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fix:
GROUP_CONCAT
handling of empty separator (issue) (#2474)
`GROUP_CONCAT` was handling an empty separator (i.e. `""`) incorrectly, it would handle it as if the separator were not set, so essentially it was treated as a single space (i.e. `" "`). This change fixes it so that an empty separator with `GROUP_CONCAT` results in a value with nothing between concatenated values. Fixes <#2473> --------- Co-authored-by: WhiteGobo <richardfechner@posteo.net>
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