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test: add UnionArray hashing SQL coverage. #24199

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Merged
Jefffrey merged 1 commit into from
Aug 10, 2026
+52 −2
Merged

test: add UnionArray hashing SQL coverage. #24199

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7 changes: 5 additions & 2 deletions datafusion/sqllogictest/src/test_context.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -573,14 +573,17 @@ fn register_union_table(ctx: &SessionContext) {
],
)
.unwrap(),
ScalarBuffer::from(vec![3, 1, 3]),
ScalarBuffer::from(vec![3, 1, 3, 3, 1, 3]),
None,
vec![
Arc::new(Int32Array::from(vec![1, 2, 3])),
Arc::new(Int32Array::from(vec![1, 2, 3, 1, 5, 3])),
Arc::new(StringArray::from(vec![
Some("foo"),
Some("bar"),
Some("baz"),
Some("qux"),
Some("bar"),
Some("quux"),
])),
],
)
Expand Down
47 changes: 47 additions & 0 deletions datafusion/sqllogictest/test_files/union_function.slt
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,9 @@ select union_column, union_extract(union_column, 'int') from union_table;
{int=1} 1
{string=bar} NULL
{int=3} 3
{int=1} 1
{string=bar} NULL
{int=3} 3

query error DataFusion error: Execution error: field bool not found on union
select union_extract(union_column, 'bool') from union_table;
Expand Down Expand Up @@ -56,6 +59,9 @@ select union_column, union_tag(union_column) from union_table;
{int=1} int
{string=bar} string
{int=3} int
{int=1} int
{string=bar} string
{int=3} int

query error DataFusion error: Error during planning: 'union_tag' does not support zero arguments
select union_tag() from union_table;
Expand All @@ -65,3 +71,44 @@ select union_tag(union_column, 'int') from union_table;

query error DataFusion error: Execution error: union_tag only support unions, got Utf8
select union_tag('int') from union_table;

##########
## UNION Hashing Tests
##########

query ?I
select union_column, count(*)
from union_table
group by union_column
order by union_column;
----
{string=bar} 2
{int=1} 2
{int=3} 2

query ?
select distinct union_column
from union_table
order by union_column;
----
{string=bar}
{int=1}
{int=3}

query I
select count(distinct union_column) from union_table;
----
3

query ?II
select
union_column,
count(*),
sum(union_extract(union_column, 'int'))
from union_table
group by union_column
order by union_column;
----
{string=bar} 2 NULL
{int=1} 2 2
{int=3} 2 6
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