I couldn't find anything in the specification on this, but is there any
constraint on how disallowed ordering of encoded pages in a column for a
row group.

I think in practice most types try to dictionary encode first and then
fallback to another encoding if the dictionary doesn't yield benefits or
grows too big.  But in theory is an ordering of pages described below
possible:

1. Dictionary Encoded Page
2. Plain Encoded Page
3. Dictionary Encoded Page

Thanks,
Micah

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