python - 将新行添加到 pyspark Dataframe

Question

我是 pyspark 的新手，但对 pandas 很熟悉。 我有一个 pyspark 数据框

# instantiate Spark
spark = SparkSession.builder.getOrCreate()

# make some test data
columns = ['id', 'dogs', 'cats']
vals = [
     (1, 2, 0),
     (2, 0, 1)
]

# create DataFrame
df = spark.createDataFrame(vals, columns)

想要添加新行 (4,5,7) 以便输出:

df.show()
+---+----+----+
| id|dogs|cats|
+---+----+----+
|  1|   2|   0|
|  2|   0|   1|
|  4|   5|   7|
+---+----+----+

Answer 1

作为thebluephantom已经说过联合是要走的路。我只是回答你的问题，给你一个 pyspark 的例子:

# if not already created automatically, instantiate Sparkcontext
spark = SparkSession.builder.getOrCreate()

columns = ['id', 'dogs', 'cats']
vals = [(1, 2, 0), (2, 0, 1)]

df = spark.createDataFrame(vals, columns)

newRow = spark.createDataFrame([(4,5,7)], columns)
appended = df.union(newRow)
appended.show()

另请查看数据 block 常见问题解答:https://kb.databricks.com/data/append-a-row-to-rdd-or-dataframe.html