wehub-resource-sync
125 lines
3.9 KiB
Go
125 lines
3.9 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/functions"
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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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// PgAttrdefName is a constant to the pg_attrdef name.
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const PgAttrdefName = "pg_attrdef"
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// InitPgAttrdef handles registration of the pg_attrdef handler.
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func InitPgAttrdef() {
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tables.AddHandler(PgCatalogName, PgAttrdefName, PgAttrdefHandler{})
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}
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// PgAttrdefHandler is the handler for the pg_attrdef table.
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type PgAttrdefHandler struct{}
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var _ tables.Handler = PgAttrdefHandler{}
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// Name implements the interface tables.Handler.
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func (p PgAttrdefHandler) Name() string {
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return PgAttrdefName
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}
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// RowIter implements the interface tables.Handler.
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func (p PgAttrdefHandler) RowIter(ctx *sql.Context, partition sql.Partition) (sql.RowIter, error) {
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// Use cached data from this process if it exists
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pgCatalogCache, err := getPgCatalogCache(ctx)
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if err != nil {
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return nil, err
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}
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if pgCatalogCache.attrdefCols == nil {
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var attrdefCols []functions.ItemColumnDefault
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var attrdefTableOIDs []id.Id
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err := functions.IterateCurrentDatabase(ctx, functions.Callbacks{
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ColumnDefault: func(ctx *sql.Context, _ functions.ItemSchema, table functions.ItemTable, col functions.ItemColumnDefault) (cont bool, err error) {
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attrdefCols = append(attrdefCols, col)
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attrdefTableOIDs = append(attrdefTableOIDs, table.OID.AsId())
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return true, nil
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},
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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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pgCatalogCache.attrdefCols = attrdefCols
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pgCatalogCache.attrdefTableOIDs = attrdefTableOIDs
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}
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return &pgAttrdefRowIter{
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cols: pgCatalogCache.attrdefCols,
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tableOIDs: pgCatalogCache.attrdefTableOIDs,
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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 PgAttrdefHandler) PkSchema() sql.PrimaryKeySchema {
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return sql.PrimaryKeySchema{
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Schema: pgAttrdefSchema,
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PkOrdinals: nil,
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}
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}
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// pgAttrdefSchema is the schema for pg_attrdef.
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var pgAttrdefSchema = sql.Schema{
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{Name: "oid", Type: pgtypes.Oid, Default: nil, Nullable: false, Source: PgAttributeName},
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{Name: "adrelid", Type: pgtypes.Oid, Default: nil, Nullable: false, Source: PgAttributeName},
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{Name: "adnum", Type: pgtypes.Int16, Default: nil, Nullable: false, Source: PgAttributeName},
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{Name: "adbin", Type: pgtypes.Text, Default: nil, Nullable: false, Source: PgAttributeName}, // TODO: collation C, type pg_node_tree
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}
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// pgAttrdefRowIter is the sql.RowIter for the pg_attrdef table.
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type pgAttrdefRowIter struct {
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cols []functions.ItemColumnDefault
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tableOIDs []id.Id
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idx int
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}
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var _ sql.RowIter = (*pgAttrdefRowIter)(nil)
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// Next implements the interface sql.RowIter.
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func (iter *pgAttrdefRowIter) Next(ctx *sql.Context) (sql.Row, error) {
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if iter.idx >= len(iter.cols) {
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return nil, io.EOF
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}
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iter.idx++
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col := iter.cols[iter.idx-1]
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tableOid := iter.tableOIDs[iter.idx-1]
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// TODO: Implement adbin when pg_node_tree exists
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return sql.Row{
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col.OID.AsId(), // oid
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tableOid, // adrelid
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int16(col.Item.ColumnIndex + 1), // adnum
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nil, // adbin
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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 *pgAttrdefRowIter) Close(ctx *sql.Context) error {
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return nil
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}
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