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Currently, external functions cannot be shared with data consumers via Secure Data Sharing.

Currently, external functions must be scalar functions. A scalar external function re-turns a single value for each input row.

External functions have more overhead than internal functions (both built-in functions and internal UDFs) and usually execute more slowly

An external function accessed through an AWS API Gateway private endpoint can be accessed only from a Snowflake VPC (Virtual Private Cloud) on AWS and in the same AWS region.

Reader accounts (formerly known as read-only accounts) provide a quick, easy, and cost-effective way to share data without requiring the consumer to become a Snowflake customer. 

Users in a reader account can query data that has been shared with the reader account, but cannot perform any of the DML tasks that are allowed in a full account, such as data loading, insert, update, and similar data manipulation operations.