functions.py 文件源码

def posexplode(col):
    """Returns a new row for each element with position in the given array or map.

    >>> from pyspark.sql import Row
    >>> eDF = spark.createDataFrame([Row(a=1, intlist=[1,2,3], mapfield={"a": "b"})])
    >>> eDF.select(posexplode(eDF.intlist)).collect()
    [Row(pos=0, col=1), Row(pos=1, col=2), Row(pos=2, col=3)]

    >>> eDF.select(posexplode(eDF.mapfield)).show()
    +---+---+-----+
    |pos|key|value|
    +---+---+-----+
    |  0|  a|    b|
    +---+---+-----+
    """
    sc = SparkContext._active_spark_context
    jc = sc._jvm.functions.posexplode(_to_java_column(col))
    return Column(jc)