[GitHub] [arrow] heronshoes opened a new issue, #34953: [Ruby] `Table.slice` uses `:emit_null` not `:drop` for `FilterOptions`

["heronshoes (via GitHub)" <gi...@apache.org>]

heronshoes opened a new issue, #34953:
URL: https://github.com/apache/arrow/issues/34953

   ### Describe the bug, including details regarding any error messages, version, and platform.
   
   `Table.slice` behaves as `FilterOptions.null_selection_behavior = :emit_null` for backward compatibility.
   
   This is a differnt behavior from `Table#filter` and `Slicer::ColumnCondition#select` 
   which use default option `:drop`.
   
   Is it better to align with default option `:drop` for `Table.slice` ?
   
   Example:
   ```ruby
   table = Arrow::Table.new(index: [*1..3], string: ["A", "B", nil])
   =>
   #<Arrow::Table:0x7fc7c71b61b0 ptr=0x5612150e1b40>
   	index	string
   0	    1	A     
   1	    2	B     
   2	    3	(null)
   ```
   
   This case:
   ```ruby
   table.slice { |slicer| slicer.string == "A" }
   =>
   #<Arrow::Table:0x7fc7cf2bee10 ptr=0x5612165c5220>
   	 index	string
   0	     1	A     
   1	(null)	(null)
   ```
   
   Reference 1:
   ```ruby
   table.filter([true, nil, false])
   =>
   #<Arrow::Table:0x7fc7cf366a48 ptr=0x561216608250>
   	index	string
   0	    1	A     
   ```
   
   Reference 2:
   ```ruby
   table.slice { |slicer| slicer.string.select { |value| value == "A" } }
   =>
   #<Arrow::Table:0x7fc7c6f7f2e8 ptr=0x5612166326e0>
   	index	string
   0	    1	A    
   ```
   
   ### Component(s)
   
   Ruby


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[GitHub] [arrow] kou closed issue #34953: [Ruby] `Table.slice` uses `:emit_null` not `:drop` for `FilterOptions`

["kou (via GitHub)" <gi...@apache.org>]

kou closed issue #34953: [Ruby] `Table.slice` uses `:emit_null` not `:drop` for `FilterOptions`
URL: https://github.com/apache/arrow/issues/34953


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[GitHub] [arrow] heronshoes commented on issue #34953: [Ruby] `Table.slice` uses `:emit_null` not `:drop` for `FilterOptions`

["heronshoes (via GitHub)" <gi...@apache.org>]

heronshoes commented on issue #34953:
URL: https://github.com/apache/arrow/issues/34953#issuecomment-1501293527

   Thhanks!


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