clickhouse_fdw
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NULL instead of empty string in response
I use ClickHouse FDW in a non-standard way, instead of Clickhouse DB I use my own http server that returns TSV formatted data to FDW. I expect response to contain some empty string fields, but I'm getting NULL instead.
So is there any kind of config option in FDW to/not to treat empty string as NULL or is there any special ouput format for empty strings, not just "" in ClickHouse?