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  1. Apache Arrow
  2. ARROW-13737

[C++] Support scalar columns in hash aggregations (was: hash_sum on scalar column segfaults)

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      Reproducer in R. Works fine without grouping, but segfaults if you group:

      tab <- Table$create(a=1:4, b=6:9)
      
      tab %>% 
        mutate(counter = 1) %>% 
        summarize(count = sum(counter))
      
      Table
      1 rows x 1 columns
      $count <double>
      
      tab %>% 
        mutate(counter = 1) %>% 
        group_by(a) %>% 
        summarize(count = sum(counter))
      
       *** caught segfault ***
      address 0x0, cause 'invalid permissions'
      
      Traceback:
       1: .Call(`_arrow_ExecPlan_run`, plan, final_node)
       2: ExecPlan_run(self, node)
       3: plan$Run(final_node)
       4: do_exec_plan(.data, group_vars = dplyr::group_vars(.data))
       5: do_arrow_summarize(.data, ...)
      ...
      

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              lidavidm David Li
              npr Neal Richardson
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