Jackie-Jiang commented on a change in pull request #8384:
URL: https://github.com/apache/pinot/pull/8384#discussion_r834688008



##########
File path: 
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/readers/text/NativeTextIndexReader.java
##########
@@ -0,0 +1,141 @@
+/**
+ * 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.segment.local.segment.index.readers.text;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.Collections;
+import java.util.PrimitiveIterator;
+import org.apache.avro.util.ByteBufferInputStream;
+import 
org.apache.pinot.segment.local.segment.index.readers.BitmapInvertedIndexReader;
+import org.apache.pinot.segment.local.utils.nativefst.FST;
+import org.apache.pinot.segment.local.utils.nativefst.ImmutableFST;
+import org.apache.pinot.segment.local.utils.nativefst.NativeTextIndexCreator;
+import org.apache.pinot.segment.local.utils.nativefst.utils.RegexpMatcher;
+import org.apache.pinot.segment.spi.index.reader.TextIndexReader;
+import org.apache.pinot.segment.spi.memory.PinotDataBuffer;
+import org.apache.pinot.segment.spi.store.SegmentDirectoryPaths;
+import org.roaringbitmap.RoaringBitmapWriter;
+import org.roaringbitmap.buffer.ImmutableRoaringBitmap;
+import org.roaringbitmap.buffer.MutableRoaringBitmap;
+import org.slf4j.LoggerFactory;
+
+
+public class NativeTextIndexReader implements TextIndexReader {
+  private static final org.slf4j.Logger LOGGER = 
LoggerFactory.getLogger(NativeTextIndexReader.class);

Review comment:
       (minor) Import `org.slf4j.Logger`

##########
File path: 
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/creator/impl/SegmentColumnarIndexCreator.java
##########
@@ -211,7 +208,15 @@ public void init(SegmentGeneratorConfig 
segmentCreationSpec, SegmentIndexCreatio
       }
 
       if (textIndexColumns.contains(columnName)) {
-        _textIndexCreatorMap.put(columnName, 
_indexCreatorProvider.newTextIndexCreator(context.forTextIndex(true)));
+        Map<String, String> columnProperties = 
_columnProperties.get(columnName);
+        FSTType fstType = FSTType.LUCENE;
+

Review comment:
       (minor, readability) Can we remove the empty lines in this if block? I 
find them a little bit hard to read (the logic flow for the empty line 
separated blocks are continuous)

##########
File path: 
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/loader/IndexLoadingConfig.java
##########
@@ -197,6 +198,11 @@ private void 
extractTextIndexColumnsFromTableConfig(TableConfig tableConfig) {
         String column = fieldConfig.getName();
         if (fieldConfig.getIndexType() == FieldConfig.IndexType.TEXT) {
           _textIndexColumns.add(column);
+          Map<String, String> propertiesMap = fieldConfig.getProperties();
+

