kip-sql 0.0.1-alpha.8

build the SQL layer of KipDB database
Documentation 
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use crate::planner::operator::Operator;

#[allow(dead_code)]
pub enum PatternChildrenPredicate {
    /// all childrens nodes match all
    Recursive,
    /// match many pattern at the time
    Predicate(Vec<Pattern>),
    /// childrens jump out match
    None,
}

/// The pattern tree to match a plan tree. It defined in `Rule` and used in `PatternMatcher`.
pub struct Pattern {
    /// The root node predicate, not contains the children.
    pub predicate: fn(&Operator) -> bool,
    /// The children's predicate of current node.
    pub children: PatternChildrenPredicate,
}

pub trait PatternMatcher {
    fn match_opt_expr(&self) -> bool;
}