count （GroupedData）

计算每个组的记录数。

Syntax

count()

退货

DataFrame

示例

df = spark.createDataFrame(
    [(2, "Alice"), (3, "Alice"), (5, "Bob"), (10, "Bob")], ["age", "name"])

df.groupBy(df.name).count().sort("name").show()
# +-----+-----+
# | name|count|
# +-----+-----+
# |Alice|    2|
# |  Bob|    2|
# +-----+-----+