diff --git a/java/c/src/main/java/org/apache/arrow/c/BufferImportTypeVisitor.java b/java/c/src/main/java/org/apache/arrow/c/BufferImportTypeVisitor.java index c8b6d07086268..7408bf71136fa 100644 --- a/java/c/src/main/java/org/apache/arrow/c/BufferImportTypeVisitor.java +++ b/java/c/src/main/java/org/apache/arrow/c/BufferImportTypeVisitor.java @@ -80,45 +80,44 @@ public void close() throws Exception { } @VisibleForTesting - long getBufferPtr(ArrowType type, int index) { + ArrowBuf importBuffer(ArrowType type, int index, long capacity) { checkState( - buffers.length > index, - "Expected at least %s buffers for type %s, but found %s", index + 1, type, buffers.length); - if (buffers[index] == NULL) { - throw new IllegalStateException(String.format("Buffer %s for type %s cannot be null", index, type)); + buffers.length > index, + "Expected at least %s buffers for type %s, but found %s", index + 1, type, buffers.length); + long bufferPtr = buffers[index]; + + if (bufferPtr == NULL) { + // C array may be NULL but only accept that if expected capacity is zero too + if (capacity != 0) { + throw new IllegalStateException(String.format("Buffer %s for type %s cannot be null", index, type)); + } else { + // no data in the C array, return an empty buffer + return allocator.getEmpty(); + } } - return buffers[index]; + + ArrowBuf buf = underlyingAllocation.unsafeAssociateAllocation(allocator, capacity, bufferPtr); + imported.add(buf); + return buf; } private ArrowBuf importFixedBits(ArrowType type, int index, long bitsPerSlot) { - final long bufferPtr = getBufferPtr(type, index); final long capacity = DataSizeRoundingUtil.divideBy8Ceil(bitsPerSlot * fieldNode.getLength()); - ArrowBuf buf = underlyingAllocation.unsafeAssociateAllocation(allocator, capacity, bufferPtr); - this.imported.add(buf); - return buf; + return importBuffer(type, index, capacity); } private ArrowBuf importFixedBytes(ArrowType type, int index, long bytesPerSlot) { - final long bufferPtr = getBufferPtr(type, index); final long capacity = bytesPerSlot * fieldNode.getLength(); - ArrowBuf buf = underlyingAllocation.unsafeAssociateAllocation(allocator, capacity, bufferPtr); - this.imported.add(buf); - return buf; + return importBuffer(type, index, capacity); } private ArrowBuf importOffsets(ArrowType type, long bytesPerSlot) { - final long bufferPtr = getBufferPtr(type, 1); final long capacity = bytesPerSlot * (fieldNode.getLength() + 1); - ArrowBuf buf = underlyingAllocation.unsafeAssociateAllocation(allocator, capacity, bufferPtr); - this.imported.add(buf); - return buf; + return importBuffer(type, 1, capacity); } private ArrowBuf importData(ArrowType type, long capacity) { - final long bufferPtr = getBufferPtr(type, 2); - ArrowBuf buf = underlyingAllocation.unsafeAssociateAllocation(allocator, capacity, bufferPtr); - this.imported.add(buf); - return buf; + return importBuffer(type, 2, capacity); } private ArrowBuf maybeImportBitmap(ArrowType type) { diff --git a/java/c/src/test/java/org/apache/arrow/c/ArrowArrayUtilityTest.java b/java/c/src/test/java/org/apache/arrow/c/ArrowArrayUtilityTest.java index 2d31089ca70eb..4a0a966ba1f1f 100644 --- a/java/c/src/test/java/org/apache/arrow/c/ArrowArrayUtilityTest.java +++ b/java/c/src/test/java/org/apache/arrow/c/ArrowArrayUtilityTest.java @@ -56,19 +56,39 @@ void afterEach() { // BufferImportTypeVisitor @Test - void getBufferPtr() throws Exception { + void importBuffer() throws Exception { // Note values are all dummy values here - try (BufferImportTypeVisitor visitor = - new BufferImportTypeVisitor(allocator, dummyHandle, new ArrowFieldNode(0, 0), new long[]{0})) { + try (BufferImportTypeVisitor notEmptyDataVisitor = + new BufferImportTypeVisitor(allocator, dummyHandle, new ArrowFieldNode(/* length= */ 1, 0), new long[]{0})) { // Too few buffers - assertThrows(IllegalStateException.class, () -> visitor.getBufferPtr(new