proof-of-sql 0.128.2

use super::{add_subtract_columns, DecimalProofExpr, DynProofExpr, ProofExpr};
use crate::{
    base::{
        database::{
            try_add_subtract_column_types, Column, ColumnRef, ColumnType, LiteralValue, Table,
        },
        map::{IndexMap, IndexSet},
        proof::{PlaceholderResult, ProofError},
        scalar::Scalar,
    },
    sql::{
        proof::{FinalRoundBuilder, VerificationBuilder},
        AnalyzeError, AnalyzeResult,
    },
    utils::log,
};
use alloc::{boxed::Box, string::ToString};
use bumpalo::Bump;
use serde::{Deserialize, Serialize};
use sqlparser::ast::Ident;

/// Provable numerical `-` expression
#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
pub struct SubtractExpr {
    lhs: Box<DynProofExpr>,
    rhs: Box<DynProofExpr>,
}

impl SubtractExpr {
    /// Create numerical `-` expression
    pub fn try_new(lhs: Box<DynProofExpr>, rhs: Box<DynProofExpr>) -> AnalyzeResult<Self> {
        let left_datatype = lhs.data_type();
        let right_datatype = rhs.data_type();
        try_add_subtract_column_types(left_datatype, right_datatype)
            .map(|_| Self { lhs, rhs })
            .map_err(|_| AnalyzeError::DataTypeMismatch {
                left_type: left_datatype.to_string(),
                right_type: right_datatype.to_string(),
            })
    }

    /// Get the left-hand side expression
    pub fn lhs(&self) -> &DynProofExpr {
        &self.lhs
    }

    /// Get the right-hand side expression
    pub fn rhs(&self) -> &DynProofExpr {
        &self.rhs
    }
}

impl ProofExpr for SubtractExpr {
    fn data_type(&self) -> ColumnType {
        try_add_subtract_column_types(self.lhs.data_type(), self.rhs.data_type())
            .expect("Failed to add/subtract column types")
    }

    fn first_round_evaluate<'a, S: Scalar>(
        &self,
        alloc: &'a Bump,
        table: &Table<'a, S>,
        params: &[LiteralValue],
    ) -> PlaceholderResult<Column<'a, S>> {
        let lhs_column: Column<'a, S> = self.lhs.first_round_evaluate(alloc, table, params)?;
        let rhs_column: Column<'a, S> = self.rhs.first_round_evaluate(alloc, table, params)?;
        let res = add_subtract_columns(lhs_column, rhs_column, alloc, true);
        Ok(Column::Decimal75(self.precision(), self.scale(), res))
    }

    #[tracing::instrument(
        name = "proofs.sql.ast.subtract_expr.final_round_evaluate",
        level = "info",
        skip_all
    )]
    fn final_round_evaluate<'a, S: Scalar>(
        &self,
        builder: &mut FinalRoundBuilder<'a, S>,
        alloc: &'a Bump,
        table: &Table<'a, S>,
        params: &[LiteralValue],
    ) -> PlaceholderResult<Column<'a, S>> {
        log::log_memory_usage("Start");

        let lhs_column: Column<'a, S> = self
            .lhs
            .final_round_evaluate(builder, alloc, table, params)?;
        let rhs_column: Column<'a, S> = self
            .rhs
            .final_round_evaluate(builder, alloc, table, params)?;
        let res = add_subtract_columns(lhs_column, rhs_column, alloc, true);

        log::log_memory_usage("End");

        Ok(Column::Decimal75(self.precision(), self.scale(), res))
    }

    fn verifier_evaluate<S: Scalar>(
        &self,
        builder: &mut impl VerificationBuilder<S>,
        accessor: &IndexMap<Ident, S>,
        chi_eval: S,
        params: &[LiteralValue],
    ) -> Result<S, ProofError> {
        let lhs_eval = self
            .lhs
            .verifier_evaluate(builder, accessor, chi_eval, params)?;
        let rhs_eval = self
            .rhs
            .verifier_evaluate(builder, accessor, chi_eval, params)?;
        Ok(lhs_eval - rhs_eval)
    }

    fn get_column_references(&self, columns: &mut IndexSet<ColumnRef>) {
        self.lhs.get_column_references(columns);
        self.rhs.get_column_references(columns);
    }
}

impl DecimalProofExpr for SubtractExpr {}