Kapil Singh created SPARK-16889:
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Summary: Add formatMessage Column expression for formatting
strings in java.text.MessageFormat style in Scala API
Key: SPARK-16889
URL: https://issues.apache.org/jira/browse/SPARK-16889
Project: Spark
Issue Type: New Feature
Components: SQL
Reporter: Kapil Singh
format_string formats the arguments in printf-style and has following major
cons compared to proposed function for formatting java.text.MessageFormat:
1. MessageFormat syntax is more readable since it is more explicit
java.util.Formatter syntax: "Argument '%s' shall not be negative. The given
value was %f."
java.text.MessageFormat syntax: "Argument '{0}' shall not be negative. The
given value was {1}."
2. Formatter forces user to declare the argument type (e.g. "%s" or "%f"),
while MessageFormat infers it from the object type. For example if the argument
could be a string or a number, then Formatter forces us to use the "%s" type
(passing a string to "%f" causes an exception). However a number formatted with
"%s" is formatted using Number.toString(), which produce an unlocalized value.
By contrast, MessageFormat produces localized values dynamically for all
recognized types.
To address these drawbacks, a MessageFormat function should be added.
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