Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/14994
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GitHub user cloud-fan opened a pull request:
https://github.com/apache/spark/pull/14994
[SPARK-17432][SQL] PreprocessDDL should respect case sensitivity when
checking duplicated columns
## What changes were proposed in this pull request?
In `PreprocessDDL` we will check if
