Source: The Great Interpretation of Dreams (Ibn Sirin)
Breaking a pillar in a dream indicates the death of the one it represents (like the leader, father, or religion).
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Breaking a pillar indicates the death of the ruler, father, or husband.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Breaking a pillar is interpreted as worry and calamity.