SML0127 commented on issue #11081:
URL: https://github.com/apache/iceberg/issues/11081#issuecomment-2330951529
@pvary
Thk for answer pvary.
Now I'm checking some code in ColumnarBatchReader, whether it works as
follow:
1. apply eq delete files first, from oldest snapshot
2. then apply data file and pos delete files
3. reapply from step 1 for the next snapshot.
I'm still looking into it so it could be wrong.
```java
ColumnarBatch loadDataToColumnBatch() {
int numRowsUndeleted = initRowIdMapping();
ColumnVector[] arrowColumnVectors = readDataToColumnVectors();
ColumnarBatch newColumnarBatch = new ColumnarBatch(arrowColumnVectors);
newColumnarBatch.setNumRows(numRowsUndeleted);
if (hasEqDeletes()) { // eq 있는지 한번더 확인?
applyEqDelete(newColumnarBatch);
}
if (hasIsDeletedColumn && rowIdMapping != null) {
// reset the row id mapping array, so that it doesn't filter out the
deleted rows
for (int i = 0; i < numRowsToRead; i++) {
rowIdMapping[i] = i;
}
newColumnarBatch.setNumRows(numRowsToRead);
}
return newColumnarBatch;
}
```
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