Github user liancheng commented on the pull request:
https://github.com/apache/spark/pull/3470#issuecomment-65182946
Actually I'm not sure whether making option names case insensitive a good
idea. Semantically, these options are very similar to Hive table properties,
which are case sensitive. This makes me think these options should be case
sensitive at the very beginning. For simple options that look like keywords,
case insensitive might make sense. But we probably want to add dotted option
names like `partition.defaultName` in the future. Another reason is that, case
insensitivity is always a source of bugs...
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