curtisr7 commented on code in PR #246:
URL: https://github.com/apache/iceberg-go/pull/246#discussion_r1933057266


##########
catalog/sql/sql.go:
##########
@@ -0,0 +1,712 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you 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 sql
+
+import (
+       "context"
+       "database/sql"
+       "errors"
+       "fmt"
+       "maps"
+       "path"
+       "slices"
+       "strings"
+       "sync"
+       _ "unsafe"
+
+       "github.com/apache/iceberg-go"
+       "github.com/apache/iceberg-go/catalog"
+       "github.com/apache/iceberg-go/catalog/internal"
+       "github.com/apache/iceberg-go/io"
+       "github.com/apache/iceberg-go/table"
+       "github.com/uptrace/bun"
+       "github.com/uptrace/bun/dialect/feature"
+       "github.com/uptrace/bun/dialect/mssqldialect"
+       "github.com/uptrace/bun/dialect/mysqldialect"
+       "github.com/uptrace/bun/dialect/oracledialect"
+       "github.com/uptrace/bun/dialect/pgdialect"
+       "github.com/uptrace/bun/dialect/sqlitedialect"
+       "github.com/uptrace/bun/extra/bundebug"
+       "github.com/uptrace/bun/schema"
+)
+
+type SupportedDialect string
+
+const (
+       Postgres SupportedDialect = "postgres"
+       MySQL    SupportedDialect = "mysql"
+       SQLite   SupportedDialect = "sqlite"
+       MSSQL    SupportedDialect = "mssql"
+       Oracle   SupportedDialect = "oracle"
+)
+
+const (
+       DialectKey           = "sql.dialect"
+       DriverKey            = "sql.driver"
+       initCatalogTablesKey = "init_catalog_tables"
+)
+
+func init() {
+       catalog.Register("sql", catalog.RegistrarFunc(func(name string, p 
iceberg.Properties) (c catalog.Catalog, err error) {
+               driver, ok := p[DriverKey]
+               if !ok {
+                       return nil, errors.New("must provide driver to pass to 
sql.Open")
+               }
+
+               dialect := strings.ToLower(p[DialectKey])
+               if dialect == "" {
+                       return nil, errors.New("must provide sql dialect to 
use")
+               }
+
+               uri := strings.TrimPrefix(p.Get("uri", ""), "sql://")
+               sqldb, err := sql.Open(driver, uri)
+               if err != nil {
+                       return nil, err
+               }
+
+               defer func() {
+                       if r := recover(); r != nil {
+                               err = fmt.Errorf("failed to create SQL catalog: 
%v", r)
+                       }
+               }()
+
+               return NewCatalog(p.Get(name, "sql"), sqldb, 
SupportedDialect(dialect), p)
+       }))
+}
+
+var (
+       _ catalog.Catalog = (*Catalog)(nil)
+)
+
+var (
+       minimalNamespaceProps = iceberg.Properties{"exists": "true"}
+
+       dialects  = map[SupportedDialect]schema.Dialect{}
+       dialectMx sync.Mutex
+)
+
+func createDialect(d SupportedDialect) schema.Dialect {
+       switch d {
+       case Postgres:
+               return pgdialect.New()
+       case MySQL:
+               return mysqldialect.New()
+       case SQLite:
+               return sqlitedialect.New()
+       case MSSQL:
+               return mssqldialect.New()
+       case Oracle:
+               return oracledialect.New()
+       default:
+               panic("unsupported sql dialect")
+       }
+}
+
+func getDialect(d SupportedDialect) schema.Dialect {
+       dialectMx.Lock()
+       defer dialectMx.Unlock()
+       ret, ok := dialects[d]
+       if !ok {
+               ret = createDialect(d)
+               dialects[d] = ret
+       }
+       return ret
+}
+
+type sqlIcebergTable struct {
+       bun.BaseModel `bun:"table:iceberg_tables"`
+
+       CatalogName              string `bun:",pk"`
+       TableNamespace           string `bun:",pk"`
+       TableName                string `bun:",pk"`
+       MetadataLocation         sql.NullString
+       PreviousMetadataLocation sql.NullString
+}
+
+type sqlIcebergNamespaceProps struct {
+       bun.BaseModel `bun:"table:iceberg_namespace_properties"`
+
+       CatalogName   string `bun:",pk"`
+       Namespace     string `bun:",pk"`
+       PropertyKey   string `bun:",pk"`
+       PropertyValue sql.NullString
+}
+
+func withReadTx[R any](ctx context.Context, db *bun.DB, fn 
func(context.Context, bun.Tx) (R, error)) (result R, err error) {
+       db.RunInTx(ctx, &sql.TxOptions{ReadOnly: true}, func(ctx 
context.Context, tx bun.Tx) error {
+               result, err = fn(ctx, tx)
+               return err
+       })
+       return
+}
+
+func withWriteTx(ctx context.Context, db *bun.DB, fn func(context.Context, 
bun.Tx) error) error {
+       return db.RunInTx(ctx, &sql.TxOptions{Isolation: 
sql.LevelLinearizable}, func(ctx context.Context, tx bun.Tx) error {
+               return fn(ctx, tx)
+       })
+}
+
+type Catalog struct {
+       db    *bun.DB
+       name  string
+       props iceberg.Properties
+}
+
+// NewCatalog creates a new sql-based catalog using the provided sql.DB handle 
to perform any queries.
