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Specifying Cypher constraints#166

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Commits on Jul 1, 2021

• Add the constraints CIP

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• Add property existence constraint syntax

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• Introduce the concept of domain

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• Add example for existence constraint

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• Add SQL examples

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• Update standardisation scope

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• Add grammar rules for new constraint syntax

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• Edited the textual contents of the CIP

  

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• More textual edits to the Constraints CIP

  

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• Amended w3 reference to denote alterations in 'quoted' text

  

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• Rework CIP

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• Remove Motivation section

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• Move Mutability and Name sections

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• Add cross-links

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• Add example for CIR-2017-172

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• Support arbitrary patterns

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• Introduce PRIMARY KEY constraint predicate

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• Rename constraint operator to NODE KEY

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• Use ADD for constraint creation

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• Add specification for the return record

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• Add tests verifying NODE KEY works in grammar

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• Reformatted title

  

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• Use CREATE instead of ADD

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• Make textual clarifications

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• Update grammar to use CREATE

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• Add missing semicolons in BNF syntax

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• Specify limitations on constraint expressions

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• Add ability to specify multiple constraints in one statement

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• Add example for plural syntax

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• Explain usage of term 'constraint expression'

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• Use two blank lines before new section

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Commits on Jul 2, 2021

• Remove notion about creating multiple constraints

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• Update grammar definition

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• Prefer element over entity

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• Update uniqueness to use IS UNIQUE operator

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• Update node key to use IS NODE KEY operator

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• Define a grouped expression and its type

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• Prefer IS NOT NULL over exists()

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• Stylistic improvements of examples

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• Add analysis of discarded alternatives

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• Update openCypher grammar description

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• Specify NODE and KEY as symbolic names, not reserved words

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