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expr_literal.go
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expr_literal.go
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/*
Copyright 2023 The Vitess 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
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 evalengine
import (
"math"
"vitess.io/vitess/go/sqltypes"
querypb "vitess.io/vitess/go/vt/proto/query"
)
type (
Literal struct {
inner eval
}
)
var _ Expr = (*Literal)(nil)
// eval implements the Expr interface
func (l *Literal) eval(_ *ExpressionEnv) (eval, error) {
return l.inner, nil
}
// typeof implements the Expr interface
func (l *Literal) typeof(*ExpressionEnv, []*querypb.Field) (sqltypes.Type, typeFlag) {
var f typeFlag
switch e := l.inner.(type) {
case nil:
return sqltypes.Null, flagNull | flagNullable
case *evalBytes:
if e.isBitLiteral {
f |= flagBit
}
if e.isHexLiteral {
f |= flagHex
}
case *evalInt64:
if e.i == math.MinInt64 {
f |= flagIntegerUdf
}
if e == evalBoolTrue || e == evalBoolFalse {
f |= flagIsBoolean
}
case *evalUint64:
if e.hexLiteral {
f |= flagHex
}
if e.u == math.MaxInt64+1 {
f |= flagIntegerCap
}
if e.u > math.MaxInt64+1 {
f |= flagIntegerOvf
}
}
return l.inner.SQLType(), f
}
func (l *Literal) compile(c *compiler) (ctype, error) {
if l.inner == nil {
c.asm.PushNull()
} else if err := c.asm.PushLiteral(l.inner); err != nil {
return ctype{}, err
}
t, f := l.typeof(nil, nil)
return ctype{t, f, evalCollation(l.inner)}, nil
}