tidb compare 代码
文件路径：/types/compare.go
/ Copyright 2015 PingCAP, Inc.
/
/ 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
/
/ 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 types
import (
"math"
"time"
"github.com/pingcap/tidb/util/collate"
)
/ CompareInt64 returns an integer comparing the int64 x to y.
func CompareInt64(x, y int64) int {
if x < y {
return -1
} else if x == y {
return 0
}
return 1
}
/ CompareUint64 returns an integer comparing the uint64 x to y.
func CompareUint64(x, y uint64) int {
if x < y {
return -1
} else if x == y {
return 0
}
return 1
}
/ VecCompareUU returns []int64 comparing the []uint64 x to []uint64 y
func VecCompareUU(x, y []uint64, res []int64) {
n := len(x)
for i := 0; i < n; i++ {
if x[i] < y[i] {
res[i] = -1
} else if x[i] == y[i] {
res[i] = 0
} else {
res[i] = 1
}
}
}
/ VecCompareII returns []int64 comparing the []int64 x to []int64 y
func VecCompareII(x, y, res []int64) {
n := len(x)
for i := 0; i < n; i++ {
if x[i] < y[i] {
res[i] = -1
} else if x[i] == y[i] {
res[i] = 0
} else {
res[i] = 1
}
}
}
/ VecCompareUI returns []int64 comparing the []uint64 x to []int64y
func VecCompareUI(x []uint64, y, res []int64) {
n := len(x)
for i := 0; i < n; i++ {
if y[i] < 0 || x[i] > math.MaxInt64 {
res[i] = 1
} else if int64(x[i]) < y[i] {
res[i] = -1
} else if int64(x[i]) == y[i] {
res[i] = 0
} else {
res[i] = 1
}
}
}
/ VecCompareIU returns []int64 comparing the []int64 x to []uint64y
func VecCompareIU(x []int64, y []uint64, res []int64) {
n := len(x)
for i := 0; i < n; i++ {
if x[i] < 0 || y[i] > math.MaxInt64 {
res[i] = -1
} else if x[i] < int64(y[i]) {
res[i] = -1
} else if x[i] == int64(y[i]) {
res[i] = 0
} else {
res[i] = 1
}
}
}
/ CompareFloat64 returns an integer comparing the float64 x to y.
func CompareFloat64(x, y float64) int {
if x < y {
return -1
} else if x == y {
return 0
}
return 1
}
/ CompareString returns an integer comparing the string x to y with the specified collation and length.
func CompareString(x, y, collation string) int {
return collate.GetCollator(collation).Compare(x, y)
}
/ CompareDuration returns an integer comparing the duration x to y.
func CompareDuration(x, y time.Duration) int {
if x < y {
return -1
} else if x == y {
return 0
}
return 1
}