The match statement is semantically incompatible with the openCypher standard for Trail.

[Salieri-004]

As we discussed before in the Nebula community, in the openCypher standard, MATCH (m)-[]->(n), (n)-[]->(l) and MATCH (m)-[]->(n)-[]->(l) are equivalent and not equivalent to MATCH (m)-[]->(n) MATCH (n)-[]->(l). However, in the Nebula implementation, since the execution plan is generated according to a single comma-separated path, the Traverse operator determines and eliminates the duplication of edges only for the single comma-separated path, so that MATCH (m)-[]->(n), (n)-[]->(l) and MATCH (m)-[]->(n) MATCH (n)-[]->(l) are equivalent in Nebula, but not equivalent to MATCH (m)-[]->(n)-[]->(l).