Review comment:
       (minor, readability) Remove this empty line

##########
File path: 
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/readers/text/NativeTextIndexReader.java
##########
@@ -0,0 +1,141 @@
+/**
+ * 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.segment.local.segment.index.readers.text;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.Collections;
+import java.util.PrimitiveIterator;
+import org.apache.avro.util.ByteBufferInputStream;
+import 
org.apache.pinot.segment.local.segment.index.readers.BitmapInvertedIndexReader;
+import org.apache.pinot.segment.local.utils.nativefst.FST;
+import org.apache.pinot.segment.local.utils.nativefst.ImmutableFST;
+import org.apache.pinot.segment.local.utils.nativefst.NativeTextIndexCreator;
+import org.apache.pinot.segment.local.utils.nativefst.utils.RegexpMatcher;
+import org.apache.pinot.segment.spi.index.reader.TextIndexReader;
+import org.apache.pinot.segment.spi.memory.PinotDataBuffer;
+import org.apache.pinot.segment.spi.store.SegmentDirectoryPaths;
+import org.roaringbitmap.RoaringBitmapWriter;
+import org.roaringbitmap.buffer.ImmutableRoaringBitmap;
+import org.roaringbitmap.buffer.MutableRoaringBitmap;
+import org.slf4j.LoggerFactory;
+
+
+public class NativeTextIndexReader implements TextIndexReader {
+  private static final org.slf4j.Logger LOGGER = 
LoggerFactory.getLogger(NativeTextIndexReader.class);
+
+  private final String _column;
+  private int _numDocs;
+  private final File _indexFile;
+  private final PinotDataBuffer _buffer;
+
+  private FST _fst;
+  private BitmapInvertedIndexReader _invertedIndex;
+
+  public NativeTextIndexReader(String column, File indexDir, int numDocs) {
+    _column = column;
+    _numDocs = numDocs;
+    try {
+      _indexFile = getTextIndexFile(indexDir);
+      _buffer = PinotDataBuffer.loadBigEndianFile(_indexFile);
+
+      populateIndexes();
+    } catch (Exception e) {
+      LOGGER.error("Failed to instantiate Lucene text index reader for column 
{}, exception {}", column,
+          e.getMessage());
+      throw new RuntimeException(e);
+    }
+  }
+
+  private File getTextIndexFile(File segmentIndexDir) {
+    // will return null if file does not exist
+    File file = 
SegmentDirectoryPaths.findTextIndexIndexFileNative(segmentIndexDir, _column);
+    if (file == null) {
+      throw new IllegalStateException("Failed to find text index file for 
column: " + _column);
+    }
+    return file;
+  }
+
+  private void populateIndexes() {
+    long invertedIndexLength = _buffer.getLong(4);
+    long fstDataLength = _buffer.getLong(12);
+    int numBitMaps = _buffer.getInt(20);
+
+    long fstDataStartOffset = NativeTextIndexCreator.HEADER_LENGTH;
+    long fstDataEndOffset = fstDataStartOffset + fstDataLength;
+    ByteBuffer byteBuffer = _buffer.toDirectByteBuffer(fstDataStartOffset, 
(int) fstDataLength);
+    byte[] arr = new byte[byteBuffer.remaining()];
+    // byteBuffer.get(arr);
+    try {
+      _fst = FST.read(new 
ByteBufferInputStream(Collections.singletonList(byteBuffer)), 
ImmutableFST.class, true);
+    } catch (IOException e) {
+      throw new RuntimeException(e.getMessage());
+    }
+
+    long invertedIndexEndOffset = fstDataEndOffset + invertedIndexLength;
+    _invertedIndex =
+        new BitmapInvertedIndexReader(_buffer.view(fstDataEndOffset, 
invertedIndexEndOffset, ByteOrder.BIG_ENDIAN),
+            numBitMaps);
+  }
+
+  @Override
+  public ImmutableRoaringBitmap getDictIds(String searchQuery) {
+    try {
+      RoaringBitmapWriter<MutableRoaringBitmap> writer = 
RoaringBitmapWriter.bufferWriter().get();
+      RegexpMatcher.regexMatch(searchQuery, _fst, writer::add);
+      return writer.get();
+    } catch (Exception e) {
+      throw new RuntimeException("Caught exception while running query: " + 
searchQuery, e);
+    }
+  }
+
+  @Override
+  public MutableRoaringBitmap getDocIds(String searchQuery) {

Review comment:
       As one of the basic requirement, we should support logical operators in 
the search query

##########
File path: 
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/readers/text/NativeTextIndexReader.java
##########
@@ -0,0 +1,141 @@
+/**
+ * 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.segment.local.segment.index.readers.text;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.Collections;
+import java.util.PrimitiveIterator;
+import org.apache.avro.util.ByteBufferInputStream;
+import 
org.apache.pinot.segment.local.segment.index.readers.BitmapInvertedIndexReader;
+import org.apache.pinot.segment.local.utils.nativefst.FST;
+import org.apache.pinot.segment.local.utils.nativefst.ImmutableFST;
+import org.apache.pinot.segment.local.utils.nativefst.NativeTextIndexCreator;
+import org.apache.pinot.segment.local.utils.nativefst.utils.RegexpMatcher;
+import org.apache.pinot.segment.spi.index.reader.TextIndexReader;
+import org.apache.pinot.segment.spi.memory.PinotDataBuffer;
+import org.apache.pinot.segment.spi.store.SegmentDirectoryPaths;
+import org.roaringbitmap.RoaringBitmapWriter;
+import org.roaringbitmap.buffer.ImmutableRoaringBitmap;
+import org.roaringbitmap.buffer.MutableRoaringBitmap;
+import org.slf4j.LoggerFactory;
+
+
+public class NativeTextIndexReader implements TextIndexReader {
+  private static final org.slf4j.Logger LOGGER = 
LoggerFactory.getLogger(NativeTextIndexReader.class);
+
+  private final String _column;
+  private int _numDocs;
+  private final File _indexFile;
+  private final PinotDataBuffer _buffer;
+
+  private FST _fst;
+  private BitmapInvertedIndexReader _invertedIndex;
+
+  public NativeTextIndexReader(String column, File indexDir, int numDocs) {

Review comment:
       The constructor should take a `PinotDataBuffer` instead of `column` and 
`indexDir`. The `PinotDataBuffer` can be part of the combined index file

