wehub-resource-sync
130 lines
3.6 KiB
Go
130 lines
3.6 KiB
Go
// Copyright 2024 Dolthub, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package pgcatalog
|
|
|
|
import (
|
|
"io"
|
|
|
|
"github.com/dolthub/go-mysql-server/sql"
|
|
|
|
"github.com/dolthub/doltgresql/core"
|
|
"github.com/dolthub/doltgresql/core/casts"
|
|
"github.com/dolthub/doltgresql/server/tables"
|
|
pgtypes "github.com/dolthub/doltgresql/server/types"
|
|
)
|
|
|
|
// PgCastName is a constant to the pg_cast name.
|
|
const PgCastName = "pg_cast"
|
|
|
|
// InitPgCast handles registration of the pg_cast handler.
|
|
func InitPgCast() {
|
|
tables.AddHandler(PgCatalogName, PgCastName, PgCastHandler{})
|
|
}
|
|
|
|
// PgCastHandler is the handler for the pg_cast table.
|
|
type PgCastHandler struct{}
|
|
|
|
var _ tables.Handler = PgCastHandler{}
|
|
|
|
// Name implements the interface tables.Handler.
|
|
func (p PgCastHandler) Name() string {
|
|
return PgCastName
|
|
}
|
|
|
|
// RowIter implements the interface tables.Handler.
|
|
func (p PgCastHandler) RowIter(ctx *sql.Context, partition sql.Partition) (sql.RowIter, error) {
|
|
castsColl, err := core.GetCastsCollectionFromContext(ctx, "")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
var allCasts []casts.Cast
|
|
err = castsColl.IterateCasts(ctx, func(c casts.Cast) (stop bool, err error) {
|
|
allCasts = append(allCasts, c)
|
|
return false, nil
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &pgCastRowIter{
|
|
allCasts: allCasts,
|
|
idx: 0,
|
|
}, nil
|
|
}
|
|
|
|
// PkSchema implements the interface tables.Handler.
|
|
func (p PgCastHandler) PkSchema() sql.PrimaryKeySchema {
|
|
return sql.PrimaryKeySchema{
|
|
Schema: pgCastSchema,
|
|
PkOrdinals: nil,
|
|
}
|
|
}
|
|
|
|
// pgCastSchema is the schema for pg_cast.
|
|
var pgCastSchema = sql.Schema{
|
|
{Name: "oid", Type: pgtypes.Oid, Default: nil, Nullable: false, Source: PgCastName},
|
|
{Name: "castsource", Type: pgtypes.Oid, Default: nil, Nullable: false, Source: PgCastName},
|
|
{Name: "casttarget", Type: pgtypes.Oid, Default: nil, Nullable: false, Source: PgCastName},
|
|
{Name: "castfunc", Type: pgtypes.Oid, Default: nil, Nullable: false, Source: PgCastName},
|
|
{Name: "castcontext", Type: pgtypes.InternalChar, Default: nil, Nullable: false, Source: PgCastName},
|
|
{Name: "castmethod", Type: pgtypes.InternalChar, Default: nil, Nullable: false, Source: PgCastName},
|
|
}
|
|
|
|
// pgCastRowIter is the sql.RowIter for the pg_cast table.
|
|
type pgCastRowIter struct {
|
|
allCasts []casts.Cast
|
|
idx int
|
|
}
|
|
|
|
var _ sql.RowIter = (*pgCastRowIter)(nil)
|
|
|
|
// Next implements the interface sql.RowIter.
|
|
func (iter *pgCastRowIter) Next(ctx *sql.Context) (sql.Row, error) {
|
|
if iter.idx >= len(iter.allCasts) {
|
|
return nil, io.EOF
|
|
}
|
|
cast := iter.allCasts[iter.idx]
|
|
iter.idx++
|
|
var castContext string
|
|
switch cast.CastType {
|
|
case casts.CastType_Explicit:
|
|
castContext = "e"
|
|
case casts.CastType_Assignment:
|
|
castContext = "a"
|
|
case casts.CastType_Implicit:
|
|
castContext = "i"
|
|
}
|
|
var castMethod string
|
|
if cast.Function.IsValid() || cast.BuiltIn != nil {
|
|
castMethod = "f"
|
|
} else if cast.UseInOut {
|
|
castMethod = "i"
|
|
} else {
|
|
castMethod = "b"
|
|
}
|
|
return sql.Row{
|
|
cast.ID.AsId(),
|
|
cast.ID.SourceType().AsId(),
|
|
cast.ID.TargetType().AsId(),
|
|
cast.Function.AsId(),
|
|
castContext,
|
|
castMethod,
|
|
}, nil
|
|
}
|
|
|
|
// Close implements the interface sql.RowIter.
|
|
func (iter *pgCastRowIter) Close(ctx *sql.Context) error {
|
|
return nil
|
|
}
|