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resolve_database.go
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resolve_database.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 (
"github.com/Rock-liyi/p2pdb-store/sql"
"github.com/Rock-liyi/p2pdb-store/sql/plan"
)
// resolveDatabase sets a database for nodes that implement sql.Databaser. Replaces sql.UnresolvedDatabase with the
// actual sql.Database implementation from the catalog.
func resolveDatabase(ctx *sql.Context, a *Analyzer, n sql.Node, scope *Scope) (sql.Node, error) {
span, _ := ctx.Span("resolve_database")
defer span.Finish()
return plan.TransformUp(n, func(n sql.Node) (sql.Node, error) {
d, ok := n.(sql.Databaser)
if !ok {
return n, nil
}
var dbName = ctx.GetCurrentDatabase()
if db := d.Database(); db != nil {
if _, ok := db.(sql.UnresolvedDatabase); !ok {
return n, nil
}
if db.Name() != "" {
dbName = db.Name()
}
}
// Nothing to resolve. This can happen if no database is current
if dbName == "" {
return n, nil
}
db, err := a.Catalog.Database(dbName)
if err != nil {
return nil, err
}
return d.WithDatabase(db)
})
}