logical type alias and cleanup

api/pkgs/@duckdb/node-api/README.md

@@ -18,7 +18,6 @@ This is a high-level API meant for applications. It depends on low-level binding
 Some features are not yet complete:
 - Friendlier APIs for convering results to common JS data structures.
 - Friendlier APIs for converting values of specialized and complex DuckDB types to common JS types.
-- Automatic memory management (i.e. avoiding the need to call `dispose` manually in most cases).
 - Appending and binding advanced data types. (Additional DuckDB C API support needed.)
 - Writing to data chunk vectors. (Directly writing to binary buffers is challenging to support using the Node Addon API.)
 - User-defined types & functions. (Support for this was added to the DuckDB C API in v1.1.0.)
@@ -70,33 +69,18 @@ Set configuration options:
 const instance = await DuckDBInstance.create('my_duckdb.db', { threads: '4' });
 ```
 
-Dispose:
-```ts
-await instance.dispose();
-```
-
 ### Connect
 
 ```ts
 const connection = await instance.connect();
 ```
 
-Dispose:
-```ts
-await connection.dispose();
-```
-
 ### Run SQL
 
 ```ts
 const result = await connection.run('from test_all_types()');
 ```
 
-Dispose:
-```ts
-result.dispose();
-```
-
 ### Parameterize SQL
 
 ```ts
@@ -106,12 +90,6 @@ prepared.bindInteger(2, 42);
 const result = await prepared.run();
 ```
 
-Dispose:
-```ts
-result.dispose();
-prepared.dispose();
-```
-
 ### Inspect Result
 
 Get column names and types:
@@ -155,11 +133,6 @@ for (let columnIndex = 0; columnIndex < columnCount; columnIndex++) {
 }
 ```
 
-Dispose data chunk:
-```ts
-chunk.dispose();
-```
-
 ### Inspect Data Types
 
 ```ts
@@ -197,6 +170,11 @@ if (columnType.typeId === DuckDBTypeId.UNION) {
   const unionMemberTags = columnType.memberTags;
   const unionMemberTypes = columnType.memberTypes;
 }
+
+// For the JSON type (https://duckdb.org/docs/data/json/json_type)
+if (columnType.alias === 'JSON') {
+  const json = JSON.parse(columnValue);
+}
 ```
 
 Every type implements toString, matching DuckDB's type-to-string conversion.
@@ -313,25 +291,25 @@ if (columnType.typeId === DuckDBTypeId.UUID) {
 ### Append To Table
 
 ```ts
-const createTableResult = await connection.run(`create or replace table target_table(i integer, v varchar)`);
-createTableResult.dispose();
+await connection.run(`create or replace table target_table(i integer, v varchar)`);
 
 const appender = await connection.createAppender('main', 'target_table');
-try {
-  appender.appendInteger(42);
-  appender.appendVarchar('duck');
-  appender.endRow();
-  appender.appendInteger(123);
-  appender.appendVarchar('mallard');
-  appender.endRow();
-  appender.flush();
-  appender.appendInteger(17);
-  appender.appendVarchar('goose');
-  appender.endRow();
-  appender.close(); // also flushes
-} finally {
-  appender.dispose();
-}
+
+appender.appendInteger(42);
+appender.appendVarchar('duck');
+appender.endRow();
+
+appender.appendInteger(123);
+appender.appendVarchar('mallard');
+appender.endRow();
+
+appender.flush();
+
+appender.appendInteger(17);
+appender.appendVarchar('goose');
+appender.endRow();
+
+appender.close(); // also flushes
 ```
 
 ### Extract Statements
@@ -343,24 +321,15 @@ const extractedStatements = await connection.extractStatements(`
   drop table numbers;
 `);
 const parameterValues = [10, 7];
-try {
-  const statementCount = extractedStatements.count;
-  for (let statementIndex = 0; statementIndex < statementCount; statementIndex++) {
-    const prepared = await extractedStatements.prepare(statementIndex);
-    try {
-      let parameterCount = prepared.parameterCount;
-      for (let parameterIndex = 1; parameterIndex <= parameterCount; parameterIndex++) {
-        prepared.bindInteger(parameterIndex, parameterValues.shift());
-      }
-      const result = await prepared.run();
-      // ...
-      result.dispose();
-    } finally {
-      prepared.dispose();
-    }
+const statementCount = extractedStatements.count;
+for (let statementIndex = 0; statementIndex < statementCount; statementIndex++) {
+  const prepared = await extractedStatements.prepare(statementIndex);
+  let parameterCount = prepared.parameterCount;
+  for (let parameterIndex = 1; parameterIndex <= parameterCount; parameterIndex++) {
+    prepared.bindInteger(parameterIndex, parameterValues.shift());
   }
-} finally {
-  extractedStatements.dispose();
+  const result = await prepared.run();
+  // ...
 }
 ```
 
@@ -376,21 +345,12 @@ async function sleep(ms) {
 }
 
 const prepared = await connection.prepare('from range(10_000_000)');
-try {
-  const pending = prepared.start();
-  try {
-    while (pending.runTask() !== DuckDBPendingResultState.RESULT_READY) {
-      console.log('not ready');
-      await sleep(1);
-    }
-    console.log('ready');
-    const result = await pending.getResult();
-    // ...
-    result.dispose();
-  } finally {
-    pending.dispose();
-  }
-} finally {
-  prepared.dispose();
-}
+const pending = prepared.start();
+while (pending.runTask() !== DuckDBPendingResultState.RESULT_READY) {
+  console.log('not ready');
+  await sleep(1);
+}
+console.log('ready');
+const result = await pending.getResult();
+// ...
 ```

