Subtotal nulls and real nulls don't sort like they are supposed to.

[rpbouman]

Subtotals should always sort after the data.
Right now, if the dataset has nulls, the subtotal that has a null at the totalled field may sort before the regular null.
This is not correct.

See:

t.csv

[rpbouman]

This seems easy enoug - just include the grouping id in the ORDER BY of the tuple query.

[rpbouman]

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