擅长:python、mysql、java
<p>这是因为您正在对整个<code>DataFrame</code>对象进行别名,而不是<code>Column</code>。下面是一个如何仅对<code>Column</code>进行别名的示例:</p>
<pre><code>import pyspark.sql.functions as func
grpdf = joined_df \
.groupBy(temp1.datestamp) \
.max('diff') \
.select(func.col("max(diff)").alias("maxDiff"))
</code></pre>