Remove NULL columnsSQL

CREATE OR REPLACE MACRO notnullcols(tablename) AS (
	WITH t1 AS (
			UNPIVOT( FROM query_table(tablename) SELECT max( columns(*)) ) 
			ON columns(*)::varchar
	) FROM t1 SELECT list(name) 
) ;

SET VARIABLE notnullcols = notnullcols(t);

FROM t SELECT columns(c -> list_contains(getvariable('notnullcols'), c)) ;
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