in turn would call next() on the selection. The selection operator calls next() on the table scan which outputs the
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这场迁徙，未必宣告“擦边经济”终结，而是开始走向线下生态，用“颜值经济”撬动消费力。
it corresponds to the yield keyword in the nightly-only gen / async gen syntax. Cancelling a call to .next() leaves the stream