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Fix Issue 1884: Ambiguous column reference
Fix Issue 1884: Ambiguous column reference and invalid AGT header errors. Note: This PR was created with AI tools and a human, or 2. This commit addresses two related bugs that occur when using SET to store graph elements (vertices, edges, paths) as property values: Issue 1884 - "column reference is ambiguous" error: When a Cypher query uses the same variable in both the SET expression RHS and the RETURN clause (e.g., SET n.prop = n RETURN n), PostgreSQL would report "column reference is ambiguous" because the variable appeared in multiple subqueries without proper qualification. Solution: The fix for this issue was already in place through the target entry naming scheme that qualifies column references. "Invalid AGT header value" offset error: When deserializing nested VERTEX, EDGE, or PATH values stored in properties, the system would fail with errors like "Invalid AGT header value: 0x00000041". This occurred because ag_serialize_extended_type() did not include alignment padding (padlen) in the agtentry length calculation for these types, while fill_agtype_value() uses INTALIGN() when reading, causing offset mismatch. Solution: Modified ag_serialize_extended_type() in agtype_ext.c to include padlen in the agtentry length for VERTEX, EDGE, and PATH cases, matching the existing pattern used for INTEGER, FLOAT, and NUMERIC types: *agtentry = AGTENTRY_IS_AGTYPE | (padlen + (AGTENTRY_OFFLENMASK & ...)); This ensures the serialized length accounts for alignment padding, allowing correct deserialization of nested graph elements. Appropriate regression tests were added to verify the fixes. Co-authored by: Zainab Saad <105385638+Zainab-Saad@users.noreply.github.com> modified: regress/expected/cypher_set.out modified: regress/sql/cypher_set.sql modified: src/backend/parser/cypher_clause.c modified: src/backend/utils/adt/agtype_ext.c
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‎regress/expected/cypher_set.out‎

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@@ -988,6 +988,224 @@ SELECT * FROM cypher('issue_1634', $$ MATCH (u) DELETE (u) $$) AS (u agtype);
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---
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(0 rows)
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--
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-- Issue 1884: column reference is ambiguous when using same variable in
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-- SET expression and RETURN clause
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--
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-- These tests cover:
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-- 1. "column reference is ambiguous" error when variable is used in both
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-- SET expression RHS (e.g., SET n.prop = n) and RETURN clause
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-- 2. "Invalid AGT header value" error caused by incorrect offset calculation
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-- when nested VERTEX/EDGE/PATH values are serialized in properties
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--
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-- Tests use isolated data to keep output manageable and avoid cumulative nesting
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--
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SELECT * FROM create_graph('issue_1884');
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NOTICE: graph "issue_1884" has been created
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create_graph
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--------------
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(1 row)
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-- ============================================================================
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-- Test Group A: Basic "column reference is ambiguous" fix (Issue 1884)
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-- ============================================================================
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-- Test A1: Core issue - SET n.prop = n with RETURN n (the original bug)
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SELECT * FROM cypher('issue_1884', $$
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CREATE (n:TestA1 {name: 'A1'})
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SET n.self = n
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RETURN n
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$$) AS (result agtype);
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result
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----------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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{"id": 844424930131969, "label": "TestA1", "properties": {"name": "A1", "self": {"id": 844424930131969, "label": "TestA1", "properties": {"name": "A1"}}::vertex}}::vertex
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(1 row)
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-- Test A2: Multiple variables in SET and RETURN
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SELECT * FROM cypher('issue_1884', $$
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CREATE (a:TestA2 {name: 'A'})-[e:LINK {w: 1}]->(b:TestA2 {name: 'B'})
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SET a.edge = e, b.edge = e
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RETURN a, e, b
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$$) AS (a agtype, e agtype, b agtype);
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a | e | b
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-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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{"id": 1125899906842625, "label": "TestA2", "properties": {"edge": {"id": 1407374883553281, "label": "LINK", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {"w": 1}}::edge, "name": "A"}}::vertex | {"id": 1407374883553281, "label": "LINK", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {"w": 1}}::edge | {"id": 1125899906842626, "label": "TestA2", "properties": {"edge": {"id": 1407374883553281, "label": "LINK", "end_id": 1125899906842626, "start_id": 1125899906842625, "properties": {"w": 1}}::edge, "name": "B"}}::vertex
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(1 row)
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-- Test A3: SET edge property to node reference
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SELECT * FROM cypher('issue_1884', $$
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CREATE (a:TestA3 {name: 'X'})-[e:REL]->(b:TestA3 {name: 'Y'})
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SET e.src = a, e.dst = b
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RETURN e
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$$) AS (e agtype);
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e
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------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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{"id": 1970324836974593, "label": "REL", "end_id": 1688849860263938, "start_id": 1688849860263937, "properties": {"dst": {"id": 1688849860263938, "label": "TestA3", "properties": {"name": "Y"}}::vertex, "src": {"id": 1688849860263937, "label": "TestA3", "properties": {"name": "X"}}::vertex}}::edge
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(1 row)
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-- ============================================================================
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-- Test Group B: Nested VERTEX/EDGE/PATH serialization (offset error fix)
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-- ============================================================================
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-- Test B1: Vertex nested in vertex property (tests VERTEX serialization)
