| /* |
| * 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.segment; |
| |
| import org.apache.druid.collections.bitmap.BitmapFactory; |
| import org.apache.druid.query.filter.ColumnIndexSelector; |
| import org.apache.druid.segment.column.ColumnCapabilities; |
| import org.apache.druid.segment.column.ColumnHolder; |
| import org.apache.druid.segment.column.ColumnIndexSupplier; |
| import org.apache.druid.segment.column.NumericColumn; |
| |
| import javax.annotation.Nullable; |
| |
| /** |
| * |
| */ |
| public class ColumnSelectorColumnIndexSelector implements ColumnIndexSelector |
| { |
| private final BitmapFactory bitmapFactory; |
| private final VirtualColumns virtualColumns; |
| private final ColumnSelector columnSelector; |
| |
| public ColumnSelectorColumnIndexSelector( |
| final BitmapFactory bitmapFactory, |
| final VirtualColumns virtualColumns, |
| final ColumnSelector index |
| ) |
| { |
| this.bitmapFactory = bitmapFactory; |
| this.virtualColumns = virtualColumns; |
| this.columnSelector = index; |
| } |
| |
| @Override |
| public int getNumRows() |
| { |
| // This closes the __time column, which may initially seem like good behavior, but in reality leads to a |
| // double-close when columnSelector is a ColumnCache (because all columns from a ColumnCache are closed when |
| // the cache itself is closed). We're closing it here anyway, however, for two reasons: |
| // |
| // 1) Sometimes, columnSelector is DeprecatedQueryableIndexColumnSelector, not ColumnCache, and so the close |
| // here is important. |
| // 2) Double-close is OK for the __time column when this method is expected to be used: the __time column is |
| // expected to be a ColumnarLongs, which is safe to double-close. |
| |
| try (final NumericColumn column = (NumericColumn) columnSelector.getColumnHolder(ColumnHolder.TIME_COLUMN_NAME) |
| .getColumn()) { |
| return column.length(); |
| } |
| } |
| |
| @Override |
| public BitmapFactory getBitmapFactory() |
| { |
| return bitmapFactory; |
| } |
| |
| @Override |
| public ColumnIndexSupplier getIndexSupplier(String column) |
| { |
| final ColumnIndexSupplier indexSupplier; |
| if (isVirtualColumn(column)) { |
| indexSupplier = virtualColumns.getIndexSupplier(column, columnSelector); |
| } else { |
| final ColumnHolder columnHolder = columnSelector.getColumnHolder(column); |
| // for missing columns and columns with types that do not support filtering, |
| // treat the column as if it were full of nulls. This allows callers to fabricate an 'all true' or 'all false' |
| // index so that filters which match the values can still use "indexes". |
| if (columnHolder == null || !columnHolder.getCapabilities().isFilterable()) { |
| return null; |
| } |
| indexSupplier = columnHolder.getIndexSupplier(); |
| } |
| return indexSupplier; |
| } |
| |
| private boolean isVirtualColumn(final String columnName) |
| { |
| return virtualColumns.getVirtualColumn(columnName) != null; |
| } |
| |
| @Nullable |
| @Override |
| public ColumnCapabilities getColumnCapabilities(String column) |
| { |
| return virtualColumns.getColumnCapabilities(columnSelector, column); |
| } |
| } |