zhengruifeng opened a new pull request, #43930:
URL: https://github.com/apache/spark/pull/43930
### What changes were proposed in this pull request?
Make `Column.__getitem__` accept input column
### Why are the changes needed?
`Column.__getitem__` should accept column as input
```
In [1]: from pyspark.sql.functions import col,lit,create_map
...: from itertools import chain
...:
...: mapping = {
...: 'A': '20',
...: 'B': '28',
...: 'C': '34'
...: }
...:
...: x = [['A','10'],['B','14'],['C','17']]
...: df = spark.createDataFrame(data=x, schema = ["key", "value"])
...:
...: mapping_expr = create_map([lit(x) for x in chain(*mapping.items())])
...: df = df.withColumn("square_value", mapping_expr[col("key")])
...: df.show()
---------------------------------------------------------------------------
PySparkTypeError Traceback (most recent call last)
Cell In[1], line 14
11 df = spark.createDataFrame(data=x, schema = ["key", "value"])
13 mapping_expr = create_map([lit(x) for x in chain(*mapping.items())])
---> 14 df = df.withColumn("square_value", mapping_expr[col("key")])
15 df.show()
File ~/Dev/spark/python/pyspark/sql/connect/column.py:465, in
Column.__getitem__(self, k)
463 return self.substr(k.start, k.stop)
464 else:
--> 465 return Column(UnresolvedExtractValue(self._expr,
LiteralExpression._from_value(k)))
File ~/Dev/spark/python/pyspark/sql/connect/expressions.py:336, in
LiteralExpression._from_value(cls, value)
334 @classmethod
335 def _from_value(cls, value: Any) -> "LiteralExpression":
--> 336 return LiteralExpression(value=value,
dataType=LiteralExpression._infer_type(value))
File ~/Dev/spark/python/pyspark/sql/connect/expressions.py:329, in
LiteralExpression._infer_type(cls, value)
323 raise PySparkTypeError(
324 error_class="CANNOT_INFER_ARRAY_TYPE",
325 message_parameters={},
326 )
327 return ArrayType(LiteralExpression._infer_type(first), True)
--> 329 raise PySparkTypeError(
330 error_class="UNSUPPORTED_DATA_TYPE",
331 message_parameters={"data_type": type(value).__name__},
332 )
PySparkTypeError: [UNSUPPORTED_DATA_TYPE] Unsupported DataType `Column`.
```
### Does this PR introduce _any_ user-facing change?
yes
### How was this patch tested?
added ut
### Was this patch authored or co-authored using generative AI tooling?
no
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