[PR] Fix entity-projection alias in WITH clause causing MATCH to fail [age]

["waterWang (via GitHub)" <gi...@apache.org>]

waterWang opened a new pull request, #2544:
URL: https://github.com/apache/age/pull/2544

   Fix entity-projection alias in WITH clause causing MATCH to fail
   
   When a vertex variable is renamed via an entity-projection alias in a WITH
   clause (e.g. WITH n AS alias0), a subsequent MATCH (alias0) failed with
   "variable 'alias0' already exists". The alias was created as a target-list
   entry but no transform_entity was registered for the alias name, so
   find_variable could not find it.
   
   Fix: in transform_cypher_node, when te != NULL && entity == NULL but the
   variable is visible as a column from a previous clause (colNameToVar
   returns non-NULL), return the column reference directly instead of
   erroring. The caller creates the transform_entity, allowing subsequent
   clauses to reference the aliased variable.
   
   Fixes #2538


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