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Document allowed symbolic names

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Reviewers: teon.banek, buda

Reviewed By: teon.banek

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D545
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Mislav Bradac 2017-07-13 14:19:13 +02:00
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docs/user_technical/open-cypher.md
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@ -412,3 +412,25 @@ functions.
`startsWith` | Check if the first argument starts with the second.
`endsWith` | Check if the first argument ends with the second.
`contains` | Check if the first argument has an element which is equal to the second argument.
### Differences
Although we try to implement openCypher query language as closely to the
language reference as possible, we had to make some changes to enhance the
user experience.
#### Symbolic Names
We don't allow symbolic names (variables, label names...) to be openCypher
keywords (WHERE, MATCH, COUNT, SUM...).
#### Matching the Same Edge
We support using the same edge name to match that edge across the whole pattern.
For example:
MATCH ()-[r]-()-[r]-() RETURN r
The above would find the edge `r` which forms a circular connection on a node.
This behaviour is not supported in openCypher reference and the query would
fail.