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SELECT * FROM cypher('issue_1884', $$
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CREATE (n:TestB1 {val: 1})
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SET n.copy = n
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RETURN n
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$$) AS (result agtype);
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result
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----------------------------------------------------------------------------------------------------------------------------------------------------------------------
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{"id": 2251799813685249, "label": "TestB1", "properties": {"val": 1, "copy": {"id": 2251799813685249, "label": "TestB1", "properties": {"val": 1}}::vertex}}::vertex
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(1 row)
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-- Verify nested vertex can be read back
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SELECT * FROM cypher('issue_1884', $$
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MATCH (n:TestB1)
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RETURN n.copy
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$$) AS (copy agtype);
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copy
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-------------------------------------------------------------------------------
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{"id": 2251799813685249, "label": "TestB1", "properties": {"val": 1}}::vertex
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(1 row)
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-- Test B2: Edge nested in node property (tests EDGE serialization)
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SELECT * FROM cypher('issue_1884', $$
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CREATE (a:TestB2 {name: 'start'})-[e:B2REL {x: 100}]->(b:TestB2 {name: 'end'})
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SET a.myEdge = e
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RETURN a
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$$) AS (a agtype);
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a
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--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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{"id": 2533274790395905, "label": "TestB2", "properties": {"name": "start", "myEdge": {"id": 2814749767106561, "label": "B2REL", "end_id": 2533274790395906, "start_id": 2533274790395905, "properties": {"x": 100}}::edge}}::vertex
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(1 row)
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-- Verify nested edge can be read back
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SELECT * FROM cypher('issue_1884', $$
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MATCH (n:TestB2 {name: 'start'})
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RETURN n.myEdge
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$$) AS (edge agtype);
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edge
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--------------------------------------------------------------------------------------------------------------------------------------
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{"id": 2814749767106561, "label": "B2REL", "end_id": 2533274790395906, "start_id": 2533274790395905, "properties": {"x": 100}}::edge
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(1 row)
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-- Test B3: Path nested in node property (tests PATH serialization)
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SELECT * FROM cypher('issue_1884', $$
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CREATE (a:TestB3)-[e:B3REL]->(b:TestB3)
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WITH a, e, b
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MATCH p = (a)-[e]->(b)
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SET a.myPath = p
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RETURN a
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$$) AS (a agtype);
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a
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---
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(0 rows)
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-- Verify nested path can be read back
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SELECT * FROM cypher('issue_1884', $$
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MATCH (n:TestB3)
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WHERE n.myPath IS NOT NULL
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RETURN n.myPath
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$$) AS (path agtype);
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path
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------
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(0 rows)
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-- ============================================================================
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-- Test Group C: Nested structures in arrays and maps
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-- ============================================================================
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-- Test C1: Vertex in array
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SELECT * FROM cypher('issue_1884', $$
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CREATE (n:TestC1 {tag: 'arrtest'})
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SET n.arr = [n]
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RETURN n
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$$) AS (result agtype);
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result
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---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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{"id": 3659174697238529, "label": "TestC1", "properties": {"arr": [{"id": 3659174697238529, "label": "TestC1", "properties": {"tag": "arrtest"}}::vertex], "tag": "arrtest"}}::vertex
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(1 row)
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-- Verify array with nested vertex
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SELECT * FROM cypher('issue_1884', $$
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MATCH (n:TestC1)
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RETURN n.arr[0]
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$$) AS (elem agtype);
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elem
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---------------------------------------------------------------------------------------
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{"id": 3659174697238529, "label": "TestC1", "properties": {"tag": "arrtest"}}::vertex
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(1 row)
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-- Test C2: Vertex in map
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SELECT * FROM cypher('issue_1884', $$
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CREATE (n:TestC2 {tag: 'maptest'})
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SET n.obj = {node: n}
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RETURN n
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$$) AS (result agtype);
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result
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-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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{"id": 3940649673949185, "label": "TestC2", "properties": {"obj": {"node": {"id": 3940649673949185, "label": "TestC2", "properties": {"tag": "maptest"}}::vertex}, "tag": "maptest"}}::vertex
