yql/essentials/tests/sql/suites/blocks/input_strings_opt.txt.attr


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{"_yql_row_spec"={
	"Type"=["StructType";[
		["key";["OptionalType"; ["DataType";"String"]]];
		["s";["DataType";"String"]];
		["s_opt";["OptionalType"; ["DataType";"String"]]];
		["utf";["DataType";"Utf8"]]
	]];
}}