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from.go
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from.go
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// Copyright 2023 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 ast
import (
"fmt"
vitess "github.com/dolthub/vitess/go/vt/sqlparser"
"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
)
// nodeFrom handles *tree.From nodes.
func nodeFrom(node tree.From) (vitess.TableExprs, error) {
if len(node.Tables) == 0 {
return nil, nil
}
asOfExpr, err := nodeExpr(node.AsOf.Expr)
if err != nil {
return nil, err
}
tableExprs, err := nodeTableExprs(node.Tables)
if err != nil {
return nil, err
}
if asOfExpr != nil {
//TODO: determine if this will always be Time
asOf := &vitess.AsOf{
Time: asOfExpr,
}
for _, tableExpr := range tableExprs {
if aliasedTableExpr, ok := tableExpr.(*vitess.AliasedTableExpr); ok {
aliasedTableExpr.AsOf = asOf
} else {
return nil, fmt.Errorf("this particular usage of AS OF is not yet supported")
}
}
}
return tableExprs, err
}