proof_of_sql/sql/proof_plans/
table_exec.rs

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
use crate::{
    base::{
        database::{ColumnField, ColumnRef, OwnedTable, Table, TableRef},
        map::{indexset, IndexMap, IndexSet},
        proof::ProofError,
        scalar::Scalar,
    },
    sql::proof::{
        CountBuilder, FinalRoundBuilder, FirstRoundBuilder, ProofPlan, ProverEvaluate,
        VerificationBuilder,
    },
};
use alloc::vec::Vec;
use bumpalo::Bump;
use serde::{Deserialize, Serialize};

/// Source [`ProofPlan`] for (sub)queries with table source such as `SELECT col from tab;`
/// Inspired by `DataFusion` data source [`ExecutionPlan`]s such as [`ArrowExec`] and [`CsvExec`].
/// Note that we only need to load the columns we use.
#[derive(Debug, PartialEq, Serialize, Deserialize)]
pub struct TableExec {
    /// Table reference
    pub table_ref: TableRef,
    /// Schema of the table
    pub schema: Vec<ColumnField>,
}

impl TableExec {
    /// Creates a new [`TableExec`].
    #[must_use]
    pub fn new(table_ref: TableRef, schema: Vec<ColumnField>) -> Self {
        Self { table_ref, schema }
    }
}

impl ProofPlan for TableExec {
    fn count(&self, _builder: &mut CountBuilder) -> Result<(), ProofError> {
        Ok(())
    }

    #[allow(unused_variables)]
    fn verifier_evaluate<S: Scalar>(
        &self,
        builder: &mut VerificationBuilder<S>,
        accessor: &IndexMap<ColumnRef, S>,
        _result: Option<&OwnedTable<S>>,
    ) -> Result<Vec<S>, ProofError> {
        Ok(self
            .schema
            .iter()
            .map(|field| {
                let column_ref = ColumnRef::new(self.table_ref, field.name(), field.data_type());
                *accessor.get(&column_ref).expect("Column does not exist")
            })
            .collect::<Vec<_>>())
    }

    fn get_column_result_fields(&self) -> Vec<ColumnField> {
        self.schema.clone()
    }

    fn get_column_references(&self) -> IndexSet<ColumnRef> {
        self.schema
            .iter()
            .map(|field| ColumnRef::new(self.table_ref, field.name(), field.data_type()))
            .collect()
    }

    fn get_table_references(&self) -> IndexSet<TableRef> {
        indexset! {self.table_ref}
    }
}

impl ProverEvaluate for TableExec {
    #[tracing::instrument(name = "TableExec::result_evaluate", level = "debug", skip_all)]
    fn result_evaluate<'a, S: Scalar>(
        &self,
        _alloc: &'a Bump,
        table_map: &IndexMap<TableRef, Table<'a, S>>,
    ) -> Table<'a, S> {
        table_map
            .get(&self.table_ref)
            .expect("Table not found")
            .clone()
    }

    fn first_round_evaluate(&self, _builder: &mut FirstRoundBuilder) {}

    #[tracing::instrument(name = "TableExec::final_round_evaluate", level = "debug", skip_all)]
    #[allow(unused_variables)]
    fn final_round_evaluate<'a, S: Scalar>(
        &self,
        builder: &mut FinalRoundBuilder<'a, S>,
        alloc: &'a Bump,
        table_map: &IndexMap<TableRef, Table<'a, S>>,
    ) -> Table<'a, S> {
        table_map
            .get(&self.table_ref)
            .expect("Table not found")
            .clone()
    }
}