uqa-sql 0.5.2

PostgreSQL-compatible SQL compiler built on libpg_query
Documentation 
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//
// Unified Query Algebra
//
// Copyright (c) 2023-2026 Cognica, Inc.
//

//! Expression traversal shared by stored statement dependency binding.

use super::{
    BTreeSet, Expr, ExpressionCallback, ProjectionCallback, SQLError, Statement, StoredAstVisitor,
};

pub fn visit_stored_expression(
    expression: &mut Expr,
    visit: ExpressionCallback<'_>,
) -> Result<(), SQLError> {
    StoredAstVisitor {
        source: None,
        merge: None,
        expression: Some(visit),
        projection: None,
        ty: None,
        relation: &mut |_: &mut String| Ok(()),
        routine: &mut |_: &mut String, _: Option<&mut Option<crate::ast::FunctionBinding>>| Ok(()),
    }
    .bind_expr(expression, &BTreeSet::new())
}

pub fn visit_stored_statement_expressions(
    statement: &mut Statement,
    visit: ExpressionCallback<'_>,
) -> Result<(), SQLError> {
    StoredAstVisitor {
        source: None,
        merge: None,
        expression: Some(visit),
        projection: None,
        ty: None,
        relation: &mut |_: &mut String| Ok(()),
        routine: &mut |_: &mut String, _: Option<&mut Option<crate::ast::FunctionBinding>>| Ok(()),
    }
    .bind_statement(statement)
}

/// Visit each select list or `RETURNING` item of a stored statement before its expression, and each expression in the order of the other visits.
pub fn visit_stored_statement_projections(
    statement: &mut Statement,
    projection: ProjectionCallback<'_>,
    expression: ExpressionCallback<'_>,
) -> Result<(), SQLError> {
    StoredAstVisitor {
        source: None,
        merge: None,
        expression: Some(expression),
        projection: Some(projection),
        ty: None,
        relation: &mut |_: &mut String| Ok(()),
        routine: &mut |_: &mut String, _: Option<&mut Option<crate::ast::FunctionBinding>>| Ok(()),
    }
    .bind_statement(statement)
}