Zach Musgrave
81 lines
2.7 KiB
Go
81 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 functions
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import (
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/doltgresql/core"
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"github.com/dolthub/doltgresql/core/id"
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"github.com/dolthub/doltgresql/server/functions/framework"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// initPgFunctionIsVisible registers the functions to the catalog.
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func initPgFunctionIsVisible() {
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framework.RegisterFunction(pg_function_is_visible_oid)
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}
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// pg_function_is_visible_oid represents the PostgreSQL system schema visibility inquiry function.
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var pg_function_is_visible_oid = framework.Function1{
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Name: "pg_function_is_visible",
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Return: pgtypes.Bool,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Oid},
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IsNonDeterministic: true,
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Strict: true,
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Callable: func(ctx *sql.Context, _ [2]*pgtypes.DoltgresType, val any) (any, error) {
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oidVal := val.(id.Id)
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if oidVal.Section() != id.Section_Function && oidVal.Section() != id.Section_Procedure {
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return false, nil
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}
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// TODO: Postgres additionally checks that the function isn't shadowed by one with the same
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// name and argument types in an earlier schema of the search path.
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paths, err := core.SearchPath(ctx)
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if err != nil {
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return false, err
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}
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// This is either id.Function or id.Procedure, so the first segment is the schema name
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schemaName := oidVal.Segment(0)
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inPath := false
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for _, path := range paths {
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if path == schemaName {
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inPath = true
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break
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}
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}
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if !inPath {
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return false, nil
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}
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// Built-in functions are registered in the OID cache at startup, and don't appear in the
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// function and procedure collections that RunCallback iterates over.
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if id.Cache().Exists(oidVal) {
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return true, nil
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}
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isVisible := false
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err = RunCallback(ctx, oidVal, Callbacks{
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Function: func(ctx *sql.Context, schema ItemSchema, function ItemFunction) (cont bool, err error) {
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isVisible = true
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return false, nil
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},
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Procedure: func(ctx *sql.Context, schema ItemSchema, procedure ItemProcedure) (cont bool, err error) {
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isVisible = true
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return false, nil
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},
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})
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return isVisible, err
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},
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}
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