. The question interesting, too..

Hive create json array

You have to create the table with a structure that maps the structure of the json. Then you should upload your json file in the location path of the table, giving the right permissions and you are good to go. First of all, thanks a lot for the response, second my apologies that I could not respond you timely. So, above solution would not work in my case.

I can not create hive table manually with these number of elements and also Objects nested at 10th level. Support Questions. Find answers, ask questions, and share your expertise.

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Create JSON with Java, Part 2: Json, JsonObject, JsonArray

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Labels: Hive. Thanks, Jai. Reply 7, Views. Reply 6, Views. I took all XSDs into XML Spy tool and generated sample xml I still had to fix some elements with default values in it because Spark was able to infer more correctly and intelligently. We know Avro file has schema in it. Already a User? Sign In. Don't have an account?I would like to parse this table in order to get a new table logs with 3 fields: ts, id, log.

I broke the lines up so that it would be a little easier to read. I'm using substr to strip the first and last characters, removing [ and ]. Internally uses org. JsonSerDe but is independent of the Serde of the Hive table. This serializer requires HCatalog to be installed. So maybe you are implementing something wrong in the SerDe.

This user solved the problem of serialising a JSON with arrays by performing a previous regexp:. Another thing you may try is to change the SerDe. At least you have this two options maybe there are some more :. Thank you! I just ran into this problem, with the JSON array stored as a string in the hive table. I assume it is possible, despite I never tried myself. At least you have this two options maybe there are some more : 'org.

JsonSerDe' 'org. Can comments be used in JSON? How to append something to an array? What is the correct JSON content type? How do I empty an array in JavaScript?

How do I remove a particular element from an array in JavaScript? For-each over an array in JavaScript?GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. Now, jdo2-api You can also directly download file from release page. Now, I had already release hive-third-functions to maven repositories. To add a dependency on hive-third-functions using Maven, use the following:.

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Some useful custom hive udf functions, especial array, json, math, string functions. Java Branch: master.

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Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit 0d87a18 Jan 15, Note: hive-third-functions support hive Build 1.

hive create json array

Positions start with 1. If not found, 0 is returned. The values for each key will be in the same order as they appeared in string. The elements of array must be orderable.

The value ranges from 1 to The index is zero-based.This article uses the following JSON document:. You can copy the file to the default container of your cluster.

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In this article, you use the Apache Hive console. The methods listed in the next section require the JSON document to be composed of a single row. So, you must flatten the JSON document to a string. To flatten the JSON document, run the following script:. Hive provides three different mechanisms to run queries on JSON documents, or you can write your own:.

This method takes two arguments: the table name and method name. Let's look at an example to see how this UDF works. This method takes a set of keys and a JSON string. Then returns a tuple of values. It lets you define the JSON schema, and then you can use the schema to parse the documents. You may also leave feedback directly on GitHub.

Skip to main content. Exit focus mode. Learn at your own pace. See training modules. Dismiss alert. Is this page helpful? Yes No. Any additional feedback? Skip Submit.Despite the popularity of Hadoop and its ecosystem, I've found that much of it is frustratingly underdocumented or at best opaquely documented. An example proof of this is the O'Reilly Programming Hive book, whose authors say they wrote it because so much of Hive is poorly documented and exists only in the heads of its developer community.

Let's start with a simple JSON document and then move to a complex document with nested subdocuments and arrays of subdocuments. We are going to store this as a Text document, so it is best to have the whole JSON entry on a single line in the text file you point the Hive table to. Let's create a Hive table to reference this. I've put the above document in a file called simple. Note: to get the header fields, enter set hive.

This works and has a nice JavaScript like "dotted" notation, but notice that you have to parse the same document once for every field you want to pull out of your JSON document, so it is rather inefficient. It has the benefit of being able to pass in multiple fields, but it only works to a single level deep. It doesn't know how to look inside the Quux subdocument.

So let's turn to a custom SerDe to solve this problem.

hive create json array

To get that SerDe, clone the project from GitHub and run mvn package. It creates a json-serde If you have a place you like to put your jars for runtime referencing move it there. With the openx JsonSerDe, you can define subdocuments as maps or structs.

I prefer structs, as it allows you to use the convenient dotted-path notation e. QuuxId and you can match the case of the fields.

With maps, all the keys you pass in have to be lowercase, even if you defined them as upper or mixed case in your JSON. First let's query something from each document section. Since we know there are two orders in the orders array we can reference them both directly:. But what if we don't know how many orders there are and we want a list of all a user's order Ids?

This will work:. Finally, does the openx JsonSerDe require me to define the whole schema? How constraining is this Hive schema definition? Note that we cannot query for User. PostalCode because we haven't put it on our Hive schema. You would have to revise the schema and then reissue the query.

Creating a schema for a large complex, highly nested JSON document is quite tedious. I am not able to create jar.

Process and analyze JSON documents by using Apache Hive in Azure HDInsight

It looks like rcongiu has updated his SerDe to generate 1.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here. Change your preferences any time.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am trying to create a table which has a complex data type.

And the data types are listed below.

Working With Hive Complex Data Types

I am trying to create a data structure of 3 type. Is it ever possible to create in Hive? My table DDL looks like below. Which is not i am expecting. I don't think this is possible using the inbuilt serde. If you know in advance what the values in your maps are going to be, then I think a better way of approaching this would be to convert your input data to JSON, and then use the Hive json serde :. Though struct allows duplicate key values unlike Map, above query should handle the ask if the data is having unique key values.

Learn more. Asked 4 years, 10 months ago. Active 8 months ago. Viewed 24k times. Abhijeet Chaudhury Abhijeet Chaudhury 21 1 1 gold badge 1 1 silver badge 3 3 bronze badges. Active Oldest Votes. This can be handled with array of structs using the following query. Madhavan Madhavan 11 2 2 bronze badges. Tutu Kumari Tutu Kumari 1 1 silver badge 8 8 bronze badges.

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Hive schemas understand arrays, maps and structs. I prefer to map JSON objects to structs. I say "curated" because you should ensure that every possible key is present with some arbitrary value of the right data type and that all arrays have at least one entry. If the curated JSON example you provide has more than one entry in an array, only the first one will be examinedso you should ensure that it has all the fields.

Creates json-hive-schema I recommend distilling it down to a doc with a single entry in each array and one that has all possible keys filled in - the values don't matter as long as they are present and a type can be determined. So for the curated version of the JSON I've removed one of the entries from the "wobble" array and ensured that the remaining one has all the fields:.

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Java Branch: master. Find file. Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit 23b Sep 21, Build mvn package Creates json-hive-schema JsonHiveSchema file. You signed in with another tab or window. Reload to refresh your session.

hive create json array

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