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https://issues.apache.org/jira/browse/SPARK-37325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17448914#comment-17448914
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Hyukjin Kwon commented on SPARK-37325:
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you can use pandas aggregate funciton. for questions, you can ask it in mailing
list.
> Result vector from pandas_udf was not the required length
> ---------------------------------------------------------
>
> Key: SPARK-37325
> URL: https://issues.apache.org/jira/browse/SPARK-37325
> Project: Spark
> Issue Type: Bug
> Components: PySpark
> Affects Versions: 3.2.0
> Environment: 1
> Reporter: liu
> Priority: Major
>
>
> {code:java}
> schema = StructType([
> StructField("node", StringType())
> ])
> rdd = sc.textFile("hdfs:///user/liubiao/KG/graph_dict.txt")
> rdd = rdd.map(lambda obj: {'node': obj})
> df_node = spark.createDataFrame(rdd, schema=schema)
> df_fname =spark.read.parquet("hdfs:///user/liubiao/KG/fnames.parquet")
> pd_fname = df_fname.select('fname').toPandas()
> @pandas_udf(IntegerType(), PandasUDFType.SCALAR)
> def udf_match(word: pd.Series) -> pd.Series:
> my_Series = pd_fname.squeeze() # dataframe to Series
> num = int(my_Series.str.contains(word.array[0]).sum())
> return pd.Series(num)
> df = df_node.withColumn("match_fname_num", udf_match(df_node["node"]))
> {code}
>
> Hi, I have two dataframe, and I try above method, however, I get this
> {code:java}
> RuntimeError: Result vector from pandas_udf was not the required length:
> expected 100, got 1{code}
> it will be really thankful, if there is any helps
>
> PS: for the method itself, I think there is no problem, I create same sample
> data to verify it successfully, however, when I use the real data error came.
> I checked the data, can't figure out,
> does anyone know what it cause?
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