pradeepgv42 commented on a change in pull request #6120: URL: https://github.com/apache/incubator-pinot/pull/6120#discussion_r524473335
########## File path: pinot-core/src/main/java/org/apache/pinot/core/segment/index/loader/invertedindex/LuceneFSTIndexHandler.java ########## @@ -0,0 +1,131 @@ +/** + * 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.segment.index.loader.invertedindex; + +import org.apache.pinot.core.indexsegment.generator.SegmentVersion; +import org.apache.pinot.core.segment.creator.impl.inv.text.LuceneFSTIndexCreator; +import org.apache.pinot.core.segment.index.metadata.ColumnMetadata; +import org.apache.pinot.core.segment.index.metadata.SegmentMetadataImpl; +import org.apache.pinot.core.segment.index.readers.BaseImmutableDictionary; +import org.apache.pinot.core.segment.index.readers.StringDictionary; +import org.apache.pinot.core.segment.memory.PinotDataBuffer; +import org.apache.pinot.core.segment.store.ColumnIndexType; +import org.apache.pinot.core.segment.store.SegmentDirectory; +import org.apache.pinot.core.segment.store.SegmentDirectoryPaths; +import org.apache.pinot.spi.data.FieldSpec; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.File; +import java.io.IOException; +import java.util.HashSet; +import java.util.Set; + +public class LuceneFSTIndexHandler { + private static final Logger LOGGER = + LoggerFactory.getLogger(LuceneFSTIndexHandler.class); + + private final File _indexDir; + private final SegmentDirectory.Writer _segmentWriter; + private final String _segmentName; + private final SegmentVersion _segmentVersion; + private final Set<ColumnMetadata> _fstIndexColumns = new HashSet<>(); + + + public LuceneFSTIndexHandler( + File indexDir, SegmentMetadataImpl segmentMetadata, Set<String> fstIndexColumns, + SegmentDirectory.Writer segmentWriter) { + _indexDir = indexDir; + _segmentWriter = segmentWriter; + _segmentName = segmentMetadata.getName(); + _segmentVersion = SegmentVersion.valueOf(segmentMetadata.getVersion()); + + for (String column : fstIndexColumns) { + ColumnMetadata columnMetadata = segmentMetadata.getColumnMetadataFor(column); + if (columnMetadata != null) { + _fstIndexColumns.add(columnMetadata); + } + } + } + + private void checkUnsupportedOperationsForFSTIndex(ColumnMetadata columnMetadata) { + String column = columnMetadata.getColumnName(); + if (columnMetadata.getDataType() != FieldSpec.DataType.STRING) { + throw new UnsupportedOperationException("FST index is currently only supported on STRING columns: " + column); + } + + if (!columnMetadata.hasDictionary()) { + throw new UnsupportedOperationException("FST index is currently only supported on dictionary encoded columns: " + column); + } + + if (!columnMetadata.isSingleValue()) { + throw new UnsupportedOperationException( + "Text index is currently not supported on multi-value columns: " + column); + } + } + + public void createFSTIndexesOnSegmentLoad() + throws Exception { + for (ColumnMetadata columnMetadata : _fstIndexColumns) { + checkUnsupportedOperationsForFSTIndex(columnMetadata); + createFSTIndexForColumn(columnMetadata); + } + } + + private BaseImmutableDictionary getDictionaryReader(ColumnMetadata columnMetadata) + throws IOException { + PinotDataBuffer dictionaryBuffer = + _segmentWriter.getIndexFor(columnMetadata.getColumnName(), ColumnIndexType.DICTIONARY); + return new StringDictionary(dictionaryBuffer, columnMetadata.getCardinality(), columnMetadata.getColumnMaxLength(), + (byte) columnMetadata.getPaddingCharacter()); + } + + private void createFSTIndexForColumn(ColumnMetadata columnMetadata) throws IOException { + String column = columnMetadata.getColumnName(); + boolean hasDictionary = columnMetadata.hasDictionary(); + + if (!hasDictionary) { + return; + } + + if (_segmentWriter.hasIndexFor(column, ColumnIndexType.FST_INDEX)) { + // Skip creating text index if already exists. + LOGGER.info("Found text index for column: {}, in segment: {}", column, _segmentName); Review comment: done ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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