@Override
  protected void buildSelectClauseForInsert(StringBuilder query) {
    query.append("`operation`, `originalTransaction`, `bucket`, `rowId`, `currentTransaction`, `row`");
  }
Builds query strings that help with query-based MINOR compaction of CRUD.
ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/CompactionQueryBuilderForMinor.java