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(1 row)
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-- Verify map with nested vertex
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SELECT * FROM cypher('issue_1884', $$
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MATCH (n:TestC2)
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RETURN n.obj.node
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$$) AS (node agtype);
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node
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---------------------------------------------------------------------------------------
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{"id": 3940649673949185, "label": "TestC2", "properties": {"tag": "maptest"}}::vertex
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(1 row)
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-- ============================================================================
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-- Test Group D: MERGE and CREATE with self-reference
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-- ============================================================================
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-- Test D1: MERGE with SET self-reference
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SELECT * FROM cypher('issue_1884', $$
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MERGE (n:TestD1 {name: 'merged'})
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SET n.ref = n
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RETURN n
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$$) AS (result agtype);
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result
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-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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{"id": 4222124650659841, "label": "TestD1", "properties": {"ref": {"id": 4222124650659841, "label": "TestD1", "properties": {"name": "merged"}}::vertex, "name": "merged"}}::vertex
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(1 row)
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-- Test D2: CREATE with SET self-reference
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SELECT * FROM cypher('issue_1884', $$
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CREATE (n:TestD2 {name: 'created'})
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SET n.ref = n
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RETURN n
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$$) AS (result agtype);
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result
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---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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{"id": 4503599627370497, "label": "TestD2", "properties": {"ref": {"id": 4503599627370497, "label": "TestD2", "properties": {"name": "created"}}::vertex, "name": "created"}}::vertex
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(1 row)
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-- ============================================================================
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-- Test Group E: Functions with variable references
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-- ============================================================================
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-- Test E1: id() and label() functions
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SELECT * FROM cypher('issue_1884', $$
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CREATE (n:TestE1 {name: 'functest'})
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SET n.myId = id(n), n.myLabel = label(n)
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RETURN n
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$$) AS (result agtype);
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result
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----------------------------------------------------------------------------------------------------------------------------------------
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{"id": 4785074604081153, "label": "TestE1", "properties": {"myId": 4785074604081153, "name": "functest", "myLabel": "TestE1"}}::vertex
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(1 row)
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-- Test E2: nodes() and relationships() with path
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SELECT * FROM cypher('issue_1884', $$
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CREATE (a:TestE2)-[e:E2REL]->(b:TestE2)
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WITH a, e, b
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MATCH p = (a)-[e]->(b)
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SET a.pathNodes = nodes(p), a.pathRels = relationships(p)
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RETURN a
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$$) AS (a agtype);
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a
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---
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(0 rows)
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--
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-- Clean up
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--
@@ -1038,6 +1256,33 @@ NOTICE: graph "issue_1634" has been dropped
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(1 row)
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SELECT drop_graph('issue_1884', true);
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NOTICE: drop cascades to 19 other objects
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DETAIL: drop cascades to table issue_1884._ag_label_vertex
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drop cascades to table issue_1884._ag_label_edge
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drop cascades to table issue_1884."TestA1"
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drop cascades to table issue_1884."TestA2"
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drop cascades to table issue_1884."LINK"
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drop cascades to table issue_1884."TestA3"
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drop cascades to table issue_1884."REL"
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drop cascades to table issue_1884."TestB1"
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drop cascades to table issue_1884."TestB2"
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drop cascades to table issue_1884."B2REL"
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drop cascades to table issue_1884."TestB3"
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drop cascades to table issue_1884."B3REL"
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drop cascades to table issue_1884."TestC1"
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drop cascades to table issue_1884."TestC2"
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drop cascades to table issue_1884."TestD1"
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drop cascades to table issue_1884."TestD2"
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drop cascades to table issue_1884."TestE1"
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drop cascades to table issue_1884."TestE2"
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drop cascades to table issue_1884."E2REL"
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NOTICE: graph "issue_1884" has been dropped
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drop_graph
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------------
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(1 row)
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10411286
--
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-- End
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--

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