C API duckdb_create_list_value is always returning NULL [closed]

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I am trying to insert a list of values to a column INTEGER[]. For that I am creating list value as I need to use appender. But duckdb_create_list_value is always returning NULL. I am using v 1.4.1 C API. This is simplified version of my code

// Create a logical type for a list of integers
duckdb_logical_type int_type = duckdb_create_logical_type(DUCKDB_TYPE_INTEGER);
duckdb_logical_type list_type = duckdb_create_list_type(int_type);

// Create individual integer values for the list elements
duckdb_value val1 = duckdb_create_int32(10);
duckdb_value val2 = duckdb_create_int32(20);
duckdb_value val3 = duckdb_create_int32(30);

// Put values into an array
duckdb_value values[] = {val1, val2, val3};

// Create the list value
duckdb_value list_value = duckdb_create_list_value(list_type, values, 3);
//list_value is NULL

Jeff Raymakers · Accepted Answer · 2025-11-08 22:53:30Z

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Confusingly, the first argument to duckdb_create_list_value should be the type of the values in the list, not the type of the list itself. So, in your example, you would pass int_type, not list_type.

answered Nov 8 at 22:53

Jeff Raymakers

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