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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