jrgemignani opened a new pull request, #1442:
URL: https://github.com/apache/age/pull/1442
Fixed issue 1219 where MERGE did not see the previous clause's variable.
This description is a bit misleading as the transform phase did see the
variable and was able to use it. However, the planner phase removed the
variable by replacing it with a NULL Const. This caused MERGE to see a NULL
Const for the previous tuple, generating incorrect results. However, this only
occurred for very specific cases.
Fx: MATCH (x) MERGE (y {id: id(x)}) -- worked
MATCH (x) MERGE (y {id: id(x)}) RETURN y -- didn't
MATCH (x) MERGE (y {id: id(x)}) RETURN x, y -- worked
The change impacted no current regression tests and involved wrapping all
explicitly defined variables' target entries with a volatile wrapper.
Added new regression tests.
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