wehub-resource-sync
141 lines
4.1 KiB
Go
141 lines
4.1 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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"fmt"
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"io"
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"strings"
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"github.com/dolthub/go-mysql-server/sql"
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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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// PgIndexesName is a constant to the pg_indexes name.
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const PgIndexesName = "pg_indexes"
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// InitPgIndexes handles registration of the pg_indexes handler.
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func InitPgIndexes() {
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tables.AddHandler(PgCatalogName, PgIndexesName, PgIndexesHandler{})
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}
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// PgIndexesHandler is the handler for the pg_indexes table.
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type PgIndexesHandler struct{}
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var _ tables.Handler = PgIndexesHandler{}
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// Name implements the interface tables.Handler.
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func (p PgIndexesHandler) Name() string {
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return PgIndexesName
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}
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// RowIter implements the interface tables.Handler.
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func (p PgIndexesHandler) 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.pgIndexes == nil {
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err = cachePgIndexes(ctx, pgCatalogCache)
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if err != nil {
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return nil, err
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}
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}
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return &pgIndexesRowIter{
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indexes: pgCatalogCache.pgIndexes,
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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 PgIndexesHandler) PkSchema() sql.PrimaryKeySchema {
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return sql.PrimaryKeySchema{
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Schema: pgIndexesSchema,
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PkOrdinals: nil,
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}
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}
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// pgIndexesSchema is the schema for pg_indexes.
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var pgIndexesSchema = sql.Schema{
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{Name: "schemaname", Type: pgtypes.Name, Default: nil, Nullable: true, Source: PgIndexesName},
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{Name: "tablename", Type: pgtypes.Name, Default: nil, Nullable: true, Source: PgIndexesName},
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{Name: "indexname", Type: pgtypes.Name, Default: nil, Nullable: true, Source: PgIndexesName},
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{Name: "tablespace", Type: pgtypes.Name, Default: nil, Nullable: true, Source: PgIndexesName},
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{Name: "indexdef", Type: pgtypes.Text, Default: nil, Nullable: true, Source: PgIndexesName},
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}
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// pgIndexesRowIter is the sql.RowIter for the pg_indexes table.
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type pgIndexesRowIter struct {
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indexes *pgIndexCache
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idx int
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}
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var _ sql.RowIter = (*pgIndexesRowIter)(nil)
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// Next implements the interface sql.RowIter.
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func (iter *pgIndexesRowIter) Next(ctx *sql.Context) (sql.Row, error) {
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if iter.idx >= len(iter.indexes.indexes) {
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return nil, io.EOF
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}
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iter.idx++
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index := iter.indexes.indexes[iter.idx-1]
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// TODO: Fill in the rest of the pg_indexes columns
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return sql.Row{
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index.schemaName, // schemaname
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iter.indexes.tableNames[index.tableOid], // tablename
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formatIndexName(index.index), // indexname
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"", // tablespace
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getIndexDef(index.index, index.schemaName), // indexdef
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}, nil
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}
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// formatIndexName returns the definition of the index.
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func getIndexDef(index sql.Index, schema string) string {
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name := formatIndexName(index)
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using := strings.ToLower(index.IndexType())
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unique := ""
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if index.IsUnique() {
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unique = " UNIQUE"
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}
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cols := make([]string, len(index.Expressions()))
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for i, expr := range index.Expressions() {
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split := strings.Split(expr, ".")
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if len(split) > 1 {
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cols[i] = split[1]
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} else {
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cols[i] = expr
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}
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}
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colsStr := strings.Join(cols, ", ")
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def := fmt.Sprintf("CREATE%s INDEX %s ON %s.%s USING %s (%s)", unique, name, schema, index.Table(), using, colsStr)
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if pi, ok := index.(sql.PartialIndex); ok && pi.Predicate() != "" {
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def += " WHERE (" + pi.Predicate() + ")"
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}
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return def
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}
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// Close implements the interface sql.RowIter.
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func (iter *pgIndexesRowIter) Close(ctx *sql.Context) error {
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return nil
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}
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