// Called between every row.
public void reset() {
this.index = 0;
this.column = this.columns[this.index];
for (ColumnCount col : this.columns) {
col.setCount(0);
}
resetTS();
}
/** {@inheritDoc} */
@Override
public ScanQueryMatcher.MatchCode checkColumn(Cell cell, byte type) {
// delete markers should never be passed to an
// *Explicit*ColumnTracker
assert !CellUtil.isDelete(type);
do {
// No more columns left, we are done with this query
if (done()) {
return ScanQueryMatcher.MatchCode.SEEK_NEXT_ROW; // done_row
}
// No more columns to match against, done with storefile
if (this.column == null) {
return ScanQueryMatcher.MatchCode.SEEK_NEXT_ROW; // done_row
}
// Compare specific column to current column
int ret =
CellComparator.compareQualifiers(
cell, column.getBuffer(), column.getOffset(), column.getLength());
// Column Matches. Return include code. The caller would call checkVersions
// to limit the number of versions.
if (ret == 0) {
return ScanQueryMatcher.MatchCode.INCLUDE;
}
resetTS();
if (ret < 0) {
// The current KV is smaller than the column the ExplicitColumnTracker
// is interested in, so seek to that column of interest.
return ScanQueryMatcher.MatchCode.SEEK_NEXT_COL;
}
// The current KV is bigger than the column the ExplicitColumnTracker
// is interested in. That means there is no more data for the column
// of interest. Advance the ExplicitColumnTracker state to next
// column of interest, and check again.
if (ret > 0) {
++this.index;
if (done()) {
// No more to match, do not include, done with this row.
return ScanQueryMatcher.MatchCode.SEEK_NEXT_ROW; // done_row
}
// This is the recursive case.
this.column = this.columns[this.index];
}
} while (true);
}
/**
* This method is used to inform the column tracker that we are done with this column. We may get
* this information from external filters or timestamp range and we then need to indicate this
* information to tracker. It is required only in case of ExplicitColumnTracker.
*
* @param cell
*/
public void doneWithColumn(Cell cell) {
while (this.column != null) {
int compare =
CellComparator.compareQualifiers(
cell, column.getBuffer(), column.getOffset(), column.getLength());
resetTS();
if (compare >= 0) {
++this.index;
if (done()) {
// Will not hit any more columns in this storefile
this.column = null;
} else {
this.column = this.columns[this.index];
}
if (compare > 0) {
continue;
}
}
return;
}
}
