Viewing Projection and Column Metadata
In the Management Console EXPLAIN window, when query paths are expanded in the Path Information view, Projection lines contain a projection name and Materialize lines contain one or more column names.
To view metadata for a projection or a column, click the object name. A pop-up window displays the metadata. The following image on the left shows example projection metadata and the image on the right shows example column metadata.
Note: Most system tables do not have metadata.
When you are done viewing the metadata, close the pop-up window.