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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.

A data provider is any Snowflake account that creates shares and makes them available to other Snowflake accounts to consume.

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.