Martin Vogel
2fabaa2b87
fix(cypher): grow the OPTIONAL fallback buffer in the rel cross-join
...
An OPTIONAL MATCH with a relationship, whose start and terminal
variables are not bound by an earlier MATCH and whose start node
pattern matches no node, is joined in cross_join_with_rels() with an
empty candidate list. That path sized its output for a single binding,
but the OPTIONAL fallback then kept one row per existing binding with a
plain indexed store, so every row after the first was written past the
end of the allocation.
Route the fallback through binding_out_append(), the growing writer
that the expansion branch of the same function and the other OPTIONAL
fallbacks already use. The node-only join (cross_join_nodes) was fixed
earlier by sizing its buffer for the fallback rows; the relationship
variant kept the unchecked store.
Add a cypher regression test that runs such a query over four bound
functions and asserts one row per function with the optional variables
unbound. Before this change the test runner reported a
heap-buffer-overflow in cross_join_with_rels under ASan.
Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com >
2026-09-29 02:28:48 +02:00
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