XiaoyuBD opened a new pull request #566: optimize get metric maps in 'MetricWriteStep' URL: https://github.com/apache/griffin/pull/566 **Why/What changes？** In 'MetricWriteStep.getMetricMaps()' the dataframe was transformed to json rdd, and then collect, and then transformed to Seq[Map]. It's not elegant and hard to understand. More optimized way is to collect it first, and then transform it to Seq[Map] directly. **How was this patch tested?** Griffin test suite.
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