wehub-resource-sync
81 lines
2.0 KiB
Go
81 lines
2.0 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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"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
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vitess "github.com/dolthub/vitess/go/vt/sqlparser"
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)
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// nodeWith handles *tree.CTE nodes.
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func nodeCTE(ctx *Context, node *tree.CTE) (*vitess.CommonTableExpr, error) {
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if node == nil {
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return nil, nil
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}
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alias := vitess.NewTableIdent(string(node.Name.Alias))
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cols := make([]vitess.ColIdent, len(node.Name.Cols))
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for i, col := range node.Name.Cols {
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cols[i] = vitess.NewColIdent(string(col))
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}
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subSelect, ok := node.Stmt.(*tree.Select)
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if !ok {
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return nil, errors.Errorf("unsupported CTE statement type: %T", node.Stmt)
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}
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selectStmt, err := nodeSelect(ctx, subSelect)
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if err != nil {
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return nil, err
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}
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subQuery := &vitess.Subquery{
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Select: selectStmt,
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}
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return &vitess.CommonTableExpr{
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AliasedTableExpr: &vitess.AliasedTableExpr{
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Expr: subQuery,
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As: alias,
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Auth: vitess.AuthInformation{AuthType: vitess.AuthType_IGNORE},
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},
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Columns: cols,
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}, nil
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}
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// nodeWith handles *tree.With nodes.
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func nodeWith(ctx *Context, node *tree.With) (*vitess.With, error) {
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if node == nil {
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return nil, nil
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}
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ctes := make([]*vitess.CommonTableExpr, len(node.CTEList))
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for i, cte := range node.CTEList {
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var err error
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ctes[i], err = nodeCTE(ctx, cte)
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if err != nil {
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return nil, err
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}
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}
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return &vitess.With{
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Recursive: node.Recursive,
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Ctes: ctes,
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}, nil
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}
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