UNWIND , batch and vector, still getting ` Expected float array or ComparableVector as key for vector index, got class java.lang.String`

[ExtReMLapin]

Hello,

Seems to be similar to #3154 (same error)

Not sure which commit was reverted 😕

Query :

UNWIND $batch AS BatchEntry
MATCH (b:CHUNK) WHERE ID(b) = BatchEntry.destRID
CREATE (p:CHUNK_EMBEDDING {vector: BatchEntry.vector})
CREATE (p)-[:embb]->(b)        

Batch sample :

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Database dump :

ORANOOO-backup-20260123-195826576.zip

[lvca]

I have no idea what happened. Let me check it right now...

[lvca]

Same as #3154.

Problem Analysis

The issue was that when using UNWIND with CREATE or MERGE in OpenCypher queries, property references like BatchEntry.vector were being treated as string literals
instead of being evaluated as expressions. This caused nodes to be created with property values like "BatchEntry.vector" (the string) instead of the actual vector
data.

Root Cause

In CypherASTBuilder.visitMap(), property values in CREATE/MERGE clauses were being evaluated immediately using evaluateExpression(), which fell back to returning
the raw text as a string for expressions it couldn't parse. Property access expressions like BatchEntry.vector need to be evaluated at runtime in the context of
the current result row (e.g., after UNWIND has created the variable).

Solution

I implemented a fix in three parts:

1. Modified CypherASTBuilder.visitMap() (engine/src/main/java/com/arcadedb/query/opencypher/parser/CypherASTBuilder.java):
   - Changed to use expressionBuilder.parseExpression() instead of evaluateExpression()
   - For literal values (numbers, strings, booleans), extract the value immediately for backward compatibility
   - For dynamic expressions (property access, variables), keep them as Expression objects for runtime evaluation
   - Added Long-to-Integer conversion for backward compatibility with existing tests
2. Updated CreateStep (engine/src/main/java/com/arcadedb/query/opencypher/executor/steps/CreateStep.java):
   - Modified setProperties() and setPropertiesOnEdge() to handle Expression objects
   - Added expression evaluation in the context of the current result row
   - This allows UNWIND variables to be properly resolved
3. Updated MergeStep (engine/src/main/java/com/arcadedb/query/opencypher/executor/steps/MergeStep.java):
   - Modified evaluateProperties() to handle Expression objects
   - Kept backward compatibility with the existing string-parsing workaround

Testing

• Created comprehensive regression tests in Issue3154Test.java:
  • testUnwindWithCreateSimple() - Simple property references
  • testUnwindWithMergePropertyReferences() - MERGE with property references (issue [New cypher engine] Unwind batch assigns value of object to name of key instead of value #3139)
  • testUnwindWithCreateAndMatch() - UNWIND + MATCH + CREATE combination
  • testUnwindWithCreateVectorProperty() - Vector property handling
  • testOriginalIssue3154Scenario() - Exact scenario from the original issue
• All tests pass (5/5 for Issue3154Test, 257/257 for all OpenCypher tests)

The fix properly handles the original issue where vector embeddings were being stored as string literals instead of actual float arrays, and it applies to both
CREATE and MERGE clauses with UNWIND.