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interface.go
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interface.go
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// Licensed to Apache Software Foundation (ASF) under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Apache Software Foundation (ASF) licenses this file to you 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
//
// http://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 logical
import (
"fmt"
)
// UnresolvedPlan denotes an logical expression.
// It could be analyzed to a Plan(executable operation) with the Schema.
type UnresolvedPlan interface {
Analyze(Schema) (Plan, error)
}
// Plan is the executable operation. It belongs to a execution tree.
type Plan interface {
fmt.Stringer
Children() []Plan
Schema() Schema
}
// Expr represents a predicate in criteria.
type Expr interface {
fmt.Stringer
DataType() int32
Equal(Expr) bool
}
// LiteralExpr allows getting raw data represented as bytes.
type LiteralExpr interface {
Expr
Bytes() [][]byte
}
// ComparableExpr allows comparing Expr and Expr arrays.
type ComparableExpr interface {
LiteralExpr
Compare(LiteralExpr) (int, bool)
BelongTo(LiteralExpr) bool
Contains(LiteralExpr) bool
}