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74 changes: 74 additions & 0 deletions
74
pinot-core/src/main/java/org/apache/pinot/core/map/MapUtils.java
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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. | ||
| */ | ||
|
|
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| package org.apache.pinot.core.map; | ||
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| import java.util.Map; | ||
| import org.apache.pinot.common.request.context.ExpressionContext; | ||
| import org.apache.pinot.segment.local.segment.index.map.MapDataSource; | ||
| import org.apache.pinot.segment.spi.IndexSegment; | ||
| import org.apache.pinot.segment.spi.datasource.DataSource; | ||
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| public class MapUtils { | ||
| private MapUtils() { | ||
| } | ||
|
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| /** | ||
| * In the current model of integration between Map columns and the Pinot query engine, when an Item operation is | ||
| * applied to a map column (e.g., `myMap['foo']`) we create a new DataSource that treats that expression as if it | ||
| * were a column. In other words, the Query Engine treats a Key within a Map column just as it would a user | ||
| * defined Column. In order for this to work, we must map Item operations to unique column names and then map | ||
| * those unique column names to a Data Source. This function handles traversing a query expression, finding any | ||
| * Map Item operations, constructing the unique internal column and mapping it to the appropriate Key Data Source. | ||
| * | ||
| * @param indexSegment | ||
| * @param dataSourceMap - the Caller's mapping from column names to Data Source for that column. This function will | ||
| * add Key's to this mapping. | ||
| * @param expression - The expression to analyze for Map Item operations. | ||
| */ | ||
| public static void addMapItemOperationsToDataSourceMap(IndexSegment indexSegment, | ||
| Map<String, DataSource> dataSourceMap, ExpressionContext expression) { | ||
| if (expression.getType() == ExpressionContext.Type.FUNCTION) { | ||
| if (expression.getFunction().getFunctionName().equals("item")) { | ||
| String columnOp = expression.getFunction().getArguments().get(0).toString(); | ||
| String key = expression.getFunction().getArguments().get(1).getLiteral().getStringValue(); | ||
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| dataSourceMap.put(constructKeyDataSourceIdentifier(columnOp, key), | ||
| ((MapDataSource) indexSegment.getDataSource(columnOp)).getKeyDataSource(key)); | ||
| } else { | ||
| // Iterate over the operands and check if any of them are Map Item operations | ||
| expression.getFunction().getArguments().forEach( | ||
| arg -> addMapItemOperationsToDataSourceMap(indexSegment, dataSourceMap, arg)); | ||
| } | ||
| } | ||
| } | ||
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| /** | ||
| * Constructs the internal identifier for DataSources that represent the values of a specific key within a Map | ||
| * column. | ||
| * | ||
| * @param column | ||
| * @param key | ||
| * @return | ||
| */ | ||
| public static String constructKeyDataSourceIdentifier(String column, String key) { | ||
| return String.format("map_col__%s.%s", column, key); | ||
| } | ||
| } |
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139 changes: 139 additions & 0 deletions
139
...main/java/org/apache/pinot/core/operator/transform/function/MapItemTransformFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| /** | ||
| * 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.pinot.core.operator.transform.function; | ||
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| import com.google.common.base.Preconditions; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import org.apache.pinot.core.map.MapUtils; | ||
| import org.apache.pinot.core.operator.ColumnContext; | ||
| import org.apache.pinot.core.operator.blocks.ValueBlock; | ||
| import org.apache.pinot.core.operator.transform.TransformResultMetadata; | ||
| import org.apache.pinot.segment.local.segment.index.map.MapDataSource; | ||
| import org.apache.pinot.segment.spi.datasource.DataSource; | ||
| import org.apache.pinot.segment.spi.index.reader.Dictionary; | ||
| import org.apache.pinot.spi.data.FieldSpec; | ||
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| /** | ||
| * Evaluates myMap['foo'] | ||
| */ | ||
| public class MapItemTransformFunction { | ||
| public static class MapItemFunction extends BaseTransformFunction { | ||
| public static final String FUNCTION_NAME = "map_item"; | ||
| String _column; | ||
| String _key; | ||
| String _keyDataSourceId; | ||
