{"record":{"id":"f22538e20a41b136","repo":"t8y2/dbx","slug":"hiveserver2-table-comment-metadata-failed-v-ta","errorCode":null,"errorMessage":"HiveServer2 table comment metadata failed (%v); table listing fallback failed: %w","messagePattern":"HiveServer2 table comment metadata failed \\((.+?)\\); table listing fallback failed: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"agents/drivers/argo-go/metadata.go","lineNumber":660,"sourceCode":"\t\t\tIsNullable: true,\n\t\t\tComment:    comment,\n\t\t})\n\t}\n\treturn values, nil\n}\n\nfunc (server *server) getTableComment(schema, table string) (*string, error) {\n\tif strings.TrimSpace(table) == \"\" {\n\t\treturn nil, errors.New(\"table is required\")\n\t}\n\tschema = firstNonEmpty(schema, server.config.Database)\n\tmetadataResult, err := server.hiveMetadata(func(ctx context.Context, provider gohive.MetadataProvider) (gohive.MetadataResult, error) {\n\t\treturn provider.GetHiveTables(ctx, schema, table, nil)\n\t})\n\tif err != nil {\n\t\ttables, listErr := server.listTables(schema, metadataListConstraints{Filter: table})\n\t\tif listErr != nil {\n\t\t\treturn nil, fmt.Errorf(\"HiveServer2 table comment metadata failed (%v); table listing fallback failed: %w\", err, listErr)\n\t\t}\n\t\tfor _, candidate := range tables {\n\t\t\tif strings.EqualFold(candidate.Name, table) {\n\t\t\t\treturn candidate.Comment, nil\n\t\t\t}\n\t\t}\n\t\treturn nil, nil\n\t}\n\trows := newHiveMetadataRows(metadataResult)\n\tfor _, row := range rows.rows {\n\t\tif strings.EqualFold(metadataString(rows.value(row, \"TABLE_NAME\")), table) {\n\t\t\treturn optionalString(metadataString(rows.value(row, \"REMARKS\", \"COMMENT\"))), nil\n\t\t}\n\t}\n\treturn nil, nil\n}\n\nfunc (server *server) listDataTypes() ([]string, error) {","sourceCodeStart":642,"sourceCodeEnd":678,"githubUrl":"https://github.com/t8y2/dbx/blob/c0390bff16418b651f4728520d99adf8ce48829a/agents/drivers/argo-go/metadata.go#L642-L678","documentation":"When fetching a table's comment, the driver tries the HiveServer2 metadata provider (GetHiveTables) and, if that fails, falls back to listTables with a name filter to read the comment from the listing result. This error is returned when both the metadata call and the table-listing fallback fail, wrapping each cause.","triggerScenarios":"Reading a table comment when GetHiveTables errors AND the SHOW TABLES-based listTables fallback with the Filter set also errors — commonly for nonexistent tables or users without list privileges on the schema.","commonSituations":"Nonexistent or misspelled table name; schema-level permission restrictions; HiveServer2 session or metadata outage affecting both paths simultaneously.","solutions":["Confirm the table name (case-insensitive match is used against the fallback listing) exists in the schema.","Check the user's privileges to list tables in the target schema.","Inspect the (%v) cause for the primary metadata failure and address it (often session or permission related).","Retry after reconnecting if the HiveServer2 instance was temporarily unavailable."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":"// Confirm the table is listed in the schema before reading its comment.\ntables, err := server.listTables(schema, metadataListConstraints{})\nif err == nil {\n    found := false\n    for _, t := range tables {\n        if strings.EqualFold(t.Name, table) {\n            found = true\n            break\n        }\n    }\n    if !found {\n        return nil, fmt.Errorf(\"table %q not found in schema %q; comment lookup skipped\", table, schema)\n    }\n}","typeGuard":null,"tryCatchPattern":"comment, err := server.tableComment(schema, table)\nif err != nil {\n    if errors.Is(err, errTableNotFound) || strings.Contains(err.Error(), \"table listing fallback failed\") {\n        return \"\", nil // treat missing/inaccessible table comment as empty\n    }\n    return \"\", fmt.Errorf(\"table comment unavailable: %w\", err)\n}","preventionTips":["Check the user can list tables in the schema before attempting comment reads.","Match table names case-insensitively, as the driver's fallback uses strings.EqualFold.","Handle empty comments gracefully — tables may legitimately have no COMMENT set.","Verify HiveServer2 metadata service health if both the primary and fallback calls fail together."],"tags":["hive","metadata","table-comment","fallback"],"backgroundTag":"metadata-query-failed","analyzedSha":"c0390bff16418b651f4728520d99adf8ce48829a","analyzedAt":"2026-09-05T23:05:10.900Z","contentChangedAt":"2026-09-05T23:05:10.900Z","schemaVersion":2},"datasetVersion":"2026-09-14T05:17:10.506Z"}