HyukjinKwon commented on issue #23882: [SPARK-26979][PYTHON] Add missing string column name support for some SQL functions URL: https://github.com/apache/spark/pull/23882#issuecomment-473756127 Why was `ascii` in string function an exception? ```python >>> spark.range(1).select(lit('a').alias("value")).select(ascii(col("value"))).show() ``` ``` +------------+ |ascii(value)| +------------+ | 97| +------------+ ``` ```python >>> spark.range(1).select(lit('a').alias("value")).select(ascii("value")).show() ``` ``` Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/.../spark/python/pyspark/sql/functions.py", line 51, in _ jc = getattr(sc._jvm.functions, name)(col._jc if isinstance(col, Column) else col) File "/.../spark/python/lib/py4j-0.10.8.1-src.zip/py4j/java_gateway.py", line 1286, in __call__ File "/.../spark/python/pyspark/sql/utils.py", line 63, in deco return f(*a, **kw) File "/.../spark/python/lib/py4j-0.10.8.1-src.zip/py4j/protocol.py", line 332, in get_return_value py4j.protocol.Py4JError: An error occurred while calling z:org.apache.spark.sql.functions.ascii. Trace: py4j.Py4JException: Method ascii([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:276) at py4j.commands.AbstractCommand.invokeMethod(AbstractCommand.java:132) at py4j.commands.CallCommand.execute(CallCommand.java:79) at py4j.GatewayConnection.run(GatewayConnection.java:238) at java.lang.Thread.run(Thread.java:748) ```
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