ERROR: no binary output function available for type theta_sketch

```
PostgreSQL 15.7
Citus 12.1.-1
datasketches 1.6.0
```

```
select version();
version
---------------------------------------------------------------------------------------------------------
PostgreSQL 15.7 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-44), 64-bit
```

```
explain analyze select report_date, campaign_id, theta_sketch_get_estimate(theta_sketch_union(reach))
from
(select report_date,campaign_id, theta_sketch_union(reach_ds) as reach
from report_day where service_account_id='599267'
group by report_date, campaign_id,representative_id
) a
group by report_date, campaign_id
order by campaign_id, report_date
limit 10;

ERROR: 42883: no binary output function available for type theta_sketch
CONTEXT: while executing command on postgres-citus09:5432
LOCATION: ReportResultError, remote_commands.c:324
Time: 1248.635 ms (00:01.249)
```

```
explain select report_date, campaign_id, theta_sketch_get_estimate(theta_sketch_union(reach))
from
(select report_date,campaign_id, theta_sketch_union(reach_ds) as reach
from report_day where service_account_id='599267'
group by report_date, campaign_id,representative_id
) a
group by report_date, campaign_id
order by campaign_id, report_date
limit 10;

QUERY PLAN
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Limit (cost=757.32..757.35 rows=10 width=20)
-> Sort (cost=757.32..757.82 rows=200 width=20)
Sort Key: remote_scan.campaign_id, remote_scan.report_date
-> HashAggregate (cost=750.00..753.00 rows=200 width=20)
Group Key: remote_scan.campaign_id, remote_scan.report_date
-> Custom Scan (Citus Adaptive) (cost=0.00..0.00 rows=100000 width=44)
Task Count: 128
Tasks Shown: One of 128
-> Task
Node: host=postgres-citus02 port=5432 dbname=citus_poc
-> Subquery Scan on a (cost=97482.75..108129.48 rows=31046 width=44)
-> Finalize GroupAggregate (cost=97482.75..107819.02 rows=31046 width=52)
Group Key: report_day.report_date, report_day.campaign_id, report_day.representative_id
-> Gather Merge (cost=97482.75..106654.80 rows=62092 width=52)
Workers Planned: 2
-> Partial GroupAggregate (cost=96482.73..98487.82 rows=31046 width=52)
Group Key: report_day.report_date, report_day.campaign_id, report_day.representative_id
-> Sort (cost=96482.73..96806.13 rows=129361 width=147)
Sort Key: report_day.report_date, report_day.campaign_id, report_day.representative_id
-> Parallel Append (cost=309.83..78549.31 rows=129361 width=147)
-> Parallel Bitmap Heap Scan on report_day_p20240606_104824 report_day_1 (cost=372.08..5512.13 rows=15365 width=147)
Recheck Cond: (service_account_id = '599267'::bigint)
-> Bitmap Index Scan on report_day_p20240606_service_account_id_report_date_idx_104824 (cost=0.00..362.86 rows=36875 width=0)
Index Cond: (service_account_id = '599267'::bigint)
-> Parallel Bitmap Heap Scan on report_day_p20240608_105080 report_day_3 (cost=309.83..5381.77 rows=12555 width=147)
Recheck Cond: (service_account_id = '599267'::bigint)
-> Bitmap Index Scan on report_day_p20240608_service_account_id_report_date_idx_105080 (cost=0.00..302.29 rows=30133 width=0)
Index Cond: (service_account_id = '599267'::bigint)
....

```

Hi.

When using the datasketches parallel aggregate function on distributed tables in Citus, an error occurs as seen in 'explain analyze'. However, if I run a query without an analyze or use only 'explain', it works fine.