wehub-resource-sync
275 lines
8.2 KiB
Go
275 lines
8.2 KiB
Go
// 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 node
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import (
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"context"
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"fmt"
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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/plan"
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vitess "github.com/dolthub/vitess/go/vt/sqlparser"
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"github.com/dolthub/doltgresql/core"
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"github.com/dolthub/doltgresql/core/extensions"
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"github.com/dolthub/doltgresql/core/functions"
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"github.com/dolthub/doltgresql/core/id"
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"github.com/dolthub/doltgresql/core/procedures"
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"github.com/dolthub/doltgresql/server/plpgsql"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// RoutineParam represents a routine parameter with parameter name, type and default value if exists.
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type RoutineParam struct {
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Mode procedures.ParameterMode
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Name string
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Type *pgtypes.DoltgresType
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HasDefault bool
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Default sql.Expression
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}
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// CreateFunction implements CREATE FUNCTION.
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type CreateFunction struct {
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FunctionName string
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SchemaName string
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Replace bool
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ReturnType *pgtypes.DoltgresType
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Parameters []RoutineParam
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Strict bool
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Statements []plpgsql.InterpreterOperation
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ExtensionName string
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ExtensionSymbol string
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Definition string
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SqlDef string
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SqlDefParsedStmts []vitess.Statement
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SetOf bool
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}
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var _ sql.ExecSourceRel = (*CreateFunction)(nil)
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var _ vitess.Injectable = (*CreateFunction)(nil)
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// NewCreateFunction returns a new *CreateFunction.
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func NewCreateFunction(
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functionName string,
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schemaName string,
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replace bool,
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retType *pgtypes.DoltgresType,
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params []RoutineParam,
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strict bool,
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definition string,
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extensionName string,
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extensionSymbol string,
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statements []plpgsql.InterpreterOperation,
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sqlDef string,
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sqlDefParsedStmts []vitess.Statement,
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setOf bool) *CreateFunction {
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return &CreateFunction{
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FunctionName: functionName,
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SchemaName: schemaName,
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Replace: replace,
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ReturnType: retType,
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Parameters: params,
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Strict: strict,
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Statements: statements,
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ExtensionName: extensionName,
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ExtensionSymbol: extensionSymbol,
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Definition: definition,
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SqlDef: sqlDef,
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SqlDefParsedStmts: sqlDefParsedStmts,
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SetOf: setOf,
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}
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}
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// Children implements the interface sql.ExecSourceRel.
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func (c *CreateFunction) Children() []sql.Node {
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return nil
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}
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// IsReadOnly implements the interface sql.ExecSourceRel.
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func (c *CreateFunction) IsReadOnly() bool {
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return false
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}
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// Resolved implements the interface sql.ExecSourceRel.
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func (c *CreateFunction) Resolved() bool {
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return true
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}
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// RowIter implements the interface sql.ExecSourceRel.
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func (c *CreateFunction) RowIter(ctx *sql.Context, r sql.Row) (sql.RowIter, error) {
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funcCollection, err := core.GetFunctionsCollectionFromContext(ctx, "")
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if err != nil {
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return nil, err
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}
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paramNames := make([]string, len(c.Parameters))
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paramTypes := make([]id.Type, len(c.Parameters))
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paramDefaults := make([]string, len(c.Parameters))
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for i, param := range c.Parameters {
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paramNames[i] = param.Name
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paramTypes[i] = param.Type.ID
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if param.Default != nil {
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paramDefaults[i] = param.Default.String()
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}
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}
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schemaName, err := core.GetSchemaName(ctx, nil, c.SchemaName)
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if err != nil {
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return nil, err
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}
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funcID := id.NewFunction(schemaName, c.FunctionName, paramTypes...)
