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query(fuse): limit push down respect orders #4818

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merged 5 commits into from
Apr 13, 2022
Merged

query(fuse): limit push down respect orders #4818

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e6bad62
query(fuse): limit push down respect orders
sundy-li Apr 12, 2022
31657f5
query(fuse): limit push down respect orders
sundy-li Apr 12, 2022
b637da3
fix tests
sundy-li Apr 13, 2022
776e8f6
better codes
sundy-li Apr 13, 2022
c143239
Merge branch 'main' into orderby-limit
mergify[bot] Apr 13, 2022
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11 changes: 7 additions & 4 deletions query/src/storages/fuse/operations/read_partitions.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -75,10 +75,13 @@ impl FuseTable {
blocks_metas: &[BlockMeta],
push_downs: Option<Extras>,
) -> (Statistics, Partitions) {
let limit = push_downs
.as_ref()
.and_then(|p| p.limit)
.unwrap_or(usize::MAX);
let mut limit = usize::MAX;
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How about:

let limit = push_downs
            .as_ref()
            .filter(|p| p.order_by.is_empty())
            .and_then(|p| p.limit)
            .unwrap_or(usize::MAX);

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How about:

let limit = push_downs
            .as_ref()
            .filter(|p| p.order_by.is_empty())
            .and_then(|p| p.limit)
            .unwrap_or(usize::MAX);

That's great, I did not come up with this idea.

if let Some(p) = push_downs.as_ref() {
if p.order_by.is_empty() && p.limit.is_some() {
limit = p.limit.unwrap();
}
}

let (mut statistics, partitions) = match &push_downs {
None => Self::all_columns_partitions(blocks_metas, limit),
Some(extras) => match &extras.projection {
Expand Down
11 changes: 6 additions & 5 deletions query/src/storages/fuse/pruning/block_pruner.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -65,11 +65,12 @@ impl BlockPruner {
return Ok(vec![]);
};

let limit = if let Some(Extras { limit: Some(l), .. }) = push_down {
*l
} else {
usize::MAX
};
let mut limit = usize::MAX;
if let Some(p) = push_down.as_ref() {
if p.order_by.is_empty() && p.limit.is_some() {
limit = p.limit.unwrap();
}
}

// Segments and blocks are accumulated concurrently, thus an atomic counter is used
// to **try** collecting as less blocks as possible. But concurrency is preferred to
Expand Down
6 changes: 6 additions & 0 deletions tests/suites/0_stateless/03_dml/03_0004_select_order_by.result
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Expand Up @@ -25,3 +25,9 @@ Projection: (number % 3) as c1:UInt8, (number % 2) as c2:UInt8
2 0
2 1
2 0
3
4
5
6
5
4
6 changes: 6 additions & 0 deletions tests/suites/0_stateless/03_dml/03_0004_select_order_by.sql
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Expand Up @@ -3,3 +3,9 @@ SELECT number, number + 3 FROM numbers_mt (1000) where number > 5 order by numbe
SELECT number%3 as c1, number%2 as c2 FROM numbers_mt (10) order by c1 desc, c2 asc;
EXPLAIN SELECT number%3 as c1, number%2 as c2 FROM numbers_mt (10) order by c1, number desc;
SELECT number%3 as c1, number%2 as c2 FROM numbers_mt (10) order by c1, number desc;

create table t1(id int);
insert into t1 select number as id from numbers(10);
select * from t1 order by id asc limit 3,3;
select * from t1 order by id desc limit 3,3;
drop table t1;