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I just started using Memgraph and I sometimes encounter the error message: "Not yet implemented: atom expression" . First I observed it when trying to use the neo4j-OGM and now I encounter it when checking for relations in a query.

My query looks like this:

memgraph> match(n {nameAST: "CallExpression"}) 
match(m) where not (n)-[:CG]->(m) and m.nameParseTree =~ n.nameParseTree 
return n;
Client received exception: Not yet implemented: atom expression '(n)-[:CG]->(m)'

Any help here? How can I circumvent this error?

Stanislav Kralin
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An Martin
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1 Answers1

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Patterns in expressions are supported in Memgraph in particular functions, like exists(pattern). In other cases, Memgraph does not yet support patterns in functions and that's why you get this error.

But there is a quick fix to avoid this error - use OPTIONAL MATCH instead. Check out patters in expressions in Memgraph's docs and let me know if you managed to fix it

MPesi
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