+//
+// The dialect parameter determines the SQL dialect to use for query 
generation and must be one of the
+// supported dialects, i.e. one of the exported SupportedDialect values. The 
separation here allows for
+// the use of different drivers/databases provided they support the chosen sql 
dialect (e.g. if a particular
+// database supports the MySQL dialect, then the database can still be used 
with this catalog even though
+// it's not explicitly implemented).
+//
+// If the "init_catalog_tables" property is set to "true", then creating the 
catalog will also attempt to
+// to verify whether the necessary tables (iceberg_tables and 
iceberg_namespace_properties) exist, creating
+// them if they do not already exist.
+//
+// The environment variable ICEBERG_SQL_DEBUG can be set to automatically log 
the sql queries to the terminal:
+// - ICEBERG_SQL_DEBUG=1 logs only failed queries
+// - ICEBERG_SQL_DEBUG=2 logs all queries
+//
+// All interactions with the db are performed within transactions to ensure 
atomicity and transactional isolation
+// of catalog changes.
+func NewCatalog(name string, db *sql.DB, dialect SupportedDialect, props 
iceberg.Properties) (*Catalog, error) {
+       cat := &Catalog{db: bun.NewDB(db, getDialect(dialect)), name: name, 
props: props}
+
+       cat.db.AddQueryHook(bundebug.NewQueryHook(
+               bundebug.WithEnabled(false),
+               // ICEBERG_SQL_DEBUG=1 logs only failed queries
+               // ICEBERG_SQL_DEBUG=2 log all queries
+               bundebug.FromEnv("ICEBERG_SQL_DEBUG")))
+
+       if cat.props.GetBool(initCatalogTablesKey, true) {
+               return cat, cat.ensureTablesExist()
+       }
+
+       return cat, nil
+}
+
+func (c *Catalog) Name() string { return c.name }
+
+func (c *Catalog) CatalogType() catalog.Type {
+       return catalog.SQL
+}
+
+func (c *Catalog) CreateSQLTables(ctx context.Context) error {
+       _, err := c.db.NewCreateTable().Model((*sqlIcebergTable)(nil)).
+               IfNotExists().Exec(ctx)
+       if err != nil {
+               return err
+       }
+
+       _, err = c.db.NewCreateTable().Model((*sqlIcebergNamespaceProps)(nil)).
+               IfNotExists().Exec(ctx)
+       return err
+}
+
+func (c *Catalog) DropSQLTables(ctx context.Context) error {
+       _, err := c.db.NewDropTable().Model((*sqlIcebergTable)(nil)).
+               IfExists().Exec(ctx)
+       if err != nil {
+               return err
+       }
+
+       _, err = c.db.NewDropTable().Model((*sqlIcebergNamespaceProps)(nil)).
+               IfExists().Exec(ctx)
+       return err
+}
+
+func (c *Catalog) ensureTablesExist() error {
+       return c.CreateSQLTables(context.Background())
+}
+
+func (c *Catalog) namespaceExists(ctx context.Context, ns string) (bool, 
error) {
+       return withReadTx(ctx, c.db, func(ctx context.Context, tx bun.Tx) 
(bool, error) {
+               exists, err := tx.NewSelect().Model((*sqlIcebergTable)(nil)).
