[英]How to create a subset from a variant column in snowflake?
例如,假設我的變量列“xyz”包含如下數據:
{
"post_new_visits": "Repeat",
"post_new1_week": "Thursday",
"post_new2_appt": "Weekday",
"post_new3_site": "12:50AM",
"post_new4_channel": "5.0",
"pre_new2_appt": "Weekday",
"pre_new3_site": "12:50AM",
"pre_new4_channel": "5.0"
}
我想從上面的變量列中創建一個新的變量列,它應該只有“post*”鍵值,如下所示,output 應該是這樣的。
{
"post_new_visits": "Repeat",
"post_new1_week": "Thursday",
"post_new2_appt": "Weekday",
"post_new3_site": "12:50AM",
"post_new4_channel": "5.0",
}
有什么辦法可以實現嗎?
也許您可以展平並重新構建 JSON。 例如:
create table tmp ( v variant )
as
select
parse_json(
'{ "post_new_visits": "Repeat",
"post_new1_week": "Thursday",
"post_new2_appt": "Weekday",
"post_new3_site": "12:50AM",
"post_new4_channel": "5.0",
"pre_new2_appt": "Weekday",
"pre_new3_site": "12:50AM",
"pre_new4_channel": "5.0"}'
)
union all
select
parse_json(
'{ "post_new_visits": "New",
"post_new1_week": "Friday",
"post_new2_appt": "Weekday",
"post_new3_site": "13:50AM",
"post_new4_channel": "4.0",
"pre_new2_appt": "Weekday",
"pre_new3_site": "14:50AM",
"pre_new4_channel": "2.0"}'
);
select
OBJECT_AGG(v2.key, v2.value)
from
tmp,
lateral flatten(input => v) v2
where
v2.key like 'post%'
group by
v2.seq;
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