mito2/memtable/bulk/
context.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//! Context for iterating bulk memtable.
16
17use std::collections::VecDeque;
18use std::sync::Arc;
19
20use mito_codec::row_converter::{DensePrimaryKeyCodec, build_primary_key_codec};
21use parquet::file::metadata::ParquetMetaData;
22use store_api::metadata::RegionMetadataRef;
23use store_api::storage::ColumnId;
24use table::predicate::Predicate;
25
26use crate::sst::parquet::file_range::RangeBase;
27use crate::sst::parquet::flat_format::FlatReadFormat;
28use crate::sst::parquet::format::ReadFormat;
29use crate::sst::parquet::reader::SimpleFilterContext;
30use crate::sst::parquet::stats::RowGroupPruningStats;
31
32pub(crate) type BulkIterContextRef = Arc<BulkIterContext>;
33
34pub struct BulkIterContext {
35    pub(crate) base: RangeBase,
36    pub(crate) predicate: Option<Predicate>,
37}
38
39impl BulkIterContext {
40    pub fn new(
41        region_metadata: RegionMetadataRef,
42        projection: &Option<&[ColumnId]>,
43        predicate: Option<Predicate>,
44    ) -> Self {
45        let codec = build_primary_key_codec(&region_metadata);
46
47        let simple_filters = predicate
48            .as_ref()
49            .iter()
50            .flat_map(|predicate| {
51                predicate
52                    .exprs()
53                    .iter()
54                    .filter_map(|expr| SimpleFilterContext::new_opt(&region_metadata, None, expr))
55            })
56            .collect();
57
58        let read_format = build_read_format(region_metadata, projection, true);
59
60        Self {
61            base: RangeBase {
62                filters: simple_filters,
63                read_format,
64                codec,
65                // we don't need to compat batch since all batch in memtable have the same schema.
66                compat_batch: None,
67            },
68            predicate,
69        }
70    }
71
72    /// Prunes row groups by stats.
73    pub(crate) fn row_groups_to_read(&self, file_meta: &Arc<ParquetMetaData>) -> VecDeque<usize> {
74        let region_meta = self.base.read_format.metadata();
75        let row_groups = file_meta.row_groups();
76        // expected_metadata is set to None since we always expect region metadata of memtable is up-to-date.
77        let stats = RowGroupPruningStats::new(row_groups, &self.base.read_format, None);
78        if let Some(predicate) = self.predicate.as_ref() {
79            predicate
80                .prune_with_stats(&stats, region_meta.schema.arrow_schema())
81                .iter()
82                .zip(0..file_meta.num_row_groups())
83                .filter_map(|(selected, row_group)| {
84                    if !*selected {
85                        return None;
86                    }
87                    Some(row_group)
88                })
89                .collect::<VecDeque<_>>()
90        } else {
91            (0..file_meta.num_row_groups()).collect()
92        }
93    }
94
95    pub(crate) fn read_format(&self) -> &ReadFormat {
96        &self.base.read_format
97    }
98}
99
100fn build_read_format(
101    region_metadata: RegionMetadataRef,
102    projection: &Option<&[ColumnId]>,
103    flat_format: bool,
104) -> ReadFormat {
105    if let Some(column_ids) = &projection {
106        ReadFormat::new(region_metadata, column_ids.iter().copied(), flat_format)
107    } else {
108        // No projection, lists all column ids to read.
109        ReadFormat::new(
110            region_metadata.clone(),
111            region_metadata
112                .column_metadatas
113                .iter()
114                .map(|col| col.column_id),
115            flat_format,
116        )
117    }
118}
mito2/memtable/bulk/context.rs

mito2/memtable/bulk/
context.rs
