yql/essentials/tests/sql/suites/lineage/input_optional.txt.attr


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{
    "_yql_row_spec"={
       "Type"=["StructType";[["key";["OptionalType";["DataType";"String"]]];["subkey";["OptionalType";["DataType";"String"]]];["value";["OptionalType";["DataType";"Int64"];];];];];
    }
}