apache/seatunnel · error · UnsupportedOperationException

Unsupported action type:

Error message

Unsupported action type: 

What it means

MilvusCatalog.previewAction computes a human-readable preview for supported catalog actions (create/drop table/collection, create/drop database). An ActionType outside these branches throws UnsupportedOperationException with 'Unsupported action type: <action>'. This is a completeness guard, meaning the preview feature does not cover that action.

Source

Thrown at seatunnel-connectors-v2/connector-milvus/src/main/java/org/apache/seatunnel/connectors/seatunnel/milvus/catalog/MilvusCatalog.java:127

    @Override
    public String name() {
        return catalogName;
    }

    @Override
    public PreviewResult previewAction(
            ActionType actionType, TablePath tablePath, Optional<CatalogTable> catalogTable) {
        if (actionType == ActionType.CREATE_TABLE) {
            return new InfoPreviewResult("create collection " + tablePath.getTableName());
        } else if (actionType == ActionType.DROP_TABLE) {
            return new InfoPreviewResult("drop collection " + tablePath.getTableName());
        } else if (actionType == ActionType.CREATE_DATABASE) {
            return new InfoPreviewResult("create database " + tablePath.getDatabaseName());
        } else if (actionType == ActionType.DROP_DATABASE) {
            return new InfoPreviewResult("drop database " + tablePath.getDatabaseName());
        } else {
            throw new UnsupportedOperationException("Unsupported action type: " + actionType);
        }
    }

    @Override
    public String getDefaultDatabase() throws CatalogException {
        return "default";
    }

    @Override
    public boolean databaseExists(String databaseName) throws CatalogException {
        List<String> databases = this.listDatabases();
        return databases.contains(databaseName);
    }

    @Override
    public List<String> listDatabases() throws CatalogException {
        R<ListDatabasesResponse> response = this.client.listDatabases();
        return response.getData().getDbNamesList();

View on GitHub (pinned to cf67b549a7)

Solutions

1. Only invoke previewAction with actions Milvus supports (create/drop table, create/drop database).
2. Extend MilvusCatalog.previewAction with a branch for the missing ActionType if it is a legitimate new action.
3. Check the SeaTunnel version: update Milvus connector to a release where the missing action is handled.

Example fix

// before
throw new UnsupportedOperationException("Unsupported action type: " + actionType);
// after
} else if (actionType == ActionType.TRUNCATE_TABLE) {
    return new InfoPreviewResult("truncate collection " + tablePath.getTableName());
} else {
    throw new UnsupportedOperationException("Unsupported action type: " + actionType);

if (actionType != ActionType.CREATE_TABLE && actionType != ActionType.DROP_TABLE
    && actionType != ActionType.CREATE_DATABASE && actionType != ActionType.DROP_DATABASE) {
    throw new IllegalArgumentException("Milvus catalog does not support preview for " + actionType);
}

boolean isPreviewableByMilvus(ActionType t) {
    return t == ActionType.CREATE_TABLE || t == ActionType.DROP_TABLE
        || t == ActionType.CREATE_DATABASE || t == ActionType.DROP_DATABASE;
}

try {
    result = milvusCatalog.previewAction(tablePath, actionType);
} catch (UnsupportedOperationException e) {
    log.warn("No preview available for {} on Milvus: {}", actionType, e.getMessage());
    result = new InfoPreviewResult("(preview unsupported for " + actionType + ")");
}

When it happens

Trigger: Calling catalog.previewAction(tablePath, actionType) with an ActionType not handled by MilvusCatalog (e.g. a newer action enum added by the catalog API that Milvus has no preview branch for, or a caller passing an unexpected action).

Common situations: Future-facing catalog code invoking preview with action types added after this Milvus implementation was written; plugin/framework callers enumerating all ActionType values against catalogs that don't support all of them.

Related errors

• Unsupported action type: {actionType}
• Unsupported action type: ${actionType}
• Hudi catalog not support truncate table.
• Unsupported action type:
• Unsupported action type: ${actionType}

AI-assisted analysis of apache/seatunnel@cf67b549a7 (2026-09-10). Data as JSON: /api/errors/4a37671dd0a78497. Report an issue: GitHub.