ydb/yql/essentials/tests/sql/suites/blocks/and_opt.sql

$data = [
    <|x:false,y:false|>,
    <|x:false,y:true|>,
    <|x:false,y:null|>,
    <|x:true,y:false|>,
    <|x:true,y:true|>,
    <|x:true,y:null|>,
    <|x:null,y:false|>,
    <|x:null,y:true|>,
    <|x:null,y:null|>,
];

select x and y from as_table($data);