wehub-resource-sync
101 lines
2.8 KiB
Go
101 lines
2.8 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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"github.com/dolthub/go-mysql-server/sql/expression"
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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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pgexprs "github.com/dolthub/doltgresql/server/expression"
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)
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// nodeLimit handles *tree.Limit nodes.
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func nodeLimit(ctx *Context, node *tree.Limit) (*vitess.Limit, error) {
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if node == nil || ((node.Count == nil || node.Count == tree.NullLiteral{}) && (node.Offset == nil || node.Offset == tree.NullLiteral{})) {
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return nil, nil
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}
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var count vitess.Expr
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if !node.LimitAll {
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var err error
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count, err = nodeExpr(ctx, node.Count)
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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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offset, err := nodeExpr(ctx, node.Offset)
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if err != nil {
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return nil, err
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}
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// GMS is hardcoded to expect vitess.SQLVal for expressions such as `LIMIT 1 OFFSET 1`.
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// We need to remove the hard dependency, but for now, we'll just convert our literals to a vitess.SQLVal.
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if injectedExpr, ok := count.(vitess.InjectedExpr); ok {
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if literal, ok := injectedExpr.Expression.(*expression.Literal); ok {
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l := literal.Value()
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limitValue, err := int64ValueForLimit(l)
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if err != nil {
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return nil, err
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}
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if limitValue < 0 {
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return nil, errors.Errorf("LIMIT must be greater than or equal to 0")
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}
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count = pgexprs.ToVitessLiteral(literal)
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}
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}
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if injectedExpr, ok := offset.(vitess.InjectedExpr); ok {
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if literal, ok := injectedExpr.Expression.(*expression.Literal); ok {
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o := literal.Value()
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offsetVal, err := int64ValueForLimit(o)
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if err != nil {
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return nil, err
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}
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if offsetVal < 0 {
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return nil, errors.Errorf("OFFSET must be greater than or equal to 0")
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}
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offset = pgexprs.ToVitessLiteral(literal)
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}
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}
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return &vitess.Limit{
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Offset: offset,
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Rowcount: count,
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}, nil
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}
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// int64ValueForLimit converts a literal value to an int64
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func int64ValueForLimit(l any) (int64, error) {
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var limitValue int64
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switch l := l.(type) {
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case int:
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limitValue = int64(l)
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case int32:
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limitValue = int64(l)
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case int64:
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limitValue = l
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case float64:
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limitValue = int64(l)
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case float32:
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limitValue = int64(l)
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default:
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return 0, errors.Errorf("unsupported limit/offset value type %T", l)
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}
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return limitValue, nil
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}
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