[GitHub] [pinot] mayankshriv commented on a change in pull request #8016: Implement Real Time Mutable FST

[GitBox <gi...@apache.org>]

mayankshriv commented on a change in pull request #8016:
URL: https://github.com/apache/pinot/pull/8016#discussion_r786277106



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File path: pinot-segment-local/src/main/java/org/apache/pinot/segment/local/utils/nativefst/mutablefst/MutableFST.java
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@@ -0,0 +1,66 @@
+/**
+ * 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.mutablefst;
+
+
+/**
+ * A mutable FST represents a FST which can have arbitrary inputs added to it at
+ * any given point of time. Unlike a normal FST which is build once read many, mutable
+ * FST can be concurrently written to and read from. Mutable FST provides real time search
+ * i.e. search will see words as they are added without needing a flush.
+ *
+ * Unlike a normal FST, mutable FST does not require the entire input beforehand nor
+ * does it require the input to be sorted. Single word additions work well with
+ * mutable FST.
+ *
+ * The reason as to why normal FST and mutable FST have different interfaces is because

Review comment:
       Does this mean that there will have to be separate code to use mutable vs immutable FST? An abstraction that avoids that would be great.




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