W3SparqlRecursivePath test failure (hashtag2750)

[vikramsubramanian]

check the following under rdf/w3_sparql/path.test

hashtag TODO(Guodong): The following read fails reading correct iri.
hashtag-STATEMENT MATCH (a)-[* (r, n | WHERE r.iri = "x")]->(b)
hashtag        RETURN COUNT(*);
hashtag---- 1

At high level, I'm not getting the correct iri for a given internal id. This bug doesn't appear in a sequential scan but instead appears in lookup. )

[mayil-ai[bot]]

Summary: Incorrect IRI retrieval for a given internal ID in W3SparqlRecursivePath test.

Possible Solution

Based on the provided information, the issue seems to be related to the incorrect reading of an IRI during a lookup operation in a recursive path query. The expected result of the count is 1, but the test W3SparqlRecursivePath is failing, indicating that the actual result might be different.

To address the issue, follow these steps:

• Locate the function or method responsible for handling the lookup operation during the recursive path query in the codebase. This function should be involved in filtering by iri within a recursive path.
• Verify that the iri comparison logic is correctly implemented. Ensure that the iri value "x" is being matched exactly and case-sensitively.
• Check if the iri values are being correctly decoded and compared. If the iri values are encoded or transformed in any way before comparison, ensure that the decoding or transformation logic is correct.
• Ensure that the recursive path query correctly handles the WHERE clause and applies the filter to each relationship (r) in the path.
• Review the test case hashtag2750 and any associated TODO comments from Guodong for additional context or clues about the issue.
• If the issue persists, add logging or debugging statements around the iri lookup operation to trace the execution flow and identify where the mismatch occurs.
• After making changes, run the W3SparqlRecursivePath test again to ensure that the issue is resolved and the expected result of 1 is obtained.

If the issue is not resolved with the above steps, consider reviewing related components such as index scans or filters that might affect the outcome of the MATCH clause.

Code snippets to check

• test/optimizer/optimizer_test.cpp

  The issue mentions a failure in a recursive path test, and this file contains tests related to recursive joins and path queries, which could be directly related to the issue.

• test/main/prepare_test.cpp

  This file contains tests for prepared statements with parameterized queries, which might be relevant if the issue is related to query execution involving parameters.

• test/main/result_value_test.cpp

  This file contains tests for result values and exceptions, which might be relevant if the issue is related to incorrect results or error handling in query results.

• third_party/serd/src/n3.c

  The issue mentions incorrect IRI reading, and this file contains functions for reading IRIs, which could be the source of the bug.