{"record":{"id":"10a10c100a9ed379","repo":"apache/iceberg","slug":"failed-to-scan-delegate-parser-in-10a10c","errorCode":null,"errorMessage":"Failed to scan delegate parser in {}: ","messagePattern":"Failed to scan delegate parser in (.+?): ","errorType":"console","errorClass":null,"httpStatus":null,"severity":"warning","filePath":"spark/v4.0/spark/src/main/java/org/apache/iceberg/spark/ExtendedParser.java","lineNumber":99,"sourceCode":"\n    return null;\n  }\n\n  private static ParserInterface getNextDelegateParser(ParserInterface parser) {\n    try {\n      Class<?> clazz = parser.getClass();\n      while (clazz != null) {\n        for (Field field : clazz.getDeclaredFields()) {\n          field.setAccessible(true);\n          Object value = field.get(parser);\n          if (value instanceof ParserInterface && value != parser) {\n            return (ParserInterface) value;\n          }\n        }\n        clazz = clazz.getSuperclass();\n      }\n    } catch (Exception e) {\n      log().warn(\"Failed to scan delegate parser in {}: \", parser.getClass().getName(), e);\n    }\n\n    return null;\n  }\n\n  private static Logger log() {\n    return LoggerFactory.getLogger(ExtendedParser.class);\n  }\n\n  List<RawOrderField> parseSortOrder(String orderString) throws AnalysisException;\n}\n","sourceCodeStart":81,"sourceCodeEnd":111,"githubUrl":"https://github.com/apache/iceberg/blob/86d9c8fc543e7c56c9f624eb725f76c9baff9570/spark/v4.0/spark/src/main/java/org/apache/iceberg/spark/ExtendedParser.java#L81-L111","documentation":"ExtendedParser in the Spark 4.0 connector wraps Spark's SQL parser to support extended SQL syntax. getNextDelegateParser reflectively scans the delegate parser class hierarchy for an inner ParserInterface value; if reflection fails, this warning is logged and null is returned, so findParser falls back to the standard parsing path.","triggerScenarios":"Calling findParser/getNextDelegateParser when the wrapped Catalyst parser class layout changed (Spark version mismatch) or a SecurityException/ClassCastException occurs during reflective field scanning.","commonSituations":"Running an Iceberg build against a newer/older Spark 4.x than it was compiled for, where ParserInterface fields were reshuffled; restricted classloader environments (some app servers) blocking reflection.","solutions":["Align Spark and Iceberg versions (use the connector artifact built for your exact Spark version).","Inspect the logged exception to see whether it's NoSuchField/Security/CCE and fix accordingly.","If parsing still works via the fallback path, this warning can be tolerated.","If extended SQL features fail, file an issue with the Spark/Iceberg version pair."],"exampleFix":null,"handlingStrategy":"fallback","validationCode":"// Verify version alignment before using extended parser features\nString sparkVersion = org.apache.spark.SPARK_VERSION;\nPreconditions.checkArgument(sparkVersion.startsWith(\"4.0\"),\n    \"ExtendedParser requires Spark 4.0.x, found \" + sparkVersion);","typeGuard":null,"tryCatchPattern":"try {\n  ParserInterface p = ExtendedParser.findParser(delegate);\n} catch (Exception e) {\n  LOG.warn(\"Falling back to standard parser\", e);\n}","preventionTips":["Match Iceberg connector build to exact Spark version","Avoid restrictive classloaders that block reflection","Treat the warning as non-fatal when standard SQL suffices","Report incompatible Spark 4.x patch versions upstream"],"tags":["spark","reflection","parser","version-mismatch"],"backgroundTag":"incompatible-source-type","analyzedSha":"86d9c8fc543e7c56c9f624eb725f76c9baff9570","analyzedAt":"2026-09-12T00:46:39.097Z","contentChangedAt":"2026-09-12T00:46:39.097Z","schemaVersion":2},"datasetVersion":"2026-09-14T16:17:12.679Z"}