SHOW FUNCTIONS commands: New is_data_metric column

Attention

This behavior change is in the 2023_08 bundle.

For the current status of the bundle, refer to Bundle History.

The behavior of the SHOW FUNCTIONS command is as follows:

Before the change:

The output of the command does not include the is_data_metric column.

After the change:

The output of the command includes the is_data_metric column. This column is a placeholder for future functionality.

Ref: 1248