Incorrect group-by columns when joining grouped data frames with overlapping columns #2330
I have a fix and will submit a pull request.
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…2334) * Fix subset_join to update group column names in attribute vars when they are duplicate column names. * Add tests for appropriate group columns after join. * Add test for group indices on expanding join with grouped data frame. * Fix build_index_cpp to report correct missing group column name. Currently when a group column name does not exist in the data frame, it reports a name from the names vector (all columns) instead of the vars vector (group columns). * Add test for error message on non-existent group columns.