+                       Where("catalog_name = ?", c.name).
+                       Where("table_namespace = ?", ns).
+                       Limit(1).Exists(ctx)
+               if err != nil {
+                       return false, err
+               }
+               if exists {
+                       return true, nil
+               }
+
+               return tx.NewSelect().Model((*sqlIcebergNamespaceProps)(nil)).
+                       Where("catalog_name = ?", c.name).Where("namespace = 
?", ns).
+                       Limit(1).Exists(ctx)
+       })
+}
+
+func (c *Catalog) getDefaultWarehouseLocation(ctx context.Context, nsname, 
tableName string) (string, error) {
+       dbprops, err := c.LoadNamespaceProperties(ctx, strings.Split(nsname, 
"."))
+       if err != nil {
+               return "", err
+       }
+
+       if dblocation := dbprops.Get("location", ""); dblocation != "" {
+               return path.Join(dblocation, tableName), nil
+       }
+
+       if warehousepath := c.props.Get("warehouse", ""); warehousepath != "" {
+               return warehousepath + "/" + path.Join(nsname+".db", 
tableName), nil
+       }
+
+       return "", errors.New("no default path set, please specify a location 
when creating a table")
+}
+
+func (c *Catalog) resolveTableLocation(ctx context.Context, loc, nsname, 
tablename string) (string, error) {
+       if len(loc) == 0 {
+               return c.getDefaultWarehouseLocation(ctx, nsname, tablename)
+       }
+
+       return strings.TrimSuffix(loc, "/"), nil
+}
+
+func checkValidNamespace(ident table.Identifier) error {
+       if len(ident) < 1 {
+               return fmt.Errorf("%w: empty namespace identifier", 
catalog.ErrNoSuchNamespace)
+       }
+       return nil
+}
+
+func (c *Catalog) CreateTable(ctx context.Context, ident table.Identifier, sc 
*iceberg.Schema, opts ...catalog.CreateTableOpt) (*table.Table, error) {
+       var cfg internal.CreateTableCfg
+       for _, opt := range opts {
+               opt(&cfg)
+       }
+
+       nsIdent := catalog.NamespaceFromIdent(ident)
+       tblIdent := catalog.TableNameFromIdent(ident)
+       ns := strings.Join(nsIdent, ".")
+       exists, err := c.namespaceExists(ctx, ns)
+       if err != nil {
+               return nil, err
+       }
+
+       if !exists {
+               return nil, fmt.Errorf("%w: %s", catalog.ErrNoSuchNamespace, ns)
+       }
+
+       loc, err := c.resolveTableLocation(ctx, cfg.Location, ns, tblIdent)
+       if err != nil {
+               return nil, err
+       }
+
+       metadataLocation := internal.GetMetadataLoc(loc, 0)
+       metadata, err := table.NewMetadata(sc, cfg.PartitionSpec, 
cfg.SortOrder, loc, cfg.Properties)
+       if err != nil {
+               return nil, err
+       }
+
+       if err := internal.WriteMetadata(metadata, metadataLocation, c.props); 
err != nil {
+               return nil, err
+       }
+
+       err = withWriteTx(ctx, c.db, func(ctx context.Context, tx bun.Tx) error 
{
+               _, err := tx.NewInsert().Model(&sqlIcebergTable{
+                       CatalogName:      c.name,
+                       TableNamespace:   ns,
+                       TableName:        tblIdent,
+                       MetadataLocation: sql.NullString{String: 
metadataLocation, Valid: true},
+               }).Exec(ctx)
+
+               if err != nil {
+                       return fmt.Errorf("failed to create table: %w", err)
+               }
+               return nil
+       })
+
+       if err != nil {
+               return nil, err
+       }
+
+       return c.LoadTable(ctx, ident, cfg.Properties)
+}
+
+func (c *Catalog) CommitTable(ctx context.Context, tbl *table.Table, reqs 
[]table.Requirement, updates []table.Update) (table.Metadata, string, error) {
+       panic("commit table not implemented for SQLCatalog")

Review Comment:
   > that's the pattern we've been doing so far
   
   +1 if that's the pattern you have been following



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