| /* |
| * 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.virtual; |
| |
| import com.google.common.base.Predicate; |
| import org.apache.druid.common.config.NullHandling; |
| import org.apache.druid.math.expr.ExprEval; |
| import org.apache.druid.query.extraction.ExtractionFn; |
| import org.apache.druid.query.filter.ValueMatcher; |
| import org.apache.druid.query.monomorphicprocessing.RuntimeShapeInspector; |
| import org.apache.druid.segment.ColumnValueSelector; |
| import org.apache.druid.segment.DimensionSelector; |
| import org.apache.druid.segment.IdLookup; |
| import org.apache.druid.segment.data.IndexedInts; |
| import org.apache.druid.segment.data.RangeIndexedInts; |
| import org.apache.druid.segment.data.ZeroIndexedInts; |
| |
| import javax.annotation.Nullable; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Objects; |
| import java.util.stream.Collectors; |
| |
| /** |
| * Basic multi-value dimension selector for an {@link org.apache.druid.math.expr.Expr} evaluating |
| * {@link ColumnValueSelector}. |
| */ |
| public class ExpressionMultiValueDimensionSelector implements DimensionSelector |
| { |
| public static ExpressionMultiValueDimensionSelector fromValueSelector( |
| ColumnValueSelector<ExprEval> baseSelector, |
| @Nullable ExtractionFn extractionFn |
| ) |
| { |
| if (extractionFn != null) { |
| return new ExtractionMultiValueDimensionSelector(baseSelector, extractionFn); |
| } |
| return new ExpressionMultiValueDimensionSelector(baseSelector); |
| } |
| |
| protected final ColumnValueSelector<ExprEval> baseSelector; |
| |
| public ExpressionMultiValueDimensionSelector(ColumnValueSelector<ExprEval> baseSelector) |
| { |
| this.baseSelector = baseSelector; |
| } |
| |
| ExprEval getEvaluated() |
| { |
| return baseSelector.getObject(); |
| } |
| |
| @Nullable |
| String getValue(ExprEval evaluated) |
| { |
| assert !evaluated.isArray(); |
| return NullHandling.emptyToNullIfNeeded(evaluated.asString()); |
| } |
| |
| List<String> getArray(ExprEval evaluated) |
| { |
| assert evaluated.isArray(); |
| //noinspection ConstantConditions |
| return Arrays.stream(evaluated.asStringArray()) |
| .map(NullHandling::emptyToNullIfNeeded) |
| .collect(Collectors.toList()); |
| } |
| |
| @Nullable |
| String getArrayValue(ExprEval evaluated, int i) |
| { |
| assert evaluated.isArray(); |
| String[] stringArray = evaluated.asStringArray(); |
| //noinspection ConstantConditions because of assert statement above |
| assert i < stringArray.length; |
| return NullHandling.emptyToNullIfNeeded(stringArray[i]); |
| } |
| |
| @Override |
| public IndexedInts getRow() |
| { |
| ExprEval evaluated = getEvaluated(); |
| if (evaluated.isArray()) { |
| RangeIndexedInts ints = new RangeIndexedInts(); |
| Object[] evaluatedArray = evaluated.asArray(); |
| ints.setSize(evaluatedArray != null ? evaluatedArray.length : 0); |
| return ints; |
| } |
| return ZeroIndexedInts.instance(); |
| } |
| |
| @Override |
| public int getValueCardinality() |
| { |
| return CARDINALITY_UNKNOWN; |
| } |
| |
| @Nullable |
| @Override |
| public String lookupName(int id) |
| { |
| ExprEval evaluated = getEvaluated(); |
| if (evaluated.isArray()) { |
| return getArrayValue(evaluated, id); |
| } |
| assert id == 0; |
| return NullHandling.emptyToNullIfNeeded(evaluated.asString()); |
| } |
| |
| @Override |
| public ValueMatcher makeValueMatcher(@Nullable String value) |
| { |
| return new ValueMatcher() |
| { |
| @Override |
| public boolean matches() |
| { |
| ExprEval evaluated = getEvaluated(); |
| if (evaluated.isArray()) { |
| List<String> array = getArray(evaluated); |
| return array.stream().anyMatch(x -> Objects.equals(x, value)); |
| } |
| return Objects.equals(getValue(evaluated), value); |
| } |
| |
| @Override |
| public void inspectRuntimeShape(RuntimeShapeInspector inspector) |
| { |
| inspector.visit("selector", baseSelector); |
| } |
| }; |
| } |
| |
| @Override |
| public ValueMatcher makeValueMatcher(Predicate<String> predicate) |
| { |
| return new ValueMatcher() |
| { |
| @Override |
| public boolean matches() |
| { |
| ExprEval evaluated = getEvaluated(); |
| if (evaluated.isArray()) { |
| List<String> array = getArray(evaluated); |
| return array.stream().anyMatch(x -> predicate.apply(x)); |
| } |
| return predicate.apply(getValue(evaluated)); |
| } |
| |
| @Override |
| public void inspectRuntimeShape(RuntimeShapeInspector inspector) |
| { |
| inspector.visit("selector", baseSelector); |
| inspector.visit("predicate", predicate); |
| } |
| }; |
| } |
| |
| @Override |
| public void inspectRuntimeShape(RuntimeShapeInspector inspector) |
| { |
| inspector.visit("baseSelector", baseSelector); |
| } |
| |
| @Override |
| public boolean nameLookupPossibleInAdvance() |
| { |
| return false; |
| } |
| |
| @Nullable |
| @Override |
| public IdLookup idLookup() |
| { |
| return null; |
| } |
| |
| @Nullable |
| @Override |
| public Object getObject() |
| { |
| ExprEval evaluated = getEvaluated(); |
| if (evaluated.isArray()) { |
| return getArray(evaluated); |
| } |
| return getValue(evaluated); |
| } |
| |
| @Override |
| public Class<?> classOfObject() |
| { |
| return Object.class; |
| } |
| |
| /** |
| * expressions + extractions |
| */ |
| static class ExtractionMultiValueDimensionSelector extends ExpressionMultiValueDimensionSelector |
| { |
| private final ExtractionFn extractionFn; |
| |
| private ExtractionMultiValueDimensionSelector(ColumnValueSelector<ExprEval> baseSelector, ExtractionFn extractionFn) |
| { |
| super(baseSelector); |
| this.extractionFn = extractionFn; |
| } |
| |
| @Override |
| String getValue(ExprEval evaluated) |
| { |
| assert !evaluated.isArray(); |
| return extractionFn.apply(NullHandling.emptyToNullIfNeeded(evaluated.asString())); |
| } |
| |
| @Override |
| List<String> getArray(ExprEval evaluated) |
| { |
| assert evaluated.isArray(); |
| return Arrays.stream(evaluated.asStringArray()) |
| .map(x -> extractionFn.apply(NullHandling.emptyToNullIfNeeded(x))) |
| .collect(Collectors.toList()); |
| } |
| |
| @Override |
| String getArrayValue(ExprEval evaluated, int i) |
| { |
| assert evaluated.isArray(); |
| String[] stringArray = evaluated.asStringArray(); |
| assert i < stringArray.length; |
| return extractionFn.apply(NullHandling.emptyToNullIfNeeded(stringArray[i])); |
| } |
| |
| @Override |
| public void inspectRuntimeShape(RuntimeShapeInspector inspector) |
| { |
| inspector.visit("baseSelector", baseSelector); |
| inspector.visit("extractionFn", extractionFn); |
| } |
| } |
| } |