Hi,
On 11/14/19 1:04 PM, Tom Lane wrote:
> As of v12, that WITH will get flattened, so that you still end up
> with three invocations of jsonb_path_query_first, as EXPLAIN VERBOSE
> will show you. You could write "WITH foo AS MATERIALIZED ..." to
> prevent that, but then you'll need to stick the WHERE clause inside
> the WITH or you'll end up running jsonb_path_query_first for every
> row of tbl.
>
> With
>
> explain verbose WITH foo AS materialized (select
> id,
> col1,
> col2,
> jsonb_path_query_first(data,'$.lvl1.lvl2.lvl3.lvl4.lvl5') as jsondata
> from tbl where id = 1 )
> select
> col1,
> col2,
> jsondata->'val1'->'text()' as val1,
> jsondata->'val2'->'text()' as val2,
> jsondata->'val3'->'text()' as val3
> from foo;
>
Thanks Tom ! This works :)
I owe you one.
Best regards,
Jesper
