Function expr_to_sql

datafusion/sql/src/unparser/expr.rs:85–88

Convert a DataFusion [`Expr`] to [`ast::Expr`] This function is the opposite of [`SqlToRel::sql_to_expr`] and can be used to, among other things, convert [`Expr`]s to SQL strings. Such strings could be used to pass filters or other expressions to another SQL engine. # Errors Throws an error if [`Expr`] can not be represented by an [`ast::Expr`] # See Also [`Unparser`] for more control over th

(expr: &Expr)

/// [`plan_to_sql`]: crate::unparser::plan_to_sql
/// [`LogicalPlan`]: datafusion_expr::logical_plan::LogicalPlan
pub fn expr_to_sql(expr: &Expr) -> Result<ast::Expr> {
    let unparser = Unparser::default();
    unparser.expr_to_sql(expr)
}

const LOWEST: &BinaryOperator = &BinaryOperator::Or;
// Closest precedence we have to IS operator is BitwiseAnd (any other) in PG docs