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Prevent synchronous scan during GIN index build, because GIN is optimized
for inserting tuples in increasing TID order. It's not clear whether thisfully explains Ivan Sergio Borgonovo's complaint, but simple testingconfirms that a scan that doesn't start at block 0 can slow GIN build bya factor of three or four.Backpatch to 8.3. Sync scan didn't exist before that.1 parent3379fae commit10e3acb
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