Add amnblocks index AM method - #78
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RelationGetNumberOfBlocksInFork called smgrnblocks, which returned 0 for Orioledb indexes. The planner read relpages from this, so index scan/bitmap index scan or seq scan were preferred to IOS amnblocks lets the AM override the block count before the smgr fallback.
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RelationGetNumberOfBlocksInFork called smgrnblocks, which returned 0 for Orioledb indexes. The planner read relpages from this, so index scan/bitmap index scan or seq scan were preferred to IOS
amnblocks lets the AM override the block count before the smgr fallback.