tools4origins opened a new pull request #24895: [DOC] Fix python variance() documentation URL: https://github.com/apache/spark/pull/24895 ## What changes were proposed in this pull request? The Python documentation incorrectly says that `variance()` acts as `var_pop` whereas it acts like `var_samp` here: https://spark.apache.org/docs/latest/api/python/pyspark.sql.html#pyspark.sql.functions.variance It was not the case in Spark 1.6 doc but it is in Spark 2.0 doc: https://spark.apache.org/docs/1.6.0/api/java/org/apache/spark/sql/functions.html https://spark.apache.org/docs/2.0.0/api/java/org/apache/spark/sql/functions.html The Scala documentation is correct: https://spark.apache.org/docs/latest/api/java/org/apache/spark/sql/functions.html#variance-org.apache.spark.sql.Column- The alias is set on this line: https://github.com/apache/spark/blob/v2.4.3/sql/core/src/main/scala/org/apache/spark/sql/functions.scala#L786 ## How was this patch tested? Usig variance() in pyspark 2.4.3 returns: ``` >>> spark.createDataFrame([(1, ), (2, ), (3, )], "a: int").select(variance("a")).show() +-----------+ |var_samp(a)| +-----------+ | 1.0| +-----------+ ```
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