Github user gatorsmile commented on the pull request:
https://github.com/apache/spark/pull/11100#issuecomment-183625392
@davies Already deprecated `GROUPING__ID` in the latest commits and also
clean all the test cases.
Also tried to output a better error message when users manually specify
`GROUPING__ID` in the query, but I hit an issue. To compare the column names,
we need to pass `conf` or `resolver` to the function `checkAnalysis`. This will
touch multiple files that call this function. I am not sure if it is worthy for
this purpose. Let me know if you want me to do it. Thanks!
```
def resolver: Resolver = {
if (conf.caseSensitiveAnalysis) {
caseSensitiveResolution
} else {
caseInsensitiveResolution
}
}
```
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