dehowef commented on issue #724:
URL: https://github.com/apache/age/issues/724#issuecomment-1455433949
> This probably is not the bug rather the MATCH clause using same variable
for the two vertices should be used to match _self-loop_ on a vertex.
`MATCH(a)-[]-(a)` and `MATCH(a {prop: "value"})-[]-(a)` would work fine as they
are used for matching the _self-loop_ but `MATCH(a {prop :"value1")-[]-(a {prop
: "value2"})` or `MATCH(a {prop1 : "value1"})-[]-(a {prop2 : "value2"})` would
through an error below as they are not matching any self-loop (because the
properties are different for two vertices)
>
> > ERROR: variable a already exists
When a property constraint is placed on a variable, it is applied to the
variable at hand. `MATCH(a {prop :"value1")-[]-(a {prop : "value2"})` and
`MATCH(a {prop :"value1", prop2 : "value2"})-[]-(a )` are functionally
equivalent and valid queries, what changes is the position with which the
property constraint is being declared. A node can have many properties stored
within them, and the variable declaration, in this case 'a', denotes that they
should be the same vertex within this pattern.
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