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The initial implementation of this feature was really unsupportable, because it's relying on the physical size of an on-disk file to carry the relation's populated/unpopulated state, which is at least a modularity violation and could have serious long-term consequences. We could say that an unlogged matview goes to empty on crash, but not everybody likes that definition, so let's just remove the feature for 9.3. We can add it back when we have a less klugy implementation. I left the grammar and tab-completion support for CREATE UNLOGGED MATERIALIZED VIEW in place, since it's harmless and allows delivering a more specific error message about the unsupported feature. I'm committing this separately to ease identification of what should be reverted when/if we are able to re-enable the feature. |
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