[jira] [Created] (ARROW-15086) [JS] Incorrect Table concat after serialize

["geert-jan brits (Jira)" <ji...@apache.org>]

geert-jan brits created ARROW-15086:
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             Summary: [JS] Incorrect Table concat after serialize
                 Key: ARROW-15086
                 URL: https://issues.apache.org/jira/browse/ARROW-15086
             Project: Apache Arrow
          Issue Type: Bug
          Components: JavaScript
    Affects Versions: 6.0.1
            Reporter: geert-jan brits


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 below: 
{code:java}
/////////////////    // CORRECT
    // Create tables T1 + T2. Each contain 1 vector with 1 value    const T1 = Table.new(createSomeVectors(), ['number'])    const T2 = Table.new(createSomeVectors(), ['number'])
    // Combine these tables    const combined = T1.concat(T2)
    // Serialize and read back this combination (mimic 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 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 reading from disk)    const combinedAfterSerialization2 = Table.from([combined2.serialize()])
    // Print the count (works correctly)    console.log(T1SerializedAndBack.count(), T2.count(), combined2.count(), combinedAfterSerialization2.count()) // Result (NOT as expected)= 2, 2, 2, 1 <=!! {code}
 



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