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if c.Replace && funcCollection.HasFunction(ctx, funcID) {
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if err = funcCollection.DropFunction(ctx, funcID); err != nil {
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return nil, err
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}
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}
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var extName string
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if len(c.ExtensionName) > 0 {
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ext, err := extensions.GetExtension(c.ExtensionName)
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if err != nil {
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return nil, err
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}
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ident := extensions.CreateLibraryIdentifier(c.ExtensionName, ext.Control.DefaultVersion)
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_, err = extensions.GetExtensionFunction(extensions.CreateLibraryIdentifier(c.ExtensionName, ext.Control.DefaultVersion), c.ExtensionSymbol)
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if err != nil {
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return nil, err
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}
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extName = string(ident)
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}
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err = funcCollection.AddFunction(ctx, functions.Function{
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ID: funcID,
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ReturnType: c.ReturnType.ID,
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ParameterNames: paramNames,
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ParameterTypes: paramTypes,
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ParameterDefaults: paramDefaults,
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Variadic: false, // TODO: implement this
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IsNonDeterministic: true,
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Strict: c.Strict,
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Definition: c.Definition,
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ExtensionName: extName,
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ExtensionSymbol: c.ExtensionSymbol,
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Operations: c.Statements,
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SQLDefinition: c.SqlDef,
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SetOf: c.SetOf,
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})
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if err != nil {
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return nil, err
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}
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return sql.RowsToRowIter(), nil
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}
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// Schema implements the interface sql.ExecSourceRel.
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func (c *CreateFunction) Schema(ctx *sql.Context) sql.Schema {
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return nil
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}
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// String implements the interface sql.ExecSourceRel.
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func (c *CreateFunction) String() string {
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// TODO: fully implement this
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return "CREATE FUNCTION"
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}
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// WithChildren implements the interface sql.ExecSourceRel.
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func (c *CreateFunction) WithChildren(ctx *sql.Context, children ...sql.Node) (sql.Node, error) {
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return plan.NillaryWithChildren(c, children...)
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}
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// WithResolvedChildren implements the interface vitess.Injectable.
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func (c *CreateFunction) WithResolvedChildren(ctx context.Context, children []any) (any, error) {
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if len(children) > len(c.Parameters) {
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// the number of default values can be fewer but cannot be more.
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return nil, ErrVitessChildCount.New(len(c.Parameters), len(children))
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}
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newParams := make([]RoutineParam, len(c.Parameters))
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childIdx := 0
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for i, param := range c.Parameters {
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newParams[i] = param
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if c.Parameters[i].HasDefault && childIdx < len(children) {
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expr, ok := children[childIdx].(sql.Expression)
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if !ok {
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return nil, errors.Errorf("invalid vitess child, expected sql.Expression for Default value but got %t", children[i])
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}
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newParams[i].Default = expr
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childIdx++
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}
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}
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ncf := *c
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ncf.Parameters = newParams
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return &ncf, nil
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}
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// FunctionColumn represents the deferred column used in functions.
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// It is a placeholder column reference later used for function calls.
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type FunctionColumn struct {
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Name string
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Typ *pgtypes.DoltgresType
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Idx uint16
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}
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var _ vitess.Injectable = (*FunctionColumn)(nil)
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var _ sql.Expression = (*FunctionColumn)(nil)
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// Resolved implements the interface sql.Expression.
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func (f *FunctionColumn) Resolved() bool {
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return !f.Typ.IsEmptyType()
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}
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// String implements the interface sql.Expression.
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func (f *FunctionColumn) String() string {
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if f.Name != "" {
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return fmt.Sprintf(`$%v`, f.Idx+1)
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}
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return f.Name
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}
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// Type implements the interface sql.Expression.
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func (f *FunctionColumn) Type(ctx *sql.Context) sql.Type {
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if f.Typ.IsEmptyType() {
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return pgtypes.Unknown
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}
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return f.Typ
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}
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// IsNullable implements the interface sql.Expression.
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func (f *FunctionColumn) IsNullable(ctx *sql.Context) bool {
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return false
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}
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// Eval implements the interface sql.Expression.
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func (f *FunctionColumn) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
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panic("FunctionColumn is a placeholder expression, but Eval() was called")
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}
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// Children implements the interface sql.Expression.
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func (f *FunctionColumn) Children() []sql.Expression {
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return nil
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}
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// WithChildren implements the interface sql.Expression.
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func (f *FunctionColumn) WithChildren(ctx *sql.Context, children ...sql.Expression) (sql.Expression, error) {
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if len(children) != 0 {
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return nil, sql.ErrInvalidChildrenNumber.New(f, len(children), 0)
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}
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return f, nil
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}
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// WithResolvedChildren implements the interface vitess.Injectable.
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func (f *FunctionColumn) WithResolvedChildren(ctx context.Context, children []any) (any, error) {
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if len(children) != 0 {
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return nil, errors.Errorf("invalid FunctionColumn child count, expected `0` but got `%d`", len(children))
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}
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return f, nil
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}
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