fix: support enum columns for mysqlsh copy-instance utility (#350)

* test: add enum column to mysqlsh copy-instance test
* test: add UUID column
* test: uuid and enum
* fix: convert enum ordinal to string for duckdb insert

Author: fanyang01

.github/workflows/mysql-copy-tests.yml

@@ -46,17 +46,22 @@ jobs:
 
       - name: Setup test data in source MySQL
         run: |
-          mysqlsh -hlocalhost -P13306 -uroot -proot --sql -e "
+          mysqlsh -hlocalhost -P13306 -uroot -proot --sql <<'EOF'
             CREATE DATABASE testdb;
             USE testdb;
+            -- Normal table, which should be copied to MyDuck via duckdb's csv import
             CREATE TABLE users (
               id INT AUTO_INCREMENT PRIMARY KEY,
-              name VARCHAR(100)
+              name VARCHAR(100),
+              status ENUM('active', 'inactive', 'pending') DEFAULT 'pending'
             );
-            INSERT INTO users (name) VALUES ('test1'), ('test2'), ('test3');
+            INSERT INTO users (name, status) VALUES
+              ('test1', 'active'),
+              ('test2', 'inactive'),
+              ('test3', 'pending');
             -- Make a gap in the id sequence
-            INSERT INTO users VALUES (100, 'test100');
-            INSERT INTO users (name) VALUES ('test101');
+            INSERT INTO users VALUES (100, 'test100', 'active');
+            INSERT INTO users (name, status) VALUES ('test101', 'inactive');
 
             -- A table with non-default starting auto_increment value
             CREATE TABLE items (
@@ -66,7 +71,22 @@ jobs:
             ) AUTO_INCREMENT=1000;
 
             INSERT INTO items (v, name) VALUES (1, 'item1'), (2, 'item2'), (3, 'item3');
-          "
+
+            -- Table with UUID primary key
+            -- For such tables, MySQL Shell generates nontrivial LOAD DATA statements
+            -- to copy the data to MyDuck: LOAD DATA ... (@id, title, created_at) SET id = FROM_BASE64(@id),
+            -- which can only be executed by the go-mysql-server framework for now.
+            CREATE TABLE documents (
+              id BINARY(16) PRIMARY KEY,
+              title VARCHAR(200),
+              status ENUM('draft', 'published', 'archived') DEFAULT 'draft',
+              created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+            );
+
+            INSERT INTO documents (id, title, status) VALUES
+              (UUID_TO_BIN(UUID()), 'Document 1', 'published'),
+              (UUID_TO_BIN(UUID()), 'Document 2', 'draft');
+          EOF
 
       - name: Build and start MyDuck Server
         run: |
@@ -85,7 +105,7 @@ jobs:
             --users false --ignore-version true
 
           # Verify the data was copied
-          for table in users items; do
+          for table in users items documents; do
             mysqlsh -hlocalhost -P13306 -uroot -proot --sql -e "
               SELECT * FROM testdb.$table ORDER BY id;
             " | tee source_data_$table.tsv
@@ -96,4 +116,4 @@ jobs:
             diff source_data_$table.tsv copied_data_$table.tsv
           done
 
-          
+

catalog/inserter.go

@@ -24,6 +24,7 @@ type rowInserter struct {
 	stmt     *stdsql.Stmt
 	err      error
 	flushSQL string
+	enums    []int
 }
 
 var _ sql.RowInserter = &rowInserter{}
@@ -75,9 +76,15 @@ func (ri *rowInserter) init(ctx *sql.Context) {
 	}
 	insert.WriteString(" INTO ")
 	insert.WriteString(ConnectIdentifiersANSI(ri.db, ri.table))
-	insert.WriteString(" SELECT * FROM ")
+	insert.WriteString(" FROM ")
 	insert.WriteString(QuoteIdentifierANSI(ri.tmpTable))
 	ri.flushSQL = insert.String()
+
+	for i, col := range ri.schema {
+		if _, ok := col.Type.(sql.EnumType); ok {
+			ri.enums = append(ri.enums, i)
+		}
+	}
 }
 
 func (ri *rowInserter) StatementBegin(ctx *sql.Context) {
@@ -106,6 +113,18 @@ func (ri *rowInserter) Insert(ctx *sql.Context, row sql.Row) error {
 	if ri.err != nil {
 		return ri.err
 	}
+
+	// For enum columns, we have to convert the enum ordinal to the enum string.
+	for _, i := range ri.enums {
+		if idx, ok := row[i].(uint16); ok {
+			if s, ok := ri.schema[i].Type.(sql.EnumType).At(int(idx)); ok {
+				row[i] = s
+			} else {
+				return fmt.Errorf("invalid enum value %d for column %s", idx, ri.schema[i].Name)
+			}
+		}
+	}
+
 	if _, err := ri.stmt.ExecContext(ctx, row...); err != nil {
 		ri.err = err
 		return err