prestodb/presto · error · PrestoException

NOT_SUPPORTED

NOT_SUPPORTED

Error message

Unsupported iceberg content type: ${fileContent}

What it means

FileContent.fromIcebergFileContent converts the Iceberg API's FileContent enum to Presto's own enum; an unrecognized content type (e.g. a newer spec constant this build does not map, such as an unexpected switch default) triggers this NOT_SUPPORTED error, indicating a file written with a newer Iceberg content kind.

Source

Thrown at presto-iceberg/src/main/java/com/facebook/presto/iceberg/FileContent.java:61

    public static FileContent fromIcebergFileContent(org.apache.iceberg.FileContent fileContent)
    {
        // The DELETION_VECTOR enum constant was introduced in newer
        // iceberg-api releases (V3 spec) and may not be present at compile
        // time when building against older iceberg-api. Use name() string
        // comparison so this code compiles + runs against any version that
        // ships at least DATA/POSITION_DELETES/EQUALITY_DELETES.
        switch (fileContent) {
            case DATA:
                return DATA;
            case POSITION_DELETES:
                return POSITION_DELETES;
            case EQUALITY_DELETES:
                return EQUALITY_DELETES;
            default:
                if ("DELETION_VECTOR".equals(fileContent.name())) {
                    return DELETION_VECTOR;
                }
                throw new PrestoException(NOT_SUPPORTED, "Unsupported iceberg content type: " + fileContent);
        }
    }
}

View on GitHub (pinned to 55bb57d202)

Solutions

1. Upgrade Presto to a version that maps the new Iceberg file content type
2. Exclude or clean files of the unsupported content type from the table if possible

When it happens

Trigger: Thrown at presto-iceberg/src/main/java/com/facebook/presto/iceberg/FileContent.java:61 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

Background: Presto NOT_SUPPORTED error: what "not supported" means and how to fix it — this error's family across 3 libraries.

AI-assisted analysis of prestodb/presto@55bb57d202 (2026-09-04). Data as JSON: /api/errors/52e3304da207bb23. Report an issue: GitHub.