使用分区修剪的表扫描(TBSCAN)。

Table scan (TBSCAN) with partition pruning.

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取斜分区，修剪一个斜线条与底部不连接。

Cut a round line which disconnected from the bottom by taking diagonal section.

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取定点放射分区，将发片带至第一片修剪三角反曲线层次。

Taking pivot section and over-direct each section to the first and cut a triangular concave technique.

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