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A relational operator "shrink", developed by José N. Oliveira, is particularly suitable for constructing greedy algorithms from such specifications.
In this paper, we introduce a relational operator that captures, for a given specification R and candidate program P, the functionality delivered by P that is relevant to R. This operator, which we call the projection of P over R (for reasons we explain), has a number of interesting properties, which we explore in this paper.
The user would select the relational operator < and enter the value 1000 in a text box.
This operation adds a selector for an 'attribute' (e.g. name) of the objects and a selector for a relational operator (e.g. contains the substring).
When clicking the drop-down selector for a relational operator, the list of relational operators provided is compatible with the type of the selected attribute.
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A FOREACH operator with a "flatten" clause can expand one input tuple into a tuple list representing a relation on which relational operators can operate.
In many cases, query languages which work with relations or relational operators, follow the declarative programming paradigm, such as SQL.
Pig operators process the whole data set that can be treated as a relation on which relational operators are applied naturally.
Due to the limited resources of the devices, WSAN-based DSMSs are dedicated to specific tasks composed from a fixed set of operations (e.g., relational operators).
Concerning non-blocking operations, traditional WSAN-based DSMSs fix the set of operations that can be applied (typically relational operators).
For instance, STREAM[32] distinguishes streams from relations, where the latter can be handled by classical relational operators.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com