[jira] [Created] (ARROW-8909) Out of order writes using setSafe

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

Saurabh created ARROW-8909:
------------------------------

             Summary: Out of order writes using setSafe
                 Key: ARROW-8909
                 URL: https://issues.apache.org/jira/browse/ARROW-8909
             Project: Apache Arrow
          Issue Type: Bug
          Components: Java
            Reporter: Saurabh


I noticed that calling setSafe on a VarCharVector with indices not in increasing order causes the lastIndex to be set to the index in the last call to setSafe.

Is this a documented and expected behavior ?

Sample code:
{code:java}
import java.util.Collections;
import lombok.extern.slf4j.Slf4j;
import org.apache.arrow.memory.RootAllocator;
import org.apache.arrow.vector.VarCharVector;
import org.apache.arrow.vector.VectorSchemaRoot;
import org.apache.arrow.vector.types.pojo.ArrowType;
import org.apache.arrow.vector.types.pojo.Field;
import org.apache.arrow.vector.types.pojo.Schema;
import org.apache.arrow.vector.util.Text;

@Slf4j
public class ATest {

  public static void main() {
    Schema schema = new Schema(Collections.singletonList(Field.nullable("Data", new ArrowType.Utf8())));
    try (VectorSchemaRoot vroot = VectorSchemaRoot.create(schema, new RootAllocator())) {
      VarCharVector vec = (VarCharVector) vroot.getVector("Data");

      for (int i = 0; i < 10; i++) {
        vec.setSafe(i, new Text(Integer.toString(i) + "_mtest"));
      }
      // vec.setSafe(0, new Text(Integer.toString(0) + "_new"));
      vec.setSafe(7, new Text(Integer.toString(7) + "_new"));

      vroot.setRowCount(10);
      log.info(vroot.contentToTSVString());
    }
  }
}
{code}
 

If I don't set the 0 or 7 after the loop, I get all the 0_mtest, 1_mtest, ..., 9_mtest entries.

If I set index 0 after the loop, I only see 0_new entry; other entries are ""

If I set index 7 after the loop, I see 0_mtest, ..., 5_mtest, 7_new; other entries are ""

 



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