mito2/sst/parquet/
plain_format.rs

1// Copyright 2023 Greptime Team
2//
3// Licensed under the Apache License, Version 2.0 (the "License");
4// you may not use this file except in compliance with the License.
5// You may obtain a copy of the License at
6//
7//     http://www.apache.org/licenses/LICENSE-2.0
8//
9// Unless required by applicable law or agreed to in writing, software
10// distributed under the License is distributed on an "AS IS" BASIS,
11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12// See the License for the specific language governing permissions and
13// limitations under the License.
14
15//! Format to store in parquet.
16//!
17//! We store two additional internal columns at last:
18//! - `__sequence`, the sequence number of a row. Type: uint64
19//! - `__op_type`, the op type of the row. Type: uint8
20//!
21//! We store other columns in the same order as [RegionMetadata::field_columns()](store_api::metadata::RegionMetadata::field_columns()).
22//!
23
24/// Number of columns that have fixed positions.
25///
26/// Contains all internal columns.
27pub(crate) const PLAIN_FIXED_POS_COLUMN_NUM: usize = 2;
mito2/sst/parquet/plain_format.rs

mito2/sst/parquet/
plain_format.rs
