[Java] VectorSchemaRoot convertion into ArrowArrayStream
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描述
### Describe the enhancement requested
DuckDB support ArrowArrayStream as virtual table. JDBC driver of DuckDB has "register" ArrowStream method on DuckDBConnection.
VectorSchemaRoot convertion into ArrowArrayStream object will allows perform complex SQL transformation with CTE,window function on existing Arrow data from java process without data format transformation and also as workaround to write parquet file from VectorSchemaRoot.
```
try (DuckDBConnection connection = (DuckDBConnection) DriverManager.getConnection("jdbc:duckdb:")){
connection.registerArrowStream("arrow_stream", arrowArrayStream);
try (Statement preparedStatement = connection.createStatement()){
preparedStatement.executeUpdate("COPY (SELECT * FROM arrow_stream) TO '"+filePath+"' (FORMAT 'PARQUET', CODEC 'ZSTD')");
}
}
```
@lidavidm do you have idea how to implement such conversion?
### Component(s)
Java
贡献指南
调研方向
从 Java 组件和 issue 中的 DuckDB JDBC 示例开始,然后结合 DuckDBConnection.registerArrowStream 检查 VectorSchemaRoot 和 ArrowArrayStream API。完成的标准是:VectorSchemaRoot 可以转换为 ArrowArrayStream,并且所示的注册和 SQL 工作流可以在不进行格式转换的情况下消费它。
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