通过将值追加到现有数组来返回新的数组列。
Syntax
from pyspark.sql import functions as sf
sf.array_append(col, value)
参数
| 参数 | 类型 | Description |
|---|---|---|
col |
pyspark.sql.Column 或 str |
包含数组的列的名称。 |
value |
任意 | 要追加到数组中的文本值或 Column 表达式。 |
退货
pyspark.sql.Column：追加 value 到原始数组的新数组列。
例子
示例 1：将列值追加到数组列
from pyspark.sql import Row, functions as sf
df = spark.createDataFrame([Row(c1=["b", "a", "c"], c2="c")])
df.select(sf.array_append(df.c1, df.c2)).show()
+--------------------+
|array_append(c1, c2)|
+--------------------+
| [b, a, c, c]|
+--------------------+
示例 2：将数值追加到数组列
from pyspark.sql import functions as sf
df = spark.createDataFrame([([1, 2, 3],)], ['data'])
df.select(sf.array_append(df.data, 4)).show()
+---------------------+
|array_append(data, 4)|
+---------------------+
| [1, 2, 3, 4]|
+---------------------+
示例 3：将 null 值追加到数组列
from pyspark.sql import functions as sf
df = spark.createDataFrame([([1, 2, 3],)], ['data'])
df.select(sf.array_append(df.data, None)).show()
+------------------------+
|array_append(data, NULL)|
+------------------------+
| [1, 2, 3, NULL]|
+------------------------+
示例 4：将值追加到 NULL 数组列
from pyspark.sql import functions as sf
from pyspark.sql.types import ArrayType, IntegerType, StructType, StructField
schema = StructType([
StructField("data", ArrayType(IntegerType()), True)
])
df = spark.createDataFrame([(None,)], schema=schema)
df.select(sf.array_append(df.data, 4)).show()
+---------------------+
|array_append(data, 4)|
+---------------------+
| NULL|
+---------------------+
示例 5：将值追加到空数组
from pyspark.sql import functions as sf
from pyspark.sql.types import ArrayType, IntegerType, StructType, StructField
schema = StructType([
StructField("data", ArrayType(IntegerType()), True)
])
df = spark.createDataFrame([([],)], schema=schema)
df.select(sf.array_append(df.data, 1)).show()
+---------------------+
|array_append(data, 1)|
+---------------------+
| [1]|
+---------------------+