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9ce61dc677
Closes #9003. This PR changes `group-by` so that its optional argument is interpreted as a cell path. In turn, this lets users use `?` to ignore rows that are missing the column they wish to group on. For example: ``` > [{foo: 123}, {foo: 234}, {bar: 345}] | group-by foo Error: nu:🐚:column_not_found × Cannot find column ╭─[entry #3:1:1] 1 │ [{foo: 123}, {foo: 234}, {bar: 345}] | group-by foo · ─────┬──── ─┬─ · │ ╰── cannot find column 'foo' · ╰── value originates here ╰──── > [{foo: 123}, {foo: 234}, {bar: 345}] | group-by foo? ╭─────┬───────────────╮ │ 123 │ [table 1 row] │ │ 234 │ [table 1 row] │ ╰─────┴───────────────╯ ``` ~~This removes the ability to pass `group-by` a closure or block (I wasn't able to figure out how to make the 2 features coexist), and so it is a breaking change. I think this is OK; I didn't even know `group-by` could accept a closure or block because there was no example for that functionality.~~ |
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