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bit_ops.go
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bit_ops.go
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// Copyright 2022 Dolthub, 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 expression
import (
"fmt"
"math"
"strconv"
"strings"
"unsafe"
"github.com/dolthub/vitess/go/vt/sqlparser"
"github.com/gabereiser/go-mysql-server/sql"
"github.com/gabereiser/go-mysql-server/sql/types"
)
// BitOp expressions include BIT -AND, -OR and -XOR (&, | and ^) operations
// https://dev.mysql.com/doc/refman/8.0/en/bit-functions.html
type BitOp struct {
BinaryExpression
Op string
}
// NewBitOp creates a new BitOp sql.Expression.
func NewBitOp(left, right sql.Expression, op string) *BitOp {
return &BitOp{BinaryExpression{Left: left, Right: right}, op}
}
// NewBitAnd creates a new BitOp & sql.Expression.
func NewBitAnd(left, right sql.Expression) *BitOp {
return NewBitOp(left, right, sqlparser.BitAndStr)
}
// NewBitOr creates a new BitOp | sql.Expression.
func NewBitOr(left, right sql.Expression) *BitOp {
return NewBitOp(left, right, sqlparser.BitOrStr)
}
// NewBitXor creates a new BitOp ^ sql.Expression.
func NewBitXor(left, right sql.Expression) *BitOp {
return NewBitOp(left, right, sqlparser.BitXorStr)
}
// NewShiftLeft creates a new BitOp << sql.Expression.
func NewShiftLeft(left, right sql.Expression) *BitOp {
return NewBitOp(left, right, sqlparser.ShiftLeftStr)
}
// NewShiftRight creates a new BitOp >> sql.Expression.
func NewShiftRight(left, right sql.Expression) *BitOp {
return NewBitOp(left, right, sqlparser.ShiftRightStr)
}
func (b *BitOp) String() string {
return fmt.Sprintf("(%s %s %s)", b.Left, b.Op, b.Right)
}
func (b *BitOp) DebugString() string {
return fmt.Sprintf("(%s %s %s)", sql.DebugString(b.Left), b.Op, sql.DebugString(b.Right))
}
// IsNullable implements the sql.Expression interface.
func (b *BitOp) IsNullable() bool {
return b.BinaryExpression.IsNullable()
}
// Type returns the greatest type for given operation.
func (b *BitOp) Type() sql.Type {
rTyp := b.Right.Type()
if types.IsDeferredType(rTyp) {
return rTyp
}
lTyp := b.Left.Type()
if types.IsDeferredType(lTyp) {
return lTyp
}
if types.IsText(lTyp) || types.IsText(rTyp) {
return types.Float64
}
if types.IsUnsigned(lTyp) && types.IsUnsigned(rTyp) {
return types.Uint64
} else if types.IsSigned(lTyp) && types.IsSigned(rTyp) {
return types.Int64
}
return types.Float64
}
// WithChildren implements the Expression interface.
func (b *BitOp) WithChildren(children ...sql.Expression) (sql.Expression, error) {
if len(children) != 2 {
return nil, sql.ErrInvalidChildrenNumber.New(b, len(children), 2)
}
return NewBitOp(children[0], children[1], b.Op), nil
}
// Eval implements the Expression interface.
func (b *BitOp) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
lval, rval, err := b.evalLeftRight(ctx, row)
if err != nil {
return nil, err
}
if lval == nil || rval == nil {
return nil, nil
}
lval, rval, err = b.convertLeftRight(ctx, lval, rval)
if err != nil {
return nil, err
}
switch strings.ToLower(b.Op) {
case sqlparser.BitAndStr:
return bitAnd(lval, rval)
case sqlparser.BitOrStr:
return bitOr(lval, rval)
case sqlparser.BitXorStr:
return bitXor(lval, rval)
case sqlparser.ShiftLeftStr:
return shiftLeft(lval, rval)
case sqlparser.ShiftRightStr:
return shiftRight(lval, rval)
}
return nil, errUnableToEval.New(lval, b.Op, rval)
}
func (b *BitOp) evalLeftRight(ctx *sql.Context, row sql.Row) (interface{}, interface{}, error) {
var lval, rval interface{}
var err error
// bit ops used with Interval error is caught at parsing the query
lval, err = b.Left.Eval(ctx, row)
if err != nil {
return nil, nil, err
}
rval, err = b.Right.Eval(ctx, row)
if err != nil {
return nil, nil, err
}
return lval, rval, nil
}
func (b *BitOp) convertLeftRight(ctx *sql.Context, left interface{}, right interface{}) (interface{}, interface{}, error) {
typ := b.Type()
left = convertValueToType(ctx, typ, left, types.IsTime(b.Left.Type()))
right = convertValueToType(ctx, typ, right, types.IsTime(b.Right.Type()))
return left, right, nil
}
// convertUintFromInt returns any int64 value converted to uint64 value
// including negative numbers. Mysql does not return negative result on
// bit arithmetic operations, so all results are returned in uint64 type.
