private void initEntry(int logicalColumnIndex, int projectionColumnNum, TypeInfo typeInfo) {
    projectionColumnNums[logicalColumnIndex] = projectionColumnNum;
    typeInfos[logicalColumnIndex] = typeInfo;
    objectInspectors[logicalColumnIndex] = TypeInfoUtils.getStandardJavaObjectInspectorFromTypeInfo(typeInfo);
  }
This class extracts specified VectorizedRowBatch row columns into writables.

The caller provides the data types and projection column numbers of a subset of the columns
to extract.
ql/src/java/org/apache/hadoop/hive/ql/exec/vector/VectorExtractRow.java