| TransformFunction _mapValue; | ||
| TransformFunction _keyValue; | ||
| Dictionary _keyDictionary; | ||
| private TransformResultMetadata _resultMetadata; | ||
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| public MapItemFunction() { | ||
| _column = null; | ||
| _key = null; | ||
| _keyDataSourceId = null; | ||
| } | ||
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| @Override | ||
| public void init(List<TransformFunction> arguments, Map<String, ColumnContext> columnContextMap) { | ||
| super.init(arguments, columnContextMap); | ||
| // Should be exactly 2 arguments (map value expression and key expression | ||
| if (arguments.size() != 2) { | ||
| throw new IllegalArgumentException("Exactly 1 argument is required for Vector transform function"); | ||
| } | ||
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| // Check if the second operand (the key) is a string literal, if it is then we can directly construct the | ||
| // MapDataSource which will pre-compute the Key ID. | ||
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| _mapValue = arguments.get(0); | ||
| Preconditions.checkArgument(_mapValue instanceof IdentifierTransformFunction, "Map Item: Left operand" | ||
| + "must be an identifier"); | ||
| _column = ((IdentifierTransformFunction) _mapValue).getColumnName(); | ||
| if (_column == null) { | ||
| throw new IllegalArgumentException("Map Item: left operand resolved to a null column name"); | ||
| } | ||
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| _keyValue = arguments.get(1); | ||
| Preconditions.checkArgument(_keyValue instanceof LiteralTransformFunction, "Map Item: Right operand" | ||
| + "must be a literal"); | ||
| _key = ((LiteralTransformFunction) arguments.get(1)).getStringLiteral(); | ||
| Preconditions.checkArgument(_key != null, "Map Item: Right operand" | ||
| + "must be a string literal"); | ||
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| _keyDataSourceId = MapUtils.constructKeyDataSourceIdentifier(_column, _key); | ||
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| // The metadata about the values that this operation will resolve to is determined by the type of teh data | ||
| // under they key, not by the Map column. So we need to look up the Key's Metadata. | ||
| MapDataSource mapDS = (MapDataSource) columnContextMap.get(_column).getDataSource(); | ||
| if (mapDS == null) { | ||
| // This should _always_ be a Map Data Source. | ||
| throw new RuntimeException("The left operand for a MAP ITEM operation must resolve to a Map Data Source"); | ||
| } | ||
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| DataSource keyDS = mapDS.getKeyDataSource(_key); | ||
| FieldSpec.DataType keyType = keyDS.getDataSourceMetadata().getDataType().getStoredType(); | ||
| _keyDictionary = keyDS.getDictionary(); | ||
| _resultMetadata = | ||
| new TransformResultMetadata(keyType, keyDS.getDataSourceMetadata().isSingleValue(), | ||
| _keyDictionary != null); | ||
| } | ||
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| @Override | ||
| public String getName() { | ||
| return FUNCTION_NAME; | ||
| } | ||
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| @Override | ||
| public TransformResultMetadata getResultMetadata() { | ||
| return new TransformResultMetadata(_resultMetadata.getDataType().getStoredType(), true, | ||
| _resultMetadata.hasDictionary()); | ||
| } | ||
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| @Override | ||
| public Dictionary getDictionary() { | ||
| return _keyDictionary; | ||
| } | ||
|
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| @Override | ||
| public int[] transformToDictIdsSV(ValueBlock valueBlock) { | ||
| return transformToIntValuesSV(valueBlock); | ||
| } | ||
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| @Override | ||
| public int[] transformToIntValuesSV(ValueBlock valueBlock) { | ||
| return valueBlock.getBlockValueSet(_keyDataSourceId).getIntValuesSV(); | ||
| } | ||
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| @Override | ||
| public long[] transformToLongValuesSV(ValueBlock valueBlock) { | ||
| return valueBlock.getBlockValueSet(_keyDataSourceId).getLongValuesSV(); | ||
| } | ||
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| @Override | ||
| public double[] transformToDoubleValuesSV(ValueBlock valueBlock) { | ||
| return valueBlock.getBlockValueSet(_keyDataSourceId).getDoubleValuesSV(); | ||
| } | ||
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| @Override | ||
| public String[] transformToStringValuesSV(ValueBlock valueBlock) { | ||
| return valueBlock.getBlockValueSet(_keyDataSourceId).getStringValuesSV(); | ||
| } | ||
| } | ||
| } |
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