Oracle: GRAPH

GRAPH_TABLE is an operator that can be used as a table expression in a from clause.

Graph pattern

The graph pattern starts with the keyword match and is followed by

A path pattern matches a «path» through vertices and edges.

`( … )`	Parantheses match a vertex
`[ … ]`	Square brackets match an edge

The elements of the path patterns are not required to alternate between vertices and edges.

The following semantics apply:

Two consecutive vertex patterns are only allowed if one of the vertex patterns is contained in a parenthesized path pattern while the other one is not. In this case, the vertex patterns bind to the same vertex.
Two consecutive edge patterns conceptually have an implicit vertex pattern between them.

`graph_reference`	The name of the graph that was previously created with the `create property graph` statement.
`graph_pattern`	Vertex and edge patterns, and search conditions. The pattern determines the set of solutions from the graph.
`graph_table_shape`	The final `columns(…)` part projects the solutions to columns (i. e. produces a tabular format suitable for the enclosing `select` statement).