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I have 1 Sphere and 1 Cylinder. I try to join them by boolean. when I Join the cylinder with Sphere, Cylinder behaves weird while sculpting however Sphere seems to be normal. There seems to be some issue of either Clean mesh or Normals. But not sure how to fix that in Blender 2.8. Please helpenter image description here

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    $\begingroup$ Is it necessary to use the boolean? eg To model cylinder with sphere attached could add a uv sphere, choose a latitude edge ring, delete all verts "south" and extrude. $\endgroup$ – batFINGER Dec 11 '19 at 5:50
  • $\begingroup$ Or create and position one with Ctrl+R and then do what batFINGER says. And Ctrl+J is always there. $\endgroup$ – Lukasz-40sth Dec 11 '19 at 7:49
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    $\begingroup$ This looks like Z-fighting. Do you still have the cylinder, as well as the sphere-plus-cylinder, so they're overlapping? $\endgroup$ – user253751 Dec 11 '19 at 17:06
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Just to illustrate batFINGER's point:

Delete faces with Delete > Faces.
Select an edge loop and extrude downwards.

enter image description here

To close the bottom, just Fill and Poke faces.

enter image description here

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You should adjust the Overlap Threshold of Boolean Modifier.

In my case correct Overlap Threshold is from 0.000001 to 0.001: Overlap Threshold of Boolean Modifier

After apply Boolean Modifier sculpt is correct: Sculpted

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