JDBC: ResultSet.getObject(int, java.util.Map.class) fails for MAP column  #901

Bug description

For a MAP column, DuckDB JDBC reports java.util.LinkedHashMap as the column class through ResultSetMetaData, but ResultSet.getObject(..., Map.class) fails with a conversion error.

Reproduction

Create a table containing a MAP column:

CREATE TABLE test_table (
    map_col MAP(VARCHAR, INTEGER) NOT NULL
);

Execute a simple query:

SELECT map_col FROM test_table;

The ResultSetMetaData reports:

However, attempting to retrieve the value using the JDBC typed getter:

Map<?, ?> value = resultSet.getObject(1, Map.class);

fails with:

java.sql.SQLException: Can't convert value to interface java.util.Map, SQL type: MAP

Environment

• DuckDB JDBC: 1.5.6.0
• SQL type: MAP(VARCHAR, INTEGER)
• Java type reported by metadata: java.util.LinkedHashMap
• JDBC type: java.sql.Types.OTHER (1111)