test_data_chunk

[ludnic]

List of functions needed for test_data_chunk.f90

• duckdb_append_data_chunk
• duckdb_appender_create
• duckdb_appender_destroy
• duckdb_close
• duckdb_column_count
• duckdb_connect
• duckdb_create_data_chunk
• duckdb_create_list_type
• duckdb_create_logical_type
• duckdb_create_map_type
• duckdb_data_chunk_get_column_count
• duckdb_data_chunk_get_size
• duckdb_data_chunk_get_vector
• duckdb_data_chunk_reset
• duckdb_data_chunk_set_size
• duckdb_destroy_data_chunk
• duckdb_destroy_logical_type
• duckdb_destroy_result
• duckdb_disconnect
• duckdb_get_type_id
• duckdb_list_type_child_type
• duckdb_list_vector_get_child
• duckdb_list_vector_get_size
• duckdb_list_vector_reserve
• duckdb_list_vector_set_size
• duckdb_map_type_key_type
• duckdb_map_type_value_type
• duckdb_open
• duckdb_query
• duckdb_result_chunk_count
• duckdb_result_get_chunk
• duckdb_validity_row_is_valid
• duckdb_validity_set_row_validity
• duckdb_vector_get_column_type
• duckdb_vector_get_data
• duckdb_vector_get_validity
• duckdb_vector_size

[freevryheid]

The lines following
https://github.com/freevryheid/duckdb/blob/main/test/test_data_chunk.f90#L239

don't look right to me.

I'm still trying to figure out this function that returns a c pointer:
duckdb_vector_get_data

From:
https://github.com/duckdb/duckdb/blob/master/test/api/capi/test_capi_data_chunk.cpp#L135

The lines

	auto col1_ptr = (int64_t *)duckdb_vector_get_data(duckdb_data_chunk_get_vector(data_chunk, 0));
	*col1_ptr = 42;

I don't know c++ but I suspect that the function

duckdb_data_chunk_get_vector(data_chunk, 0)

should return a c_int64_t. Why I don't know as data_chunk in the test appears to be NULL. 42 is then mapped to this memory address.

We may need a helper function for duckdb_vector_get_data that converts the c pointer to a fortran (target) pointer that we can then map/assign to as in "=>"