prestodb/presto · error · PrestoException

GENERIC_INTERNAL_ERROR

GENERIC_INTERNAL_ERROR

Error message

Invalid TableElement: 

What it means

A TableElement in the parsed CREATE TABLE statement was none of ColumnDefinition, LikeClause, or ConstraintSpecification, so internalExecute hit the else branch and raised GENERIC_INTERNAL_ERROR naming the element's class. This indicates an unsupported/unknown table element reached execution — usually an internal inconsistency between the parser/analyzer and this task.

Source

Thrown at presto-main-base/src/main/java/com/facebook/presto/execution/CreateTableTask.java:197

                    includingProperties = true;
                    inheritedProperties = likeTableMetadata.getMetadata().getProperties();
                }

                likeTableMetadata.getColumns().stream()
                        .filter(column -> !column.isHidden())
                        .forEach(column -> {
                            if (columns.containsKey(column.getName())) {
                                throw new SemanticException(DUPLICATE_COLUMN_NAME, element, "Column name '%s' specified more than once", column.getName());
                            }
                            columns.put(column.getName(), column);
                        });
            }
            else if (element instanceof ConstraintSpecification) {
                accessControl.checkCanAddConstraints(session.getRequiredTransactionId(), session.getIdentity(), session.getAccessControlContext(), tableName);
                constraints.add(convertToTableConstraint(metadata, session, connectorId, (ConstraintSpecification) element, warningCollector, query));
            }
            else {
                throw new PrestoException(GENERIC_INTERNAL_ERROR, "Invalid TableElement: " + element.getClass().getName());
            }
        }

        accessControl.checkCanCreateTable(session.getRequiredTransactionId(), session.getIdentity(), session.getAccessControlContext(), tableName);

        constraints.stream()
                .filter(c -> c.getName().isPresent())
                .collect(Collectors.groupingBy(c -> c.getName().get(), Collectors.counting()))
                .forEach((constraintName, count) -> {
                    if (count > 1) {
                        throw new PrestoException(SYNTAX_ERROR, format("Constraint name '%s' specified more than once", constraintName));
                    }
                });

        if (constraints.stream()
                .filter(PrimaryKeyConstraint.class::isInstance)
                .collect(Collectors.groupingBy(c -> c.getName().orElse(""), Collectors.counting()))
                .size() > 1) {

View on GitHub (pinned to 55bb57d202)

Solutions

1. Inspect the class name in the message and confirm which TableElement subtype was sent; remove that syntax from the statement.
2. Check for version mismatch between the client/proxy generating SQL and the server's supported grammar.
3. Report/fix the missing branch: add handling for the element type in CreateTableTask.internalExecute.
4. Retry with a standard CREATE TABLE using only column definitions, LIKE clauses, and constraints.

Example fix

null

for (TableElement element : statement.getElements()) {
    if (!(element instanceof ColumnDefinition || element instanceof LikeClause || element instanceof ConstraintSpecification)) {
        throw new IllegalStateException("Unsupported table element: " + element.getClass().getName());
    }
}

boolean isSupportedTableElement(TableElement e) {
    return e instanceof ColumnDefinition || e instanceof LikeClause || e instanceof ConstraintSpecification;
}

try {
    future = createTableTask.execute(statement, ...);
} catch (PrestoException e) {
    if (e.getErrorCode() == GENERIC_INTERNAL_ERROR.toErrorCode()) {
        log.error("Unhandled TableElement; check parser/server version alignment", e);
    }
}

When it happens

Trigger: Statement's TableElements list contains an element type not handled by the if/else chain in CreateTableTask (e.g. a new AST node added by a plugin/extension or a custom SQL parser).

Common situations: Running a forked or patched Presto where a new TableElement subclass was added to the grammar but not to CreateTableTask; AST incompatibility after upgrading a client that ships its own parser; corrupted statement routing.

Related errors

• TYPE_MISMATCH
• DUPLICATE_COLUMN_NAME
• NOT_SUPPORTED
• SYNTAX_ERROR
• TABLE_ALREADY_EXISTS

AI-assisted analysis of prestodb/presto@55bb57d202 (2026-09-04). Data as JSON: /api/errors/e6c833be0bc40d60. Report an issue: GitHub.