Implement Pattern Matching in the WHERE clause

[dehowef]

Currently, the syntax for pattern matching in the WHERE clause is not implemented.

For example, the syntax: MATCH (a) WHERE (a)-[]-() RETURN a

and other similar syntaxes are valid queries and should return a result.

[github-actions[bot]]

This issue is stale because it has been open 45 days with no activity. Remove "Abondoned" label or comment or this will be closed in 7 days.