There are features such as the Evocation Wizard's Overchannel which states:
Starting at 14th level, you can increase the power of your simpler spells. When you cast a wizard spell of 1st through 5th-level that deals damage, you can deal maximum damage with that spell.
However there are also things such as the Battle Master Fighter's Parry Maneuver which states:
When another creature damages you with a melee attack, you can use your reaction and expend one superiority die to reduce the damage by the number you roll on your superiority die + your Dexterity modifier.
If a Wizard uses Overchannel on a spell does that force the Battle Master to roll a 1 on their superiority die, as this maximizes the spell's damage?
Another example of such a feature is the enlarge/reduce spell which states:
[...] The target's weapons also shrink to match its new size. While these weapons are reduced, the target's attacks with them deal 1d4 less damage [...]
Would the 1d4 reduction be minimized if a Wizard used Overchannel on a spell such as booming blade?