wehub-resource-sync
80 lines
2.3 KiB
Go
80 lines
2.3 KiB
Go
// Copyright 2023 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ast
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import (
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"strings"
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"github.com/cockroachdb/errors"
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vitess "github.com/dolthub/vitess/go/vt/sqlparser"
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"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
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)
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// nodeShowVar handles *tree.ShowVar nodes.
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func nodeShowVar(ctx *Context, node *tree.ShowVar) (vitess.Statement, error) {
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if node == nil {
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return nil, nil
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}
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if strings.ToLower(node.Name) == "is_superuser" {
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return nil, errors.Errorf("SHOW IS_SUPERUSER is not yet supported")
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} else if strings.ToLower(node.Name) == "all" {
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// TODO: need this soon
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return nil, errors.Errorf("SHOW ALL is not yet supported")
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}
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// TODO: this is a temporary way to get the param value for the current implementation
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// need better way to get these info
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// We treat namespaced variables (e.g. myvar.myvalue) as user variables.
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// See set_var.go
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isUserVar := strings.Index(node.Name, ".") > 0
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if isUserVar {
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varName := vitess.NewColIdent(node.Name)
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return &vitess.Select{
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SelectExprs: vitess.SelectExprs{
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&vitess.AliasedExpr{
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Expr: &vitess.FuncExpr{
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Name: vitess.NewColIdent("current_setting"),
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Exprs: []vitess.SelectExpr{
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&vitess.AliasedExpr{
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Expr: &vitess.SQLVal{Type: vitess.StrVal, Val: []byte(node.Name)},
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},
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},
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},
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StartParsePos: 7,
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EndParsePos: 7 + len(varName.String()),
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As: varName,
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},
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},
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}, nil
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} else {
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varName := vitess.NewColIdent("@@session." + node.Name)
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return &vitess.Select{
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SelectExprs: vitess.SelectExprs{
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&vitess.AliasedExpr{
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Expr: &vitess.ColName{
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Name: varName,
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Qualifier: vitess.TableName{},
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},
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StartParsePos: 7,
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EndParsePos: 7 + len(varName.String()),
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As: varName,
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},
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},
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}, nil
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}
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}
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