Query Binding to a custom parameter in a view

[pascal.fragnoud]

Yes, because your dataset is empty.

@pascal.fragnoud

When you get your query working, you can access a cell from a row quite easily with an expression binding: {view.custom.dataset}[x] where x is the 0-based index of the row.

edit:
If you need to handle empty datasets:

if(len({view.custom.dataset}),
	{view.custom.dataset}[x],
	null
)

This will return the cell at index x if the dataset is not empty, and null if it's empty.