[jira] [Created] (ARROW-18161) Reading error table causes mutations

["Noah Horton (Jira)" <ji...@apache.org>]

Noah Horton created ARROW-18161:
-----------------------------------

             Summary: Reading error table causes mutations
                 Key: ARROW-18161
                 URL: https://issues.apache.org/jira/browse/ARROW-18161
             Project: Apache Arrow
          Issue Type: Bug
          Components: Ruby
    Affects Versions: 9.0.0
         Environment: Ruby 3.1.2
            Reporter: Noah Horton


ven an Arrow::Table with several columns "X"

 
{code:ruby}
# Rails console outputs
3.1.2 :107 > x.schema
 => 
#<Arrow::Schema:0x7ff2fbc426d8 ptr=0x55851587bc20 actual_values: int64
dates: date32[day]                             
expected_values: double>                       
3.1.2 :108 > x.schema
 => 
#<Arrow::Schema:0x7ff2fbbcda68 ptr=0x55851a541020 actual_values: int64
dates: date32[day]                             
expected_values: double>                       
3.1.2 :109 >  {code}
Note that the object and pointer have both changed values.

But the far bigger issue is that repeated reads from it will cause different results:
{code:ruby}
3.1.2 :097 > x[1][0]
 => Sun, 22 Aug 2021 
3.1.2 :098 > x[1][1]
 => nil 
3.1.2 :099 > x[1][0]
 => nil {code}
I have a lot of things hitting like this - when I have done those accesses, I get the originally table with the columns all shuffled around. 

I do ingest the data slightly oddly in the first place as it comes in over GRPC and I am using Arrow::Buffer to read it from the GRPC and then passing that into Arrow::Table.load. But I would not expect that once it was in Arrow::Table that I could do anything to permute it unintentionally.

 

 



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