api/src/DuckDBAppender.ts

@@ -24,7 +24,9 @@ export class DuckDBAppender {
     return duckdb.appender_column_count(this.appender);
   }
   public columnType(columnIndex: number): DuckDBType {
-    return DuckDBLogicalType.consumeAsType(duckdb.appender_column_type(this.appender, columnIndex));
+    return DuckDBLogicalType.create(
+      duckdb.appender_column_type(this.appender, columnIndex)
+    ).asType();
   }
   public endRow() {
     duckdb.appender_end_row(this.appender);

api/src/DuckDBLogicalType.ts

@@ -45,11 +45,6 @@ export class DuckDBLogicalType {
   protected constructor(logical_type: duckdb.LogicalType) {
     this.logical_type = logical_type;
   }
-  static consumeAsType(logical_type: duckdb.LogicalType): DuckDBType {
-    const logicalType = DuckDBLogicalType.create(logical_type);
-    const type = logicalType.asType();
-    return type;
-  }
   static create(logical_type: duckdb.LogicalType): DuckDBLogicalType {
     switch (duckdb.get_type_id(logical_type)) {
       case duckdb.Type.DECIMAL:
@@ -147,60 +142,61 @@ export class DuckDBLogicalType {
   public get typeId(): DuckDBTypeId {
     return duckdb.get_type_id(this.logical_type) as number as DuckDBTypeId;
   }
-  public get alias(): string | null {
-    return duckdb.logical_type_get_alias(this.logical_type);
+  public get alias(): string | undefined {
+    return duckdb.logical_type_get_alias(this.logical_type) || undefined;
   }
   public set alias(newAlias: string) {
     duckdb.logical_type_set_alias(this.logical_type, newAlias);
   }
   public asType(): DuckDBType {
+    const alias = this.alias;
     switch (this.typeId) {
       case DuckDBTypeId.BOOLEAN:
-        return DuckDBBooleanType.instance;
+        return  DuckDBBooleanType.create(alias);
       case DuckDBTypeId.TINYINT:
-        return DuckDBTinyIntType.instance;
+        return DuckDBTinyIntType.create(alias);
       case DuckDBTypeId.SMALLINT:
-        return DuckDBSmallIntType.instance;
+        return DuckDBSmallIntType.create(alias);
       case DuckDBTypeId.INTEGER:
-        return DuckDBIntegerType.instance;
+        return DuckDBIntegerType.create(alias);
       case DuckDBTypeId.BIGINT:
-        return DuckDBBigIntType.instance;
+        return DuckDBBigIntType.create(alias);
       case DuckDBTypeId.UTINYINT:
-        return DuckDBUTinyIntType.instance;
+        return DuckDBUTinyIntType.create(alias);
       case DuckDBTypeId.USMALLINT:
-        return DuckDBUSmallIntType.instance;
+        return DuckDBUSmallIntType.create(alias);
       case DuckDBTypeId.UINTEGER:
-        return DuckDBUIntegerType.instance;
+        return DuckDBUIntegerType.create(alias);
       case DuckDBTypeId.UBIGINT:
-        return DuckDBUBigIntType.instance;
+        return DuckDBUBigIntType.create(alias);
       case DuckDBTypeId.FLOAT:
-        return DuckDBFloatType.instance;
+        return DuckDBFloatType.create(alias);
       case DuckDBTypeId.DOUBLE:
-        return DuckDBDoubleType.instance;
+        return DuckDBDoubleType.create(alias);
       case DuckDBTypeId.TIMESTAMP:
-        return DuckDBTimestampType.instance;
+        return DuckDBTimestampType.create(alias);
       case DuckDBTypeId.DATE:
-        return DuckDBDateType.instance;
+        return DuckDBDateType.create(alias);
       case DuckDBTypeId.TIME:
-        return DuckDBTimeType.instance;
+        return DuckDBTimeType.create(alias);
       case DuckDBTypeId.INTERVAL:
-        return DuckDBIntervalType.instance;
+        return DuckDBIntervalType.create(alias);
       case DuckDBTypeId.HUGEINT:
-        return DuckDBHugeIntType.instance;
+        return DuckDBHugeIntType.create(alias);
       case DuckDBTypeId.UHUGEINT:
-        return DuckDBUHugeIntType.instance;
+        return DuckDBUHugeIntType.create(alias);
       case DuckDBTypeId.VARCHAR:
-        return DuckDBVarCharType.instance;
+        return DuckDBVarCharType.create(alias);
       case DuckDBTypeId.BLOB:
-        return DuckDBBlobType.instance;
+        return DuckDBBlobType.create(alias);
       case DuckDBTypeId.DECIMAL:
         throw new Error('Expected override');
       case DuckDBTypeId.TIMESTAMP_S:
-        return DuckDBTimestampSecondsType.instance;
+        return DuckDBTimestampSecondsType.create(alias);
       case DuckDBTypeId.TIMESTAMP_MS:
-        return DuckDBTimestampMillisecondsType.instance;
+        return DuckDBTimestampMillisecondsType.create(alias);
       case DuckDBTypeId.TIMESTAMP_NS:
-        return DuckDBTimestampNanosecondsType.instance;
+        return DuckDBTimestampNanosecondsType.create(alias);
       case DuckDBTypeId.ENUM:
         throw new Error('Expected override');
       case DuckDBTypeId.LIST:
@@ -212,21 +208,21 @@ export class DuckDBLogicalType {
       case DuckDBTypeId.ARRAY:
         throw new Error('Expected override');
       case DuckDBTypeId.UUID:
-        return DuckDBUUIDType.instance;
+        return DuckDBUUIDType.create(alias);
       case DuckDBTypeId.UNION:
         throw new Error('Expected override');
       case DuckDBTypeId.BIT:
-        return DuckDBBitType.instance;
+        return DuckDBBitType.create(alias);
       case DuckDBTypeId.TIME_TZ:
-        return DuckDBTimeTZType.instance;
+        return DuckDBTimeTZType.create(alias);
       case DuckDBTypeId.TIMESTAMP_TZ:
-        return DuckDBTimestampTZType.instance;
+        return DuckDBTimestampTZType.create(alias);
       case DuckDBTypeId.ANY:
-        return DuckDBAnyType.instance;
+        return DuckDBAnyType.create(alias);
       case DuckDBTypeId.VARINT:
-        return DuckDBVarIntType.instance;
+        return DuckDBVarIntType.create(alias);
       case DuckDBTypeId.SQLNULL:
-        return DuckDBSQLNullType.instance;
+        return DuckDBSQLNullType.create(alias);
       default:
         throw new Error(`Unexpected type id: ${this.typeId}`);
     }
@@ -246,7 +242,7 @@ export class DuckDBDecimalLogicalType extends DuckDBLogicalType {
     ) as number as DuckDBTypeId;
   }
   public override asType(): DuckDBDecimalType {
-    return new DuckDBDecimalType(this.width, this.scale);
+    return new DuckDBDecimalType(this.width, this.scale, this.alias);
   }
 }
 
