Maciej Szymkiewicz created SPARK-19453:
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Summary: Correct
Key: SPARK-19453
URL: https://issues.apache.org/jira/browse/SPARK-19453
Project: Spark
Issue Type: Improvement
Components: Documentation, PySpark, SQL
Affects Versions: 2.1.0, 2.0.0, 1.6.0, 1.5.0, 2.2.0
Reporter: Maciej Szymkiewicz
Current docstring provides incorrect description of {{to_replace}} argument:
{quote}
If the value is a dict, then `value` is ignored and `to_replace` must be a
mapping from column name (string) to replacement value.
{quote}
It looks like it has been copied from `na.fill` docs. In fact {{dict}} should
provide mapping from value to replacement value.
Moreover docs fail to explain some fundamental limitations (like lack of
support for heterogeneous values) and some usage scenarios.
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