Error: DynamoDB aliasing is not supported

DynamoDB supports attribute-name aliases through ExpressionAttributeNames. An “aliasing is not supported” message therefore needs context: SQL-style result renaming and expression placeholders are different features. Do not remove a required alias for a reserved attribute name.

const params = {
  TableName: "Orders",
  Key: { id: "123" },
  ProjectionExpression: "#state",
  ExpressionAttributeNames: { "#state": "status" }
};
// SDK v3 GetCommand returns Item.status, not Item.state.

An alias substitutes an attribute name inside an API expression; it does not change the attribute name in the returned item. Rename fields in application code when building a response. Map a literal dotted name to one alias, or alias each document-path segment when you intend a nested field.

If the error comes from PartiQL, reproduce the statement using DynamoDB’s documented SELECT syntax without the unsupported alias construct. ExpressionAttributeNames belongs to APIs such as Query and GetItem; it is not a parameter for ExecuteStatement. Without the original statement and client, the exact producer of this wording is not established.

See reserved words and aliases and AWS documentation.