##########
File path: 
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/readers/text/NativeTextIndexReader.java
##########
@@ -0,0 +1,141 @@
+/**
+ * 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.segment.local.segment.index.readers.text;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.Collections;
+import java.util.PrimitiveIterator;
+import org.apache.avro.util.ByteBufferInputStream;
+import 
org.apache.pinot.segment.local.segment.index.readers.BitmapInvertedIndexReader;
+import org.apache.pinot.segment.local.utils.nativefst.FST;
+import org.apache.pinot.segment.local.utils.nativefst.ImmutableFST;
+import org.apache.pinot.segment.local.utils.nativefst.NativeTextIndexCreator;
+import org.apache.pinot.segment.local.utils.nativefst.utils.RegexpMatcher;
+import org.apache.pinot.segment.spi.index.reader.TextIndexReader;
+import org.apache.pinot.segment.spi.memory.PinotDataBuffer;
+import org.apache.pinot.segment.spi.store.SegmentDirectoryPaths;
+import org.roaringbitmap.RoaringBitmapWriter;
+import org.roaringbitmap.buffer.ImmutableRoaringBitmap;
+import org.roaringbitmap.buffer.MutableRoaringBitmap;
+import org.slf4j.LoggerFactory;
+
+
+public class NativeTextIndexReader implements TextIndexReader {
+  private static final org.slf4j.Logger LOGGER = 
LoggerFactory.getLogger(NativeTextIndexReader.class);
+
+  private final String _column;
+  private int _numDocs;

Review comment:
       All the variables can be made `final`

##########
File path: 
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/readers/text/NativeTextIndexReader.java
##########
@@ -0,0 +1,141 @@
+/**
+ * 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.segment.local.segment.index.readers.text;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.Collections;
+import java.util.PrimitiveIterator;
+import org.apache.avro.util.ByteBufferInputStream;
+import 
org.apache.pinot.segment.local.segment.index.readers.BitmapInvertedIndexReader;
+import org.apache.pinot.segment.local.utils.nativefst.FST;
+import org.apache.pinot.segment.local.utils.nativefst.ImmutableFST;
+import org.apache.pinot.segment.local.utils.nativefst.NativeTextIndexCreator;
+import org.apache.pinot.segment.local.utils.nativefst.utils.RegexpMatcher;
+import org.apache.pinot.segment.spi.index.reader.TextIndexReader;
+import org.apache.pinot.segment.spi.memory.PinotDataBuffer;
+import org.apache.pinot.segment.spi.store.SegmentDirectoryPaths;
+import org.roaringbitmap.RoaringBitmapWriter;
+import org.roaringbitmap.buffer.ImmutableRoaringBitmap;
+import org.roaringbitmap.buffer.MutableRoaringBitmap;
+import org.slf4j.LoggerFactory;
+
+
+public class NativeTextIndexReader implements TextIndexReader {
+  private static final org.slf4j.Logger LOGGER = 
LoggerFactory.getLogger(NativeTextIndexReader.class);
+
+  private final String _column;
+  private int _numDocs;
+  private final File _indexFile;
+  private final PinotDataBuffer _buffer;
+
+  private FST _fst;
+  private BitmapInvertedIndexReader _invertedIndex;
+
+  public NativeTextIndexReader(String column, File indexDir, int numDocs) {
+    _column = column;
+    _numDocs = numDocs;
+    try {
+      _indexFile = getTextIndexFile(indexDir);
+      _buffer = PinotDataBuffer.loadBigEndianFile(_indexFile);
+
+      populateIndexes();
+    } catch (Exception e) {
+      LOGGER.error("Failed to instantiate Lucene text index reader for column 
{}, exception {}", column,
+          e.getMessage());
+      throw new RuntimeException(e);
+    }
+  }
+
+  private File getTextIndexFile(File segmentIndexDir) {
+    // will return null if file does not exist
+    File file = 
SegmentDirectoryPaths.findTextIndexIndexFileNative(segmentIndexDir, _column);
+    if (file == null) {
+      throw new IllegalStateException("Failed to find text index file for 
column: " + _column);
+    }
+    return file;
+  }
+
+  private void populateIndexes() {
+    long invertedIndexLength = _buffer.getLong(4);
+    long fstDataLength = _buffer.getLong(12);
+    int numBitMaps = _buffer.getInt(20);
+
+    long fstDataStartOffset = NativeTextIndexCreator.HEADER_LENGTH;
+    long fstDataEndOffset = fstDataStartOffset + fstDataLength;
+    ByteBuffer byteBuffer = _buffer.toDirectByteBuffer(fstDataStartOffset, 
(int) fstDataLength);
+    byte[] arr = new byte[byteBuffer.remaining()];
+    // byteBuffer.get(arr);
+    try {
+      _fst = FST.read(new 
ByteBufferInputStream(Collections.singletonList(byteBuffer)), 
ImmutableFST.class, true);
+    } catch (IOException e) {
+      throw new RuntimeException(e.getMessage());
+    }
+
+    long invertedIndexEndOffset = fstDataEndOffset + invertedIndexLength;
+    _invertedIndex =
+        new BitmapInvertedIndexReader(_buffer.view(fstDataEndOffset, 
invertedIndexEndOffset, ByteOrder.BIG_ENDIAN),
+            numBitMaps);
+  }
+
+  @Override
+  public ImmutableRoaringBitmap getDictIds(String searchQuery) {
+    try {

