input_format_null_as_default can work also for nested types inside Tuple/Array/Map

[Avogar]

This can work:

avogar-dev :) select * from format('TSV', 'a Array(UInt64)', $$[\N, \N]$$)

Received exception from server (version 23.6.1):
Code: 130. DB::Exception: Received from localhost:9000. DB::ParsingException. DB::ParsingException: Cannot read array from text, expected comma or end of array, found '\': Could not print diagnostic info because two last rows aren't in buffer (rare case)
: While executing ParallelParsingBlockInputFormat: (at row 1)
. (CANNOT_READ_ARRAY_FROM_TEXT)

It's already done in JSON formats:

avogar-dev :) select * from format('JSONEachRow', 'a Array(UInt64)', '{"a" : [null, null]}')

SELECT *
FROM format('JSONEachRow', 'a Array(UInt64)', '{"a" : [null, null]}')

Query id: 3aff1137-f376-47b9-b1a0-ee7a285a5fd5

┌─a─────┐
│ [0,0] │
└───────┘