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频数分布通过UDTF合并2个udf的性能优化 #52

@hellozepp

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@hellozepp

经排查,发现2个udf比较耗时,代码如下:

    val find_patterns_udf = udf(find_patterns(_))
    val find_alternative_pattern_udf = udf(find_alternativePatterns(_))

需要帮忙看下,2个udf改为一个udtf会不会提升性能

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