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derived.go
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derived.go
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/*
Copyright 2021 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 abstract
import (
vtrpcpb "vitess.io/vitess/go/vt/proto/vtrpc"
"vitess.io/vitess/go/vt/sqlparser"
"vitess.io/vitess/go/vt/vterrors"
"vitess.io/vitess/go/vt/vtgate/semantics"
)
// Derived represents a derived table in the query
type Derived struct {
Sel sqlparser.SelectStatement
Inner Operator
Alias string
}
var _ Operator = (*Derived)(nil)
// TableID implements the Operator interface
func (d *Derived) TableID() semantics.TableSet {
return d.Inner.TableID()
}
// PushPredicate implements the Operator interface
func (d *Derived) PushPredicate(expr sqlparser.Expr, semTable *semantics.SemTable) error {
tableInfo, err := semTable.TableInfoForExpr(expr)
if err != nil {
if err == semantics.ErrMultipleTables {
return semantics.ProjError{Inner: vterrors.Errorf(vtrpcpb.Code_UNIMPLEMENTED, "unsupported: unable to split predicates to derived table: %s", sqlparser.String(expr))}
}
return err
}
newExpr, err := semantics.RewriteDerivedExpression(expr, tableInfo)
if err != nil {
return err
}
return d.Inner.PushPredicate(newExpr, semTable)
}
// UnsolvedPredicates implements the Operator interface
func (d *Derived) UnsolvedPredicates(semTable *semantics.SemTable) []sqlparser.Expr {
return d.Inner.UnsolvedPredicates(semTable)
}
// CheckValid implements the Operator interface
func (d *Derived) CheckValid() error {
return d.Inner.CheckValid()
}
// Compact implements the Operator interface
func (d *Derived) Compact(*semantics.SemTable) (Operator, error) {
return d, nil
}