wehub-resource-sync
115 lines
3.5 KiB
Go
115 lines
3.5 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 pgcatalog
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import (
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"io"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/doltgresql/core/id"
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"github.com/dolthub/doltgresql/server/tables"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// PgAmName is a constant to the pg_am name.
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const PgAmName = "pg_am"
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// InitPgAm handles registration of the pg_am handler.
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func InitPgAm() {
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tables.AddHandler(PgCatalogName, PgAmName, PgAmHandler{})
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}
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// PgAmHandler is the handler for the pg_am table.
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type PgAmHandler struct{}
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var _ tables.Handler = PgAmHandler{}
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// Name implements the interface tables.Handler.
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func (p PgAmHandler) Name() string {
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return PgAmName
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}
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// RowIter implements the interface tables.Handler.
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func (p PgAmHandler) RowIter(ctx *sql.Context, partition sql.Partition) (sql.RowIter, error) {
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return &pgAmRowIter{
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ams: defaultPostgresAms,
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idx: 0,
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}, nil
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}
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// PkSchema implements the interface tables.Handler.
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func (p PgAmHandler) PkSchema() sql.PrimaryKeySchema {
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return sql.PrimaryKeySchema{
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Schema: pgAmSchema,
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PkOrdinals: nil,
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}
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}
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// pgAmSchema is the schema for pg_am.
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var pgAmSchema = sql.Schema{
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{Name: "oid", Type: pgtypes.Oid, Default: nil, Nullable: false, Source: PgAmName},
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{Name: "amname", Type: pgtypes.Name, Default: nil, Nullable: false, Source: PgAmName},
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{Name: "amhandler", Type: pgtypes.Text, Default: nil, Nullable: false, Source: PgAmName}, // TODO: type regproc
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{Name: "amtype", Type: pgtypes.InternalChar, Default: nil, Nullable: false, Source: PgAmName},
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}
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// pgAmRowIter is the sql.RowIter for the pg_am table.
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type pgAmRowIter struct {
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ams []accessMethod
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idx int
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}
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var _ sql.RowIter = (*pgAmRowIter)(nil)
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// Next implements the interface sql.RowIter.
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func (iter *pgAmRowIter) Next(ctx *sql.Context) (sql.Row, error) {
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if iter.idx >= len(iter.ams) {
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return nil, io.EOF
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}
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iter.idx++
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am := iter.ams[iter.idx-1]
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return sql.Row{
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am.oid, // oid
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am.name, // amname
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am.handler, // amhandler
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am.typ, // amtype
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}, nil
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}
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// Close implements the interface sql.RowIter.
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func (iter *pgAmRowIter) Close(ctx *sql.Context) error {
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return nil
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}
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type accessMethod struct {
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oid id.Id
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name string
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handler string
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typ string
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}
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// defaultPostgresAms is the list of default access methods available in Postgres.
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var defaultPostgresAms = []accessMethod{
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{oid: id.NewAccessMethod("heap").AsId(), name: "heap", handler: "heap_tableam_handler", typ: "t"},
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{oid: id.NewAccessMethod("btree").AsId(), name: "btree", handler: "bthandler", typ: "i"},
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{oid: id.NewAccessMethod("hash").AsId(), name: "hash", handler: "hashhandler", typ: "i"},
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{oid: id.NewAccessMethod("gist").AsId(), name: "gist", handler: "gisthandler", typ: "i"},
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{oid: id.NewAccessMethod("gin").AsId(), name: "gin", handler: "ginhandler", typ: "i"},
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{oid: id.NewAccessMethod("spgist").AsId(), name: "spgist", handler: "spghandler", typ: "i"},
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{oid: id.NewAccessMethod("brin").AsId(), name: "brin", handler: "brinhandler", typ: "i"},
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}
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