org.apache.druid.query.rowsandcols.semantic.DefaultSortedMatrixMaker Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.druid.query.rowsandcols.semantic;
import org.apache.druid.java.util.common.RE;
import org.apache.druid.query.rowsandcols.RowsAndColumns;
import org.apache.druid.query.rowsandcols.column.BinarySearchableAccessor;
import org.apache.druid.query.rowsandcols.column.Column;
import org.apache.druid.query.rowsandcols.util.FindResult;
import java.util.ArrayList;
import java.util.List;
/**
* The DefaultSortedMatrixMaker is a SortedMatrixMaker that works on the generic RowsAndColumns interface.
*
* It does not validate that things are sorted, it just assumes that they must be. As such, behavior are undefined
* when running on top of a RowsAndColumns that is not actually sorted by the columns passed into {@link #make}
*/
public class DefaultSortedMatrixMaker implements SortedMatrixMaker
{
private final RowsAndColumns rac;
public DefaultSortedMatrixMaker(
RowsAndColumns rac
)
{
this.rac = rac;
}
@Override
public SortedMatrix make(List columns)
{
ArrayList soughtColumns = new ArrayList<>(columns.size());
for (String column : columns) {
// Note, this can add `null` to the list. That's intentional, iterations over this list must deal
// with null entries meaning that the column doesn't exist
final Column racColumn = rac.findColumn(column);
if (racColumn == null) {
soughtColumns.add(null);
} else {
soughtColumns.add(BinarySearchableAccessor.fromColumn(racColumn));
}
}
return new SortedMatrix()
{
@Override
public int numRows()
{
return rac.numRows();
}
@Override
public MatrixRow getRow(int rowId)
{
return new MatrixRow()
{
@Override
public int length()
{
return soughtColumns.size();
}
@Override
public boolean isNull(int columnId)
{
final BinarySearchableAccessor column = soughtColumns.get(columnId);
if (column == null) {
return true;
} else {
return column.isNull(rowId);
}
}
@Override
public Object getObject(int columnId)
{
final BinarySearchableAccessor column = soughtColumns.get(columnId);
if (column == null) {
return null;
} else {
return column.getObject(rowId);
}
}
@Override
public double getDouble(int columnId)
{
final BinarySearchableAccessor column = soughtColumns.get(columnId);
if (column == null) {
return 0;
} else {
return column.getDouble(rowId);
}
}
@Override
public float getFloat(int columnId)
{
final BinarySearchableAccessor column = soughtColumns.get(columnId);
if (column == null) {
return 0;
} else {
return column.getFloat(rowId);
}
}
@Override
public long getLong(int columnId)
{
final BinarySearchableAccessor column = soughtColumns.get(columnId);
if (column == null) {
return 0;
} else {
return column.getLong(rowId);
}
}
};
}
@Override
public FindResult findRow(
int startRowIndex,
MatrixRow row
)
{
int start = startRowIndex;
int end = numRows();
for (int i = 0; i < row.length(); ++i) {
final BinarySearchableAccessor searcher = soughtColumns.get(i);
if (searcher == null) {
if (row.isNull(i)) {
continue;
} else {
// We don't have the column at all, that means that we can only match `null`. Given that the data
// is sorted, the next possible value is the next value of the previous column, so return that as our
// end.
return FindResult.notFound(end);
}
}
final FindResult result;
if (row.isNull(i)) {
result = searcher.findNull(start, end);
} else {
switch (searcher.getType().getType()) {
case STRING:
result = searcher.findString(start, end, (String) row.getObject(i));
break;
case LONG:
if (row.isNull(i)) {
result = searcher.findNull(start, end);
} else {
result = searcher.findLong(start, end, row.getLong(i));
}
break;
case DOUBLE:
result = searcher.findDouble(start, end, row.getDouble(i));
break;
case FLOAT:
result = searcher.findFloat(start, end, row.getFloat(i));
break;
case ARRAY:
case COMPLEX:
result = searcher.findComplex(start, end, row.getObject(i));
break;
default:
throw new RE("Unknown type[%s]", searcher.getType());
}
}
if (result.wasFound()) {
start = result.getStartRow();
end = result.getEndRow();
} else {
return FindResult.notFound(result.getNext());
}
}
return FindResult.found(start, end);
}
};
}
}