Function IsConst

pkg/sql/sem/tree/normalize.go:846–849

IsConst returns whether the expression is constant. A constant expression does not contain variables, as defined by ContainsVars, nor impure functions.

(evalCtx *EvalContext, expr Expr)

// IsConst returns whether the expression is constant. A constant expression
// does not contain variables, as defined by ContainsVars, nor impure functions.
func IsConst(evalCtx *EvalContext, expr Expr) bool {
	v := isConstVisitor{ctx: evalCtx}
	return v.run(expr)
}

// fastIsConstVisitor is similar to isConstVisitor, but it only visits
// at most two levels of the tree (with one exception, see below).