lance-encoding 4.0.0

Encoders and decoders for the Lance file format
Documentation 
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// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: Copyright The Lance Authors

syntax = "proto3";

package lance.table;

// NOTE: Do *NOT* add new index details here.  Add them to the index.proto file instead.
// This file is in the lance.table package namespace while the index.proto file is in the
// lance.index package namespace.
//
// These are only here for forward compatibility.  Older versions of Lance expect btree indexes
// to have lance.table in the package namespace.
//
// If you need to modify these messages (e.g. to add new fields to btree or bitmap) then
// it is ok to modify them here.

// Currently many of these are empty messages because all needed details are either hard-coded (e.g.
// filenames) or stored in the index itself.  However, we may want to add more details in the
// future, in particular we can add details that may be useful for planning queries (e.g. don't
// force us to load the index until we know we can make use of it)

message BTreeIndexDetails {}
message BitmapIndexDetails {}
message LabelListIndexDetails {}
message NGramIndexDetails {}
message ZoneMapIndexDetails {}
message InvertedIndexDetails {
  // Marking this field as optional as old versions of the index store blank details and we
  // need to make sure we have a proper optional field to detect this.
  optional string base_tokenizer = 1;
  string language = 2;
  bool with_position = 3;
  optional uint32 max_token_length = 4;
  bool lower_case = 5;
  bool stem = 6;
  bool remove_stop_words = 7;
  bool ascii_folding = 8;
  uint32 min_ngram_length = 9;
  uint32 max_ngram_length = 10;
  bool prefix_only = 11;
}