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apply_update_accumulators.go
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apply_update_accumulators.go
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// Copyright 2020-2021 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 analyzer
import (
"fmt"
"github.com/gabereiser/go-mysql-server/sql/transform"
"github.com/gabereiser/go-mysql-server/sql"
"github.com/gabereiser/go-mysql-server/sql/plan"
)
// applyUpdateAccumulators wraps any Insert, Update, or Delete nodes with RowUpdateAccumulators to tally the results
// for report to the client.
func applyUpdateAccumulators(ctx *sql.Context, a *Analyzer, n sql.Node, scope *Scope, sel RuleSelector) (sql.Node, transform.TreeIdentity, error) {
switch n := n.(type) {
case *plan.TriggerExecutor, *plan.InsertInto, *plan.DeleteFrom, *plan.Update:
accumulatorType, err := getUpdateAccumulatorType(n)
if err != nil {
return nil, transform.SameTree, err
}
return plan.NewRowUpdateAccumulator(n, accumulatorType), transform.NewTree, nil
default:
return n, transform.SameTree, nil
}
}
// getUpdateAccumulatorType returns the type of accumulator needed for the node given, or an error if there's no match.
func getUpdateAccumulatorType(n sql.Node) (plan.RowUpdateType, error) {
switch n := n.(type) {
case *plan.TriggerExecutor:
return getUpdateAccumulatorType(n.Left())
case *plan.InsertInto:
if n.IsReplace {
return plan.UpdateTypeReplace, nil
} else if len(n.OnDupExprs) > 0 {
return plan.UpdateTypeDuplicateKeyUpdate, nil
}
return plan.UpdateTypeInsert, nil
case *plan.DeleteFrom:
return plan.UpdateTypeDelete, nil
case *plan.Update:
// search for a join
hasJoin := false
transform.Inspect(n, func(node sql.Node) bool {
switch node.(type) {
case *plan.JoinNode:
hasJoin = true
return false
}
return true
})
if hasJoin {
return plan.UpdateTypeJoinUpdate, nil
}
return plan.UpdateTypeUpdate, nil
}
return -1, fmt.Errorf("unexpected node type: %T", n)
}