1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
use std::collections::HashMap;
use std::fmt;
use itertools::Itertools;
use serde::Serialize;
use super::*;
use crate::catalog::{ColumnDesc, ColumnId, TableRefId};
use crate::types::DataTypeKind;
use crate::v1::binder::ExprVisitor;
use crate::v1::optimizer::logical_plan_rewriter::ExprRewriter;
#[derive(Debug, Clone, Serialize)]
pub struct LogicalTableScan {
table_ref_id: TableRefId,
column_ids: Vec<ColumnId>,
column_descs: Vec<ColumnDesc>,
with_row_handler: bool,
is_sorted: bool,
expr: Option<BoundExpr>,
}
impl LogicalTableScan {
pub fn new(
table_ref_id: TableRefId,
column_ids: Vec<ColumnId>,
column_descs: Vec<ColumnDesc>,
with_row_handler: bool,
is_sorted: bool,
expr: Option<BoundExpr>,
) -> Self {
Self {
table_ref_id,
column_ids,
column_descs,
with_row_handler,
is_sorted,
expr,
}
}
pub fn table_ref_id(&self) -> TableRefId {
self.table_ref_id
}
pub fn column_ids(&self) -> &[u32] {
self.column_ids.as_ref()
}
pub fn column_descs(&self) -> &[ColumnDesc] {
self.column_descs.as_ref()
}
pub fn with_row_handler(&self) -> bool {
self.with_row_handler
}
pub fn is_sorted(&self) -> bool {
self.is_sorted
}
pub fn expr(&self) -> Option<&BoundExpr> {
self.expr.as_ref()
}
}
impl PlanTreeNodeLeaf for LogicalTableScan {}
impl_plan_tree_node_for_leaf!(LogicalTableScan);
impl PlanNode for LogicalTableScan {
fn schema(&self) -> Vec<ColumnDesc> {
let mut descs = self.column_descs.clone();
if self.with_row_handler {
descs.push(ColumnDesc::new(
DataType::new(DataTypeKind::Int32, false),
"row_handler".to_string(),
false,
));
}
descs
}
fn estimated_cardinality(&self) -> usize {
1
}
fn prune_col(&self, required_cols: BitSet) -> PlanRef {
let mut visitor = CollectRequiredCols(BitSet::new());
if self.expr.is_some() {
visitor.visit_expr(self.expr.as_ref().unwrap());
}
let filter_cols = visitor.0;
let mut need_rewrite = false;
if !filter_cols.is_empty()
&& filter_cols
.iter()
.any(|index| !required_cols.contains(index))
{
need_rewrite = true;
}
let mut idx_table = HashMap::new();
let (mut column_ids, mut column_descs): (Vec<_>, Vec<_>) = required_cols
.iter()
.filter(|&id| id < self.column_ids.len())
.map(|id| {
idx_table.insert(id, idx_table.len());
(self.column_ids[id], self.column_descs[id].clone())
})
.unzip();
let mut offset = column_ids.len();
let mut expr = self.expr.clone();
if need_rewrite {
let (f_column_ids, f_column_descs): (Vec<_>, Vec<_>) = filter_cols
.iter()
.filter(|&id| id < self.column_ids.len() && !required_cols.contains(id))
.map(|id| {
idx_table.insert(id, offset);
offset += 1;
(self.column_ids[id], self.column_descs[id].clone())
})
.unzip();
column_ids.extend(f_column_ids.into_iter());
column_descs.extend(f_column_descs.into_iter());
Mapper(idx_table).rewrite_expr(expr.as_mut().unwrap());
}
let new_scan = Self {
table_ref_id: self.table_ref_id,
column_ids,
column_descs: column_descs.clone(),
with_row_handler: self.with_row_handler,
is_sorted: self.is_sorted,
expr,
}
.into_plan_ref();
if need_rewrite {
let project_expressions = (0..required_cols.len())
.into_iter()
.map(|index| {
BoundExpr::InputRef(BoundInputRef {
index,
return_type: column_descs[index].datatype().clone(),
})
})
.collect();
LogicalProjection::new(project_expressions, new_scan).into_plan_ref()
} else {
new_scan
}
}
}
impl fmt::Display for LogicalTableScan {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
writeln!(
f,
"LogicalTableScan: table #{}, columns [{}], with_row_handler: {}, is_sorted: {}, expr: {}",
self.table_ref_id.table_id,
self.column_ids.iter().map(ToString::to_string).join(", "),
self.with_row_handler,
self.is_sorted,
self.expr.clone().map_or_else(|| "None".to_string(), |expr| format!("{:?}", expr))
)
}
}