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https://issues.apache.org/jira/browse/SPARK-22212?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16194433#comment-16194433
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Apache Spark commented on SPARK-22212:
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User 'jsnowacki' has created a pull request for this issue:
https://github.com/apache/spark/pull/19443
> Some SQL functions in Python fail with string column name
> ----------------------------------------------------------
>
> Key: SPARK-22212
> URL: https://issues.apache.org/jira/browse/SPARK-22212
> Project: Spark
> Issue Type: Bug
> Components: PySpark, SQL
> Affects Versions: 2.2.0
> Reporter: Jakub Nowacki
> Priority: Minor
>
> Most of the functions in {{pyspark.sql.functions}} allow usage of both column
> name string and {{Column}} object. But there are some functions, like
> {{trim}}, that require to pass only {{Column}}. See below code for
> explanation.
> {code}
> >>> import pyspark.sql.functions as func
> >>> df = spark.createDataFrame([tuple(l) for l in "abcde"], ["text"])
> >>> df.select(func.trim(df["text"])).show()
> +----------+
> |trim(text)|
> +----------+
> | a|
> | b|
> | c|
> | d|
> | e|
> +----------+
> >>> df.select(func.trim("text")).show()
> [...]
> Py4JError: An error occurred while calling
> z:org.apache.spark.sql.functions.trim. Trace:
> py4j.Py4JException: Method trim([class java.lang.String]) does not exist
> at
> py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:318)
> at
> py4j.reflection.ReflectionEngine.getMethod(ReflectionEngine.java:339)
> at py4j.Gateway.invoke(Gateway.java:274)
> at
> py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132)
> at py4j.commands.CallCommand.execute(CallCommand.java:79)
> at py4j.GatewayConnection.run(GatewayConnection.java:214)
> at java.lang.Thread.run(Thread.java:748)
> {code}
> This is because most of the Python function calls map column name to Column
> in the Python function mapping, but functions created via
> {{_create_function}} pass them as is, if they are not {{Column}}.
> I am preparing PR with the proposed fix.
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