Hi,
I ask a question because I got curious while reading the manual.
The difference between functions and procedures in apoc is confusing.
User Defined Procedures and Functions - Developer Guides
- Functions are simple computations / conversions and return a single value
- Functions can be used in any expression or predicate
- Procedures are more complex operations and generate streams of results.
- Procedures must be used within the
CALL
clause andYIELD
their result columns - They can generate, fetch or compute data to make it available to later processing steps in your Cypher query
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User-defined procedures - Java Reference
According to those manual, functions in neo4j return only one value, and the cardinality of the main query cannot be increased.
But there is a function(not a procedure) that returns multiple results. allshortestPaths
What's going on here? Is this just one exception?
It may seem like nothing, but it's a big problem for me that the cardinality of the set can change, so I want to hear the exact answer to this.
Thanks