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Thanks for @agentm 's opinion, in order to explore more practical usage from relational algebra, we may need
> a new type and processing engine for converting Relations to DataFrames akin to panda…
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What are the basic operators for modern analytical queries?
How to model IO operations to make them portable on various storage engine?
What can be expected from a model much stronger than naive rel…
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This is reading from the first chapter of [Redbook](http://www.redbook.io/index.html)
Stonebraker summarizes 35 years of **data model** proposals, grouped into 9 eras.
1. Hierarchical (IMS) : stri…
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[Substrait](https://substrait.io/) describes itself as **Substrait: Cross-Language Serialization for Relational Algebra** and its vision is to:
> Create a well-defined, cross-language [specificatio…
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### Hjälpämnet (name) utelämnas helt:
(Kanske är din mening)
```
:
A user defined function (or definition).
Evaluate function name as a macro and return the resulting string.
Argum…
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I started working on a direct [port](https://github.com/TheKidCoder/Arel.cr) of AREL (A Relational Algebra) for building SQL queries using an AST. I mainly started it as an experiment to see what it w…
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```
-- https://pdfs.semanticscholar.org/6f33/978012f794cc5fff60506db730e6a15185e7.pdf -- Introduction to Kleene Algebra Lecture 7, Equational Theory of Kleene Algebra
-- https://pdfs.semanticschola…
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Create vmhost scapes for:
- awake/asleep receptors (maybe)
- elapsed CPU use (see #37)
where the data source is the receptor, and the key source is the element in the Receptor State symbol
zippy updated
8 years ago
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Strang's Linear Algebra and Its Applications (Fourth Edition) says:
> "In fact, there is only one possible rule [for matrix multiplication], and I am not sure who discovered it. It makes everything…
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## Bug Description
We see a lot of WARN log messages in `dspace.log`
```
org.dspace.discovery.SolrServiceImpl @ We have a collection or community admin with ID: without any administrable colle…