risingwave_frontend/optimizer/rule/pull_up_hop_rule.rs
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// Copyright 2024 RisingWave Labs
//
// Licensed 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.
use risingwave_common::util::column_index_mapping::ColIndexMapping;
use risingwave_pb::plan_common::JoinType;
use super::{BoxedRule, Rule};
use crate::optimizer::plan_node::{LogicalHopWindow, LogicalJoin};
use crate::utils::IndexRewriter;
pub struct PullUpHopRule {}
impl Rule for PullUpHopRule {
fn apply(&self, plan: crate::PlanRef) -> Option<crate::PlanRef> {
let join = plan.as_logical_join()?;
let (left, right, on, join_type, mut output_index) = join.clone().decompose();
let (left_input_index_on_condition, right_input_index_on_condition) =
join.input_idx_on_condition();
let (left_output_pos, right_output_pos) = {
let mut left_output_pos = vec![];
let mut right_output_pos = vec![];
output_index.iter_mut().enumerate().for_each(|(pos, idx)| {
if *idx < left.schema().len() {
left_output_pos.push(pos);
} else {
right_output_pos.push(pos);
// make right output index start from 0. We can identify left and right output
// index by the output_pos.
*idx -= left.schema().len();
}
});
(left_output_pos, right_output_pos)
};
let mut old_i2new_i = ColIndexMapping::empty(0, 0);
let mut pull_up_left = false;
let mut pull_up_right = false;
let (new_left, left_time_col, left_window_slide, left_window_size, left_window_offset) =
if let Some(hop) = left.as_logical_hop_window()
&& left_input_index_on_condition.iter().all(|&index| {
hop.output_window_start_col_idx()
.map_or(true, |v| index != v)
&& hop.output_window_end_col_idx().map_or(true, |v| index != v)
})
&& join_type != JoinType::RightAnti
&& join_type != JoinType::RightSemi
&& join_type != JoinType::RightOuter
&& join_type != JoinType::FullOuter
{
let (input, time_col, window_slide, window_size, window_offset, _) =
hop.clone().into_parts();
old_i2new_i = old_i2new_i.union(
&join
.i2l_col_mapping_ignore_join_type()
.composite(&hop.o2i_col_mapping()),
);
left_output_pos.iter().for_each(|&pos| {
output_index[pos] = hop.output2internal_col_mapping().map(output_index[pos]);
});
pull_up_left = true;
(
input,
Some(time_col),
Some(window_slide),
Some(window_size),
Some(window_offset),
)
} else {
old_i2new_i = old_i2new_i.union(&join.i2l_col_mapping_ignore_join_type());
(left, None, None, None, None)
};
let (new_right, right_time_col, right_window_slide, right_window_size, right_window_offset) =
if let Some(hop) = right.as_logical_hop_window()
&& right_input_index_on_condition.iter().all(|&index| {
hop.output_window_start_col_idx()
.map_or(true, |v| index != v)
&& hop.output_window_end_col_idx().map_or(true, |v| index != v)
})
&& join_type != JoinType::LeftAnti
&& join_type != JoinType::LeftSemi
&& join_type != JoinType::LeftOuter
&& join_type != JoinType::FullOuter
{
let (input, time_col, window_slide, window_size, window_offset, _) =
hop.clone().into_parts();
old_i2new_i = old_i2new_i.union(
&join
.i2r_col_mapping_ignore_join_type()
.composite(&hop.o2i_col_mapping())
.clone_with_offset(new_left.schema().len()),
);
right_output_pos.iter().for_each(|&pos| {
output_index[pos] = hop.output2internal_col_mapping().map(output_index[pos]);
});
pull_up_right = true;
(
input,
Some(time_col),
Some(window_slide),
Some(window_size),
Some(window_offset),
)
} else {
old_i2new_i = old_i2new_i.union(
&join
.i2r_col_mapping_ignore_join_type()
.clone_with_offset(new_left.schema().len()),
);
(right, None, None, None, None)
};
if !pull_up_left && !pull_up_right {
return None;
}
let new_output_index = {
let new_right_output_len =
if join_type == JoinType::LeftSemi || join_type == JoinType::LeftAnti {
0
} else {
new_right.schema().len()
};
let new_left_output_len =
if join_type == JoinType::RightSemi || join_type == JoinType::RightAnti {
0
} else {
new_left.schema().len()
};
// The left output index can separate into two parts:
// `left_other_column | left_window_start | letf_window_end`
// The right output index can separate into two parts:
// `right_other_column | right_window_start | right_window_end`
//
// If we pull up left, the column index will be changed to:
// `left_other_column | right_column | left_window_start | letf_window_end`,
// we need to update the index of left window start and left window end.
//
// If we pull up right and left, the column index will be changed to:
// `left_other_column | right_other_column | left_window_start | letf_window_end |
// right_window_tart | right_window_end |`, we need to update the index of
// left window start and left window end and right window start and right window end.
if pull_up_left {
left_output_pos.iter().for_each(|&pos| {
if output_index[pos] >= new_left_output_len {
output_index[pos] += new_right_output_len;
}
});
}
if pull_up_right && pull_up_left {
right_output_pos.iter().for_each(|&pos| {
if output_index[pos] < new_right_output_len {
output_index[pos] += new_left_output_len;
} else {
output_index[pos] +=
new_left_output_len + LogicalHopWindow::ADDITION_COLUMN_LEN;
}
});
} else {
right_output_pos.iter().for_each(|&pos| {
output_index[pos] += new_left_output_len;
});
}
output_index
};
let new_left_len = new_left.schema().len();
let new_cond = on.rewrite_expr(&mut IndexRewriter::new(old_i2new_i));
let new_join = LogicalJoin::new(new_left, new_right, join_type, new_cond);
let new_hop = if pull_up_left && pull_up_right {
let left_hop = LogicalHopWindow::create(
new_join.into(),
left_time_col.unwrap(),
left_window_slide.unwrap(),
left_window_size.unwrap(),
left_window_offset.unwrap(),
);
LogicalHopWindow::create(
left_hop,
right_time_col
.unwrap()
.clone_with_offset(new_left_len as isize),
right_window_slide.unwrap(),
right_window_size.unwrap(),
right_window_offset.unwrap(),
)
} else if pull_up_left {
LogicalHopWindow::create(
new_join.into(),
left_time_col.unwrap(),
left_window_slide.unwrap(),
left_window_size.unwrap(),
left_window_offset.unwrap(),
)
} else {
LogicalHopWindow::create(
new_join.into(),
right_time_col
.unwrap()
.clone_with_offset(new_left_len as isize),
right_window_slide.unwrap(),
right_window_size.unwrap(),
right_window_offset.unwrap(),
)
};
Some(
new_hop
.as_logical_hop_window()
.unwrap()
.clone_with_output_indices(new_output_index)
.into(),
)
}
}
impl PullUpHopRule {
pub fn create() -> BoxedRule {
Box::new(PullUpHopRule {})
}
}