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filter_expr.go
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/
filter_expr.go
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// Copyright 2023 The Blocky Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package expr
// Compile-time check to verify that FilterExpr implements Expr.
var _ Expr = (FilterExpr)(nil)
// FilterExpr is a filter expression that can be evaluated.
type FilterExpr interface {
// Complexity returns approximate complexity of the expression.
// It is used to estimate the cost of the expression.
// The complexity is a number of nodes in the expression tree,
// increased by field defined complexity.
// Each expression evaluates its complexity based on its rules.
Complexity() int64
// Free releases expression resources.
// No further calls to the expression are allowed after calling Free.
// This should release the resource related to the expression back to the pool.
Free()
// Equals returns true if the expression is equal to the other expression.
Equals(other Expr) bool
// Clone returns a copy of the expression.
Clone() Expr
isFilterExpr()
}