本文整理汇总了Golang中github.com/couchbase/query/expression.Expression.EquivalentTo方法的典型用法代码示例。如果您正苦于以下问题：Golang Expression.EquivalentTo方法的具体用法？Golang Expression.EquivalentTo怎么用？Golang Expression.EquivalentTo使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/couchbase/query/expression.Expression的用法示例。
在下文中一共展示了Expression.EquivalentTo方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: constrainAggregate
/*
Constrain the WHERE condition to reflect the aggregate query. For
example:
SELECT AVG(v) FROM widget w;
is rewritten as:
SELECT AVG(v) FROM widget w WHERE v IS NOT NULL;
This enables the query to use an index on v.
*/
func constrainAggregate(cond expression.Expression, aggs map[string]algebra.Aggregate) expression.Expression {
var first expression.Expression
for _, agg := range aggs {
if first == nil {
first = agg.Operand()
if first == nil {
return cond
}
continue
}
op := agg.Operand()
if op == nil || !first.EquivalentTo(op) {
return cond
}
}
if first == nil {
return cond
}
var constraint expression.Expression = expression.NewIsNotNull(first)
if cond != nil {
constraint = expression.NewAnd(cond, constraint)
}
return constraint
}示例2: newSubsetDefault
func newSubsetDefault(expr expression.Expression) *subsetDefault {
rv := &subsetDefault{}
rv.test = func(expr2 expression.Expression) (bool, error) {
value2 := expr2.Value()
if value2 != nil {
return value2.Truth(), nil
}
if expr.EquivalentTo(expr2) {
return true, nil
}
switch expr2 := expr2.(type) {
case *expression.And:
for _, op := range expr2.Operands() {
if !SubsetOf(expr, op) {
return false, nil
}
}
return true, nil
case *expression.Or:
for _, op := range expr2.Operands() {
if SubsetOf(expr, op) {
return true, nil
}
}
return false, nil
case *expression.IsNotMissing:
return expr.PropagatesMissing() &&
expr.DependsOn(expr2.Operand()), nil
case *expression.IsNotNull:
return expr.PropagatesNull() &&
expr.DependsOn(expr2.Operand()), nil
case *expression.IsValued:
return expr.PropagatesNull() &&
expr.DependsOn(expr2.Operand()), nil
}
return false, nil
}
return rv
}示例3: LessThanOrEquals
func LessThanOrEquals(expr1, expr2 expression.Expression) bool {
return LessThan(expr1, expr2) || expr1.EquivalentTo(expr2)
}