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Fix joinGet with nullable return types.

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This commit is contained in:
Amos Bird 2020-02-05 21:51:41 +08:00
parent 8c23840cc8
commit 0dee987831
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3 changed files with 20 additions and 0 deletions
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7
dbms/src/Functions/FunctionJoinGet.h
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@ -17,6 +17,10 @@ public:
static constexpr auto name = "joinGet";
bool useDefaultImplementationForNulls() const override { return false; }
bool useDefaultImplementationForConstants() const override { return true; }
bool useDefaultImplementationForLowCardinalityColumns() const override { return true; }
void execute(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override;
String getName() const override { return name; }
@ -72,6 +76,9 @@ public:
FunctionBaseImplPtr build(const ColumnsWithTypeAndName & arguments, const DataTypePtr &) const override;
DataTypePtr getReturnType(const ColumnsWithTypeAndName & arguments) const override;
bool useDefaultImplementationForNulls() const override { return false; }
bool useDefaultImplementationForLowCardinalityColumns() const override { return true; }
bool isVariadic() const override { return true; }
size_t getNumberOfArguments() const override { return 0; }

1
dbms/tests/queries/0_stateless/01080_join_get_null.reference Normal file
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@ -0,0 +1 @@
2 2

12
dbms/tests/queries/0_stateless/01080_join_get_null.sql Normal file
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@ -0,0 +1,12 @@
DROP TABLE IF EXISTS test_joinGet;
DROP TABLE IF EXISTS test_join_joinGet;
CREATE TABLE test_joinGet(id Int32, user_id Nullable(Int32)) Engine = Memory();
CREATE TABLE test_join_joinGet(user_id Int32, name String) Engine = Join(ANY, LEFT, user_id);
INSERT INTO test_join_joinGet VALUES (2, 'a'), (6, 'b'), (10, 'c');
SELECT 2 id, toNullable(toInt32(2)) user_id WHERE joinGet(test_join_joinGet, 'name', user_id) != '';
DROP TABLE test_joinGet;
DROP TABLE test_join_joinGet;