wehub-resource-sync
70 lines
1.8 KiB
Go
70 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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"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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// nodeUnionClause handles tree.UnionClause nodes.
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func nodeUnionClause(ctx *Context, node *tree.UnionClause) (*vitess.SetOp, error) {
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if node == nil {
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return nil, nil
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}
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left, err := nodeSelect(ctx, node.Left)
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if err != nil {
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return nil, err
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}
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right, err := nodeSelect(ctx, node.Right)
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if err != nil {
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return nil, err
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}
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var unionType string
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switch node.Type {
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case tree.UnionOp:
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if node.All {
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unionType = vitess.UnionAllStr
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} else {
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unionType = vitess.UnionStr
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}
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case tree.IntersectOp:
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if node.All {
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unionType = vitess.IntersectAllStr
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} else {
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unionType = vitess.IntersectStr
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}
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case tree.ExceptOp:
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if node.All {
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unionType = vitess.ExceptAllStr
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} else {
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unionType = vitess.ExceptStr
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}
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default:
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return nil, errors.Errorf("unknown type of UNION operator: `%s`", node.Type.String())
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}
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// TODO next: the types here are incorrect for parenthetical table statements
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// Need to compare with the vitess result to see what the correct type is here
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return &vitess.SetOp{
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Type: unionType,
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Left: left,
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Right: right,
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}, nil
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}
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