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Fix alias of DuckDBPyRelation.query (closes #468) #524

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Merged
evertlammerts merged 3 commits into from
Jul 1, 2026
Merged

Fix alias of DuckDBPyRelation.query (closes #468) #524

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f488eea
Close #468
leostimpfle Jun 30, 2026
a24ecfe
Add test for query chaining with alias
leostimpfle Jun 30, 2026
50d1f00
fix format
evertlammerts Jul 1, 2026
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5 changes: 3 additions & 2 deletions src/duckdb_py/pyrelation.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1550,8 +1550,9 @@ unique_ptr<DuckDBPyRelation> DuckDBPyRelation::Query(const string &view_name, co
auto &statement = *parser.statements[0];
if (statement.type == StatementType::SELECT_STATEMENT) {
auto select_statement = unique_ptr_cast<SQLStatement, SelectStatement>(std::move(parser.statements[0]));
auto query_relation = make_shared_ptr<QueryRelation>(rel->context->GetContext(), std::move(select_statement),
sql_query, "query_relation");
auto query_relation =
make_shared_ptr<QueryRelation>(rel->context->GetContext(), std::move(select_statement),
"query_relation_" + StringUtil::GenerateRandomName(16), sql_query);
return DeriveRelation(std::move(query_relation));
} else if (IsDescribeStatement(statement)) {
auto query = PragmaShow(view_name);
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13 changes: 13 additions & 0 deletions tests/fast/relational_api/test_rapi_query.py
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Expand Up @@ -38,6 +38,19 @@ def test_query_chain(self, steps):
result = rel.execute()
assert len(result.fetchall()) == amount

def test_query_chain_using_alias(self):
# Test query chaining using DuckDBPyRelation.alias
con = duckdb.connect()
con.execute("CREATE TABLE raw (yr INT, facility VARCHAR, val DOUBLE)")
con.execute("INSERT INTO raw VALUES (2020, 'F001', 1.0), (2021, 'F001', 2.0)")
data = con.sql("SELECT * FROM raw")
step1 = data.query(data.alias, f"SELECT *, val * 2 AS val_doubled FROM {data.alias}")
step2 = step1.query(step1.alias, f"SELECT *, val_doubled + 1 AS val_incremented FROM {step1.alias}")
assert step2.fetchall() == [
(2020, "F001", 1.0, 2.0, 3.0),
(2021, "F001", 2.0, 4.0, 5.0),
]

@pytest.mark.parametrize("input", [[5, 4, 3], [], [1000]])
def test_query_table(self, tbl_table, input):
con = duckdb.default_connection()
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