{"record":{"id":"a50b808a5a27175c","repo":"apache/iceberg","slug":"failed-to-scan-delegate-parser-in-a50b80","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/v4.2/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/v4.2/spark/src/main/java/org/apache/iceberg/spark/ExtendedParser.java#L81-L111","documentation":"A logged warning emitted when the extended Spark SQL parser cannot reflectively scan a delegate parser to extract its ParserInterface. The code walks the class hierarchy of Spark's parser looking for a delegate field; if reflection fails or an unexpected parser shape is present, the exception is caught, logged, and null is returned, so Spark SQL falls back to the default parser. It indicates the Spark/Iceberg version pairing exposes an internal parser layout this shim does not understand.","triggerScenarios":"Calling findParser/getNextDelegateParser when Spark's SparkSqlParser internals changed such that the expected delegate field is absent or inaccessible — usually after a Spark patch or major version change incompatible with the Iceberg connector.","commonSituations":"Mixing an Iceberg spark-runtime built for one Spark version with a different Spark distribution; Spark internal refactoring of ParserInterface delegates; custom SQL parser plugins that wrap the parser differently.","solutions":["Use an Iceberg Spark connector built for your exact Spark version (e.g., iceberg-spark-runtime-4.2 with Spark 4.2).","Check the exception in the log for IllegalAccessException/NoSuchFieldException to confirm the reflection mismatch.","Remove or align custom parser plugins/SQL extensions that alter the parser delegate chain.","Upgrade the Iceberg connector to a release that supports your Spark version's internal parser layout.","If SQL extensions are not needed, disable spark.sql.extensions to avoid the code path entirely."],"exampleFix":"// before\n-- mismatched jars\nspark.jars.packages org.apache.iceberg:iceberg-spark-runtime-4.1_2.13:1.6.0  // on Spark 4.2\n// after\nspark.jars.packages org.apache.iceberg:iceberg-spark-runtime-4.2_2.13:<matching-version>","handlingStrategy":"fallback","validationCode":"// ensure Spark version matches the connector artifact version\nassert spark.version().startsWith(\"4.2\"); // when using iceberg-spark-runtime-4.2","typeGuard":null,"tryCatchPattern":"// behavior already falls back to the default parser; only investigate if SQL extensions misbehave","preventionTips":["Always match iceberg-spark-runtime artifact to your exact Spark major.minor version","Avoid custom SQL parser plugins unless tested with your connector version","Check Spark internal parser changes before upgrading Spark in place","Enable spark.sql.extensions only when needed"],"tags":["spark","reflection","parser","compatibility"],"backgroundTag":"deprecated-api-usage","analyzedSha":"86d9c8fc543e7c56c9f624eb725f76c9baff9570","analyzedAt":"2026-09-12T00:46:39.097Z","contentChangedAt":"2026-09-12T00:46:39.097Z","schemaVersion":2},"datasetVersion":"2026-09-14T11:17:12.474Z"}