如果目标区域包含的行比源多，则源文本将不会重复。
If the destination area contains more rows than the source, the source text will not repeat.
如果转换失败，则源行有错误，该行会写入到源错误行文件。
If a transformation fails, then the source row is in error, and that row is written to the source error rows file.
如果目标表跨多个数据库分区分布，则源表也必须使用相同的分布方法分布。
If the target table is distributed across database partitions, the source table must also be distributed using the same distribution method.
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