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Preserve empty-input values when pulling up aggregate subqueries (bugfix to main) #1933

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Preserve empty-input values when pulling up aggregate subqueries (bugfix to main) #1933

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Preserve empty-input values when pulling up aggregate subqueries
Alena0704 Aug 25, 2026
b780d54
Merge branch 'main' into main-correlated-agg-subquery-left-join
Alena0704 Oct 14, 2026
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19 changes: 9 additions & 10 deletions contrib/pax_storage/src/test/regress/expected/eagerfree.out
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Original file line number Diff line number Diff line change
Expand Up @@ -1398,21 +1398,20 @@ where i < (select count(*) from smallt where smallt.i = smallt2.i) order by 1,2,

explain select smallt2.* from smallt2
where i < (select count(*) from smallt where smallt.i = smallt2.i);
QUERY PLAN
---------------------------------------------------------------------------------------
Gather Motion 3:1 (slice1; segments: 3) (cost=1.57..3.56 rows=11 width=15)
-> Hash Join (cost=1.57..2.82 rows=4 width=15)
QUERY PLAN
-----------------------------------------------------------------------------------------------------------------
Gather Motion 3:1 (slice1; segments: 3) (cost=1.59..3.97 rows=17 width=15)
-> Hash Left Join (cost=1.59..2.86 rows=6 width=15)
Hash Cond: (smallt2.i = "Expr_SUBQUERY".csq_c0)
Join Filter: (smallt2.i < "Expr_SUBQUERY".csq_c1)
Filter: (smallt2.i < CASE WHEN "Expr_SUBQUERY".csq_c1 THEN "Expr_SUBQUERY".csq_c2 ELSE '0'::bigint END)
-> Seq Scan on smallt2 (cost=0.00..1.17 rows=17 width=15)
-> Hash (cost=1.55..1.55 rows=1 width=12)
-> Subquery Scan on "Expr_SUBQUERY" (cost=1.50..1.55 rows=1 width=12)
-> HashAggregate (cost=1.50..1.54 rows=1 width=12)
-> Hash (cost=1.54..1.54 rows=3 width=13)
-> Subquery Scan on "Expr_SUBQUERY" (cost=1.50..1.54 rows=3 width=13)
-> HashAggregate (cost=1.50..1.53 rows=3 width=13)
Group Key: smallt.i
Filter: (smallt.i < count(*))
-> Seq Scan on smallt (cost=0.00..1.33 rows=33 width=4)
Optimizer: Postgres query optimizer
(12 rows)
(11 rows)

-- Sort in MergeJoin
-- start_ignore
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