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show_var.go
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show_var.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"
"strings"
vitess "github.com/dolthub/vitess/go/vt/sqlparser"
"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
)
// nodeShowVar handles *tree.ShowVar nodes.
func nodeShowVar(node *tree.ShowVar) (vitess.Statement, error) {
if node == nil {
return nil, nil
}
if strings.ToLower(node.Name) == "is_superuser" {
return nil, fmt.Errorf("SHOW IS_SUPERUSER is not yet supported")
} else if strings.ToLower(node.Name) == "all" {
// TODO: need this soon
return nil, fmt.Errorf("SHOW ALL is not yet supported")
}
// TODO: this is a temporary way to get the param value for the current implementation
// need better way to get these info
s := &vitess.Select{
SelectExprs: vitess.SelectExprs{
&vitess.AliasedExpr{
Expr: &vitess.ColName{
Name: vitess.NewColIdent("@@session." + node.Name),
Qualifier: vitess.TableName{},
},
StartParsePos: 7,
EndParsePos: 17 + len(node.Name),
As: vitess.NewColIdent(node.Name),
},
},
}
return s, nil
}