Review comment:
       Should throw `UnsupportedException` here as we should never ask for 
dictionary ids from text index (the returned dictionary id is not the 
dictionary id for the column, but for the tokens)

##########
File path: 
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/utils/nativefst/NativeTextIndexCreator.java
##########
@@ -0,0 +1,173 @@
+/**
+ * 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.segment.local.utils.nativefst;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.TreeMap;
+import org.apache.commons.io.FileUtils;
+import org.apache.lucene.analysis.Analyzer;
+import org.apache.lucene.analysis.TokenStream;
+import org.apache.lucene.analysis.standard.StandardAnalyzer;
+import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
+import 
org.apache.pinot.segment.local.segment.creator.impl.inv.BitmapInvertedIndexWriter;
+import 
org.apache.pinot.segment.local.segment.creator.impl.text.LuceneTextIndexCreator;
+import org.apache.pinot.segment.local.utils.nativefst.builder.FSTBuilder;
+import org.apache.pinot.segment.spi.V1Constants;
+import org.apache.pinot.segment.spi.index.creator.TextIndexCreator;
+import org.roaringbitmap.Container;
+import org.roaringbitmap.RoaringBitmap;
+import org.roaringbitmap.RoaringBitmapWriter;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+
+
+public class NativeTextIndexCreator implements TextIndexCreator {
+    static final String TEMP_DIR_SUFFIX = ".nativetext.idx.tmp";
+    static final String FST_FILE_NAME = "native.fst";
+    static final String INVERTED_INDEX_FILE_NAME = "inverted.index.buf";
+    public static final int HEADER_LENGTH = 24;
+
+    private String _columnName;
+    private FSTBuilder _fstBuilder;
+    private final File _indexFile;
+    private final File _tempDir;
+    private final File _fstIndexFile;
+    private final File _invertedIndexFile;
+    final Map<String, RoaringBitmapWriter<RoaringBitmap>> _postingListMap = 
new TreeMap<>();
+    final RoaringBitmapWriter.Wizard<Container, RoaringBitmap> 
_bitmapWriterWizard = RoaringBitmapWriter.writer();
+    private int _nextDocId = 0;
+    private int _fstDataSize;
+    private int _numBitMaps;
+
+    public NativeTextIndexCreator(String column, File indexDir)
+            throws IOException {
+        _columnName = column;
+        _fstBuilder = new FSTBuilder();
+        _indexFile = new File(indexDir, column + 
V1Constants.Indexes.NATIVE_TEXT_INDEX_FILE_EXTENSION);
+        _tempDir = new File(indexDir, column + TEMP_DIR_SUFFIX);
+        if (_tempDir.exists()) {
+            FileUtils.cleanDirectory(_tempDir);
+        } else {
+            FileUtils.forceMkdir(_tempDir);
+        }
+        _fstIndexFile = new File(_tempDir, FST_FILE_NAME);
+        _invertedIndexFile = new File(_tempDir, INVERTED_INDEX_FILE_NAME);
+    }
+
+    @Override
+    public void add(String document) {
+        List<String> tokens;
+        try {
+            tokens = analyze(document, new 
StandardAnalyzer(LuceneTextIndexCreator.ENGLISH_STOP_WORDS_SET));
+        } catch (IOException e) {
+            throw new RuntimeException(e.getMessage());
+        }
+
+        for (String token : tokens) {
+            addToPostingList(token);
+        }
+
+        _nextDocId++;
+    }
+
+    @Override
+    public void add(String[] documents, int length) {
+        for (int i = 0; i < length; i++) {
+            add(documents[i]);
+        }

Review comment:
       +1 on not support MV at present. We may add another format when adding 
the MV support in the future




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