These patches:

  # commit 74891ed2
  #
  #  MDEV-11514, MDEV-11497, MDEV-11554, MDEV-11555 - IN and CASE type aggregation problems

  # commit 53499cd1
  #
  # MDEV-31303 Key not used when IN clause has both signed and usigned values

earlier fixed MDEV-18898.

Adding only an MTR case.

	modified:   mysql-test/main/func_in.result
	modified:   mysql-test/main/func_in.test