wehub-resource-sync
63 lines
1.8 KiB
Go
63 lines
1.8 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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vitess "github.com/dolthub/vitess/go/vt/sqlparser"
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"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
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"github.com/dolthub/doltgresql/utils"
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)
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// nodeSubquery handles *tree.Subquery nodes.
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func nodeSubquery(ctx *Context, node *tree.Subquery) (*vitess.Subquery, error) {
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if node == nil {
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return nil, nil
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}
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selectStmt, err := nodeSelectStatement(ctx, node.Select)
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if err != nil {
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return nil, err
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}
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return &vitess.Subquery{
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Select: selectStmt,
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}, nil
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}
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// nodeSubquery handles *tree.Subquery nodes, returning a vitess.TableExpr.
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func nodeSubqueryToTableExpr(ctx *Context, node *tree.Subquery) (vitess.TableExpr, error) {
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subquery, err := nodeSubquery(ctx, node)
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if err != nil {
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return nil, err
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}
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return &vitess.AliasedTableExpr{
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Expr: subquery,
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As: vitess.NewTableIdent(utils.GenerateUniqueAlias()),
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}, nil
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}
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// nodeSubqueryOrExists handles *tree.Subquery nodes that may be an EXISTS subquery, returning a vitess.Expr.
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func nodeSubqueryOrExists(ctx *Context, node *tree.Subquery) (vitess.Expr, error) {
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subquery, err := nodeSubquery(ctx, node)
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if err != nil {
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return nil, err
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}
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if !node.Exists {
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return subquery, nil
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}
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return &vitess.ExistsExpr{
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Subquery: subquery,
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}, nil
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}
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