wehub-resource-sync
74 lines
1.9 KiB
Go
74 lines
1.9 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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"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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// nodeExplain handles *tree.Explain nodes.
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func nodeExplain(ctx *Context, node *tree.Explain) (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 node.TableName != nil {
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tableName, err := nodeUnresolvedObjectName(ctx, node.TableName)
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if err != nil {
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return nil, err
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}
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var showTableOpts *vitess.ShowTablesOpt
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if node.AsOf != nil {
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asOf, err := nodeExpr(ctx, node.AsOf.Expr)
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if err != nil {
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return nil, err
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}
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showTableOpts = &vitess.ShowTablesOpt{
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AsOf: asOf,
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SchemaName: tableName.SchemaQualifier.String(),
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DbName: tableName.DbQualifier.String(),
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}
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}
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show := &vitess.Show{
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Type: "columns",
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Table: tableName,
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ShowTablesOpt: showTableOpts,
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}
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return show, nil
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}
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if stmt, ok := node.Statement.(*tree.Select); ok {
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// TODO: read tree.ExplainOptions
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selectStmt, err := nodeSelect(ctx, stmt)
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if err != nil {
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return nil, err
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}
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explain := &vitess.Explain{
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ExplainFormat: vitess.TreeStr,
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Statement: selectStmt,
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}
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return explain, nil
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}
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return nil, errors.Errorf("This EXPLAIN syntax is not yet supported")
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}
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