func convertUintFromInt(n int64) uint64 {
intStr := strconv.FormatUint(*(*uint64)(unsafe.Pointer(&n)), 2)
uintVal, err := strconv.ParseUint(intStr, 2, 64)
if err != nil {
return 0
}
return uintVal
}
func bitAnd(lval, rval interface{}) (interface{}, error) {
if lval == nil || rval == nil {
return 0, nil
}
switch l := lval.(type) {
case float64:
switch r := rval.(type) {
case float64:
left := convertUintFromInt(int64(math.Round(l)))
right := convertUintFromInt(int64(math.Round(r)))
return left & right, nil
}
case uint64:
switch r := rval.(type) {
case uint64:
return l & r, nil
}
case int64:
switch r := rval.(type) {
case int64:
left := convertUintFromInt(l)
right := convertUintFromInt(r)
return left & right, nil
}
}
return nil, errUnableToCast.New(lval, rval)
}
func bitOr(lval, rval interface{}) (interface{}, error) {
if lval == nil && rval == nil {
return 0, nil
} else if lval == nil {
switch r := rval.(type) {
case float64:
return convertUintFromInt(int64(math.Round(r))), nil
case int64:
return convertUintFromInt(int64(math.Round(float64(r)))), nil
case uint64:
return r, nil
}
} else if rval == nil {
switch l := lval.(type) {
case float64:
return convertUintFromInt(int64(math.Round(l))), nil
case int64:
return convertUintFromInt(int64(math.Round(float64(l)))), nil
case uint64:
return l, nil
}
}
switch l := lval.(type) {
case float64:
switch r := rval.(type) {
case float64:
left := convertUintFromInt(int64(math.Round(l)))
right := convertUintFromInt(int64(math.Round(r)))
return left | right, nil
}
case uint64:
switch r := rval.(type) {
case uint64:
return l | r, nil
}
case int64:
switch r := rval.(type) {
case int64:
left := convertUintFromInt(l)
right := convertUintFromInt(r)
return left | right, nil
}
}
return nil, errUnableToCast.New(lval, rval)
}
func bitXor(lval, rval interface{}) (interface{}, error) {
if lval == nil && rval == nil {
return 0, nil
} else if lval == nil {
switch r := rval.(type) {
case float64:
return convertUintFromInt(int64(math.Round(r))), nil
case int64:
return convertUintFromInt(int64(math.Round(float64(r)))), nil
case uint64:
return r, nil
}
} else if rval == nil {
switch l := lval.(type) {
case float64:
return convertUintFromInt(int64(math.Round(l))), nil
case int64:
return convertUintFromInt(int64(math.Round(float64(l)))), nil
case uint64:
return l, nil
}
}
switch l := lval.(type) {
case float64:
switch r := rval.(type) {
case float64:
left := convertUintFromInt(int64(math.Round(l)))
right := convertUintFromInt(int64(math.Round(r)))
return left ^ right, nil
}
case uint64:
switch r := rval.(type) {
case uint64:
return l ^ r, nil
}
case int64:
switch r := rval.(type) {
case int64:
left := convertUintFromInt(l)
right := convertUintFromInt(r)
return left ^ right, nil
}
}
return nil, errUnableToCast.New(lval, rval)
}
func shiftLeft(lval, rval interface{}) (interface{}, error) {
if lval == nil {
return 0, nil
}
if rval == nil {
switch l := lval.(type) {
case float64:
return convertUintFromInt(int64(math.Round(l))), nil
case int64:
return convertUintFromInt(int64(math.Round(float64(l)))), nil
case uint64:
return l, nil
}
}
switch l := lval.(type) {
case float64:
switch r := rval.(type) {
case float64:
left := convertUintFromInt(int64(math.Round(l)))
right := convertUintFromInt(int64(math.Round(r)))
return left << right, nil
}
case uint64:
switch r := rval.(type) {
case uint64:
return l << r, nil
}
case int64:
switch r := rval.(type) {
case int64:
left := convertUintFromInt(l)
right := convertUintFromInt(r)
return left << right, nil
}
}
return nil, errUnableToCast.New(lval, rval)
}
func shiftRight(lval, rval interface{}) (interface{}, error) {
if lval == nil {
return 0, nil
}
if rval == nil {
switch l := lval.(type) {
case float64:
return convertUintFromInt(int64(math.Round(l))), nil
case int64:
return convertUintFromInt(int64(math.Round(float64(l)))), nil
case uint64:
return l, nil
}
}
switch l := lval.(type) {
case float64:
switch r := rval.(type) {
case float64:
left := convertUintFromInt(int64(math.Round(l)))
right := convertUintFromInt(int64(math.Round(r)))
return left >> right, nil
}
case uint64:
switch r := rval.(type) {
case uint64:
return l >> r, nil
}
case int64:
switch r := rval.(type) {
case int64:
left := convertUintFromInt(l)
right := convertUintFromInt(r)
return left >> right, nil
}
}
return nil, errUnableToCast.New(lval, rval)
}