@@ -271,7 +267,7 @@ export class DuckDBEnumLogicalType extends DuckDBLogicalType {
     ) as number as DuckDBTypeId;
   }
   public override asType(): DuckDBEnumType {
-    return new DuckDBEnumType(this.values(), this.internalTypeId);
+    return new DuckDBEnumType(this.values(), this.internalTypeId, this.alias);
   }
 }
 
@@ -282,7 +278,7 @@ export class DuckDBListLogicalType extends DuckDBLogicalType {
     );
   }
   public override asType(): DuckDBListType {
-    return new DuckDBListType(this.valueType.asType());
+    return new DuckDBListType(this.valueType.asType(), this.alias);
   }
 }
 
@@ -326,7 +322,7 @@ export class DuckDBStructLogicalType extends DuckDBLogicalType {
     return valueTypes;
   }
   public override asType(): DuckDBStructType {
-    return new DuckDBStructType(this.entryNames(), this.entryTypes());
+    return new DuckDBStructType(this.entryNames(), this.entryTypes(), this.alias);
   }
 }
 
@@ -342,7 +338,7 @@ export class DuckDBMapLogicalType extends DuckDBLogicalType {
     );
   }
   public override asType(): DuckDBMapType {
-    return new DuckDBMapType(this.keyType.asType(), this.valueType.asType());
+    return new DuckDBMapType(this.keyType.asType(), this.valueType.asType(), this.alias);
   }
 }
 
@@ -356,7 +352,7 @@ export class DuckDBArrayLogicalType extends DuckDBLogicalType {
     return duckdb.array_type_array_size(this.logical_type);
   }
   public override asType(): DuckDBArrayType {
-    return new DuckDBArrayType(this.valueType.asType(), this.length);
+    return new DuckDBArrayType(this.valueType.asType(), this.length, this.alias);
   }
 }
 
@@ -400,6 +396,6 @@ export class DuckDBUnionLogicalType extends DuckDBLogicalType {
     return valueTypes;
   }
   public override asType(): DuckDBUnionType {
-    return new DuckDBUnionType(this.memberTags(), this.memberTypes());
+    return new DuckDBUnionType(this.memberTags(), this.memberTypes(), this.alias);
   }
 }

api/src/DuckDBResult.ts

@@ -34,9 +34,9 @@ export class DuckDBResult {
     );
   }
   public columnType(columnIndex: number): DuckDBType {
-    return DuckDBLogicalType.consumeAsType(
+    return DuckDBLogicalType.create(
       duckdb.column_logical_type(this.result, columnIndex)
-    );
+    ).asType();
   }
   public get rowsChanged(): number {
     return duckdb.rows_changed(this.result);