[I] [JS] Incorrect Table concat after serialize [arrow-js]

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

asfimport opened a new issue, #96:
URL: https://github.com/apache/arrow-js/issues/96

   After reading an arrow table from disk and concatenating another arrow table, this concatenated table loses it's last concatenated chunk after serializing to disk. 
   
    
   
   Steps to reproduce: 
   ```java
   
   // helper that creates a vector to make the below more succinct 
   function createSomeVectors(){ return [ FloatVector.from(Float32Array.from([1]))] } 
   
   // CORRECT
   // Create tables T1 + T2. Each contain 1 vector with 1 value
   const T1 = Table.new(createSomeVectors(), ['value'])    
   const T2 = Table.new(createSomeVectors(), ['value'])
   
   // Combine these tables    
   const combined = T1.concat(T2)
   
   // Serialize and read back this combination (mimic saving and reading from disk)    
   const combinedAfterSerialization = Table.from([combined.serialize()])
   
   // Print the count (works correctly)    
   console.log(T1.count(), T2.count(), combined.count(), combinedAfterSerialization.count()) 
   // Result (as expected)= 2, 2, 2, 2 
   
   
   // INCORRECT        
   // Serialize T1 and read back. (mimic saving and reading from disk)    
   const T1SerializedAndBack = Table.from([T1.serialize()])
   
   // Combine just read T1SerializedAndBack with T2    
   const combined2 = T1SerializedAndBack.concat(T2)
   
   // Serialize and read back this combination (mimic saving and reading from disk)    
   const combinedAfterSerialization2 = Table.from([combined2.serialize()])
   
   // Print the count (works Incorrectly)    
   console.log(T1SerializedAndBack.count(), T2.count(), combined2.count(), combinedAfterSerialization2.count()) 
   // Result (NOT as expected)= 2, 2, 2, 1 <=!! 
   ```
    
   
   **Reporter**: [geert-jan brits](https://issues.apache.org/jira/browse/ARROW-15086)
   
   <sub>**Note**: *This issue was originally created as [ARROW-15086](https://issues.apache.org/jira/browse/ARROW-15086). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*</sub>


-- 
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

To unsubscribe, e-mail: issues-unsubscribe@arrow.apache.org.apache.org

For queries about this service, please contact Infrastructure at:
users@infra.apache.org