Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
1.1k views
in Technique[技术] by (71.8m points)

nosql - Can I add a calculated boolean column to an Elasticsearch Kibana query from data from another query?

Let's imagine that we have an Elastic index and we want to get all the documents of that index and a calculated field with the result of a filtering a different Elastic index.

I will better explain that in SQL code so even if Elastic is NoSQL, I can share the goal:

select id, name, (id IN (select customer_id from invoices where customer_id = 123)) as hasBought
from customers;
question from:https://stackoverflow.com/questions/66047866/can-i-add-a-calculated-boolean-column-to-an-elasticsearch-kibana-query-from-data

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

Elasticsearch doesn't support table joining. You'll need to denormalize your data one way or another, even it results in data duplication. That's the "downside" of NoSQL like ES.

Quoting the docs:

Performing full SQL-style joins in a distributed system like Elasticsearch is prohibitively expensive. Instead, Elasticsearch offers two forms of join which are designed to scale horizontally.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...