wehub-resource-sync
86 lines
3.3 KiB
Go
Executable File
86 lines
3.3 KiB
Go
Executable File
// Copyright 2025 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 analyzer
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import (
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"strings"
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"github.com/cockroachdb/errors"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/go-mysql-server/sql/expression"
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"github.com/dolthub/doltgresql/core"
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"github.com/dolthub/doltgresql/core/casts"
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"github.com/dolthub/doltgresql/server/functions/framework"
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"github.com/dolthub/doltgresql/server/types"
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)
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// validateForeignKeyDefinition validates that the given foreign key definition is valid for creation
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func validateForeignKeyDefinition(ctx *sql.Context, fkDef sql.ForeignKeyConstraint, cols map[string]*sql.Column, parentCols map[string]*sql.Column) error {
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var castsColl *casts.Collection
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if len(fkDef.Columns) > 0 {
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var err error
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// TODO: which database is this supposed to use?
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castsColl, err = core.GetCastsCollectionFromContext(ctx, "")
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if err != nil {
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return err
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}
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}
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for i := range fkDef.Columns {
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col := cols[strings.ToLower(fkDef.Columns[i])]
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parentCol := parentCols[strings.ToLower(fkDef.ParentColumns[i])]
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if !foreignKeyComparableTypes(ctx, castsColl, col.Type, parentCol.Type) {
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return errors.Errorf("Key columns %q and %q are of incompatible types: %s and %s", col.Name, parentCol.Name, col.Type.String(), parentCol.Type.String())
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}
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}
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return nil
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}
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// foreignKeyComparableTypes returns whether the two given types are able to be used as parent/child columns in a
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// foreign key.
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func foreignKeyComparableTypes(ctx *sql.Context, castColl *casts.Collection, from sql.Type, to sql.Type) bool {
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dtFrom, ok := from.(*types.DoltgresType)
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if !ok {
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return false // should never be possible
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}
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dtTo, ok := to.(*types.DoltgresType)
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if !ok {
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return false // should never be possible
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}
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if dtFrom.Equals(dtTo) {
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return true
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}
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fromLiteral := expression.NewLiteral(dtFrom.Zero(), from)
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toLiteral := expression.NewLiteral(dtTo.Zero(), to)
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// a foreign key between two different types is valid if there is an equality operator on the two types
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// TODO: there are some subtleties in postgres not captured by this logic, e.g. a foreign key from double -> int
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// is valid, but the reverse is not. This works fine, but is more permissive than postgres is.
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eq := framework.GetBinaryFunction(framework.Operator_BinaryEqual).Compile(ctx, "=", fromLiteral, toLiteral)
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if eq == nil || eq.StashedError() != nil {
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return false
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}
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// Additionally, we need to be able to convert freely between the two types in both directions, since we do this
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// during the process of enforcing the constraints
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forwardConversion, fErr := castColl.GetAssignmentCast(ctx, dtFrom, dtTo)
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reverseConversion, rErr := castColl.GetAssignmentCast(ctx, dtTo, dtFrom)
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return fErr == nil && rErr == nil && forwardConversion.ID.IsValid() && reverseConversion.ID.IsValid()
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}
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