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Field writers for numerical arrays (#14900)
Row-based frames, and by extension, MSQ now supports numeric array types. This means that all queries consuming or producing arrays would also work with MSQ. Numeric arrays can also be ingested via MSQ. Post this patch, queries like, SELECT [1, 2] would work with MSQ since they consume a numeric array, instead of failing with an unsupported column type exception.
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62 changes: 62 additions & 0 deletions
62
processing/src/main/java/org/apache/druid/frame/field/DoubleArrayFieldReader.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.druid.frame.field; | ||
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| import org.apache.datasketches.memory.Memory; | ||
| import org.apache.druid.segment.ColumnValueSelector; | ||
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| import javax.annotation.Nullable; | ||
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| /** | ||
| * Reader for fields written by {@link NumericArrayFieldWriter#getDoubleArrayFieldWriter} | ||
| */ | ||
| public class DoubleArrayFieldReader extends NumericArrayFieldReader | ||
| { | ||
| @Override | ||
| public ColumnValueSelector<?> makeColumnValueSelector( | ||
| Memory memory, | ||
| ReadableFieldPointer fieldPointer | ||
| ) | ||
| { | ||
| return new NumericArrayFieldSelector<Double>(memory, fieldPointer) | ||
| { | ||
| final SettableFieldPointer fieldPointer = new SettableFieldPointer(); | ||
| final ColumnValueSelector<?> columnValueSelector = | ||
| DoubleFieldReader.forArray().makeColumnValueSelector(memory, fieldPointer); | ||
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| @Nullable | ||
| @Override | ||
| public Double getIndividualValueAtMemory(long position) | ||
| { | ||
| fieldPointer.setPosition(position); | ||
| if (columnValueSelector.isNull()) { | ||
| return null; | ||
| } | ||
| return columnValueSelector.getDouble(); | ||
| } | ||
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| @Override | ||
| public int getIndividualFieldSize() | ||
| { | ||
| return Byte.BYTES + Double.BYTES; | ||
| } | ||
| }; | ||
| } | ||
| } |
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