wehub-resource-sync
72 lines
2.7 KiB
Go
72 lines
2.7 KiB
Go
// Copyright 2024 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 framework
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import (
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"github.com/dolthub/go-mysql-server/sql"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// compiledCatalog contains all of PostgreSQL functions in their compiled forms.
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var compiledCatalog = map[string]sql.CreateFuncNArgs{}
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// GetFunction returns the compiled function with the given name and parameters. Returns false if the function could not
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// be found.
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func GetFunction(ctx *sql.Context, functionName string, params ...sql.Expression) (*CompiledFunction, bool, error) {
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if createFunc, ok := compiledCatalog[functionName]; ok {
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expr, err := createFunc(ctx, params...)
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if err != nil {
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return nil, false, err
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}
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return expr.(*CompiledFunction), true, nil
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}
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return nil, false, nil
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}
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// dummyExpression is a simple expression that exists solely to capture type information for a parameter. This is used
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// exclusively by the getQuickFunctionForTypes function.
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type dummyExpression struct {
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t *pgtypes.DoltgresType
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}
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var _ sql.Expression = dummyExpression{}
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func (d dummyExpression) Resolved() bool { return true }
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func (d dummyExpression) String() string { return d.t.String() }
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func (d dummyExpression) Type(ctx *sql.Context) sql.Type { return d.t }
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func (d dummyExpression) IsNullable(ctx *sql.Context) bool { return false }
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func (d dummyExpression) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
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panic("cannot Eval dummyExpression")
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}
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func (d dummyExpression) Children() []sql.Expression { return nil }
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func (d dummyExpression) WithChildren(ctx *sql.Context, children ...sql.Expression) (sql.Expression, error) {
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return d, nil
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}
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// getQuickFunctionForTypes is used by the types package to load quick functions. This is declared here to work around
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// import cycles. Returns nil if a QuickFunction could not be constructed.
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func getQuickFunctionForTypes(ctx *sql.Context, functionName string, params []*pgtypes.DoltgresType) any {
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exprs := make([]sql.Expression, len(params))
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for i := range params {
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exprs[i] = dummyExpression{t: params[i]}
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}
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cf, ok, err := GetFunction(ctx, functionName, exprs...)
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if err != nil || !ok {
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return nil
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}
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return cf.GetQuickFunction()
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}
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