A party member in a D&D 5e game I'm in is playing a halfling paladin. It occurred to me (for whatever reason) to ask what weapon they were wielding, and they said their main weapon was a maul, and their backup was a warhammer/shield combo). Upon checking the weapons table, I discovered that mauls have the "Heavy" property, which is described as follows in the Player's Basic Rules/PHB/elsewhere:
Heavy. Small creatures have disadvantage on attack rolls with heavy weapons. A heavy weapon’s size and bulk make it too large for a Small creature to use effectively.
The player seemed to be unaware of this (a similar character in Critical Role apparently wielded heavy weapons without issue - of course, CR is not necessarily a perfect demonstration of the rules as written).
As such, I was curious whether there is anything in the rules (i.e. not homebrew or a house rule) that cancels out this innate disadvantage for player characters, other than gaining advantage from some other source in combat.
(Note: the issue has already been resolved in our game between the player and DM, so it's purely a rules question.)