ArrowType.Bool(), 1)); + assertThrows(IllegalStateException.class, () -> notEmptyDataVisitor.importBuffer(new ArrowType.Bool(), 1, 1)); // Null where one isn't expected - assertThrows(IllegalStateException.class, () -> visitor.getBufferPtr(new ArrowType.Bool(), 0)); + assertThrows(IllegalStateException.class, () -> notEmptyDataVisitor.importBuffer(new ArrowType.Bool(), 0, 1)); + + // Expected capacity not zero but c array ptr is NULL (zero) + assertThrows(IllegalStateException.class, () -> notEmptyDataVisitor.importBuffer(new ArrowType.Bool(), 0, 1)); + + // Expected capacity is zero and c array ptr is NULL (zero) + assertThat(notEmptyDataVisitor.importBuffer(new ArrowType.Bool(), 0, 0)).isEqualTo(allocator.getEmpty()); + } + + try (BufferImportTypeVisitor emptyDataVisitor = + new BufferImportTypeVisitor(allocator, dummyHandle, new ArrowFieldNode(/* length= */ 0, 0), new long[]{0})) { + + // Too few buffers + assertThrows(IllegalStateException.class, () -> emptyDataVisitor.importBuffer(new ArrowType.Bool(), 1, 1)); + + // Expected capacity not zero but c array ptr is NULL (zero) + assertThrows(IllegalStateException.class, () -> emptyDataVisitor.importBuffer(new ArrowType.Bool(), 0, 1)); + + // Expected capacity is zero and c array ptr is NULL (zero) + assertThat(emptyDataVisitor.importBuffer(new ArrowType.Bool(), 0, 0)).isEqualTo(allocator.getEmpty()); } } + @Test void cleanupAfterFailure() throws Exception { // Note values are all dummy values here diff --git a/java/c/src/test/java/org/apache/arrow/c/RoundtripTest.java b/java/c/src/test/java/org/apache/arrow/c/RoundtripTest.java index fc73df449bd2c..c1ceb93cb40c0 100644 --- a/java/c/src/test/java/org/apache/arrow/c/RoundtripTest.java +++ b/java/c/src/test/java/org/apache/arrow/c/RoundtripTest.java @@ -534,6 +534,14 @@ public void testListVector() { } } + @Test + public void testEmptyListVector() { + try (final ListVector vector = ListVector.empty("v", allocator)) { + setVector(vector, new ArrayList()); + assertTrue(roundtrip(vector, ListVector.class)); + } + } + @Test public void testLargeListVector() { try (final LargeListVector vector = LargeListVector.empty("v", allocator)) { diff --git a/java/c/src/test/python/integration_tests.py b/java/c/src/test/python/integration_tests.py index c23b4b9b4416e..eb8bb8c4b22df 100644 --- a/java/c/src/test/python/integration_tests.py +++ b/java/c/src/test/python/integration_tests.py @@ -24,6 +24,7 @@ import jpype import pyarrow as pa +import pyarrow.ipc as ipc from pyarrow.cffi import ffi @@ -119,6 +120,10 @@ def close(self): class TestPythonIntegration(unittest.TestCase): + @classmethod + def setUpClass(cls) -> None: + setup_jvm() + def setUp(self): gc.collect() self.old_allocated_python = pa.total_allocated_bytes() @@ -195,7 +200,26 @@ def test_list_array(self): # disabled check_metadata since the list internal field name ("item") # is not preserved during round trips (it becomes "$data$"). ), check_metadata=False) - + + def test_empty_list_array(self): + """Validates GH-37056 fix. + Empty list of int32 produces a vector with empty child data buffer, however with non-zero capacity. + Using streaming forces the c-data array which represent the child data buffer to be NULL (pointer is 0). + On Java side, an attempt to import such array triggered an exception described in GH-37056. + """ + with pa.BufferOutputStream() as bos: + schema = pa.schema([pa.field("f0", pa.list_(pa.int32()), True)]) + with ipc.new_stream(bos, schema) as writer: + src = pa.RecordBatch.from_arrays([pa.array([[]])], schema=schema) + writer.write(src) + data_bytes = bos.getvalue() + + def recreate_batch(): + with pa.input_stream(data_bytes) as ios: + with ipc.open_stream(ios) as reader: + return reader.read_next_batch() + + self.round_trip_record_batch(recreate_batch) def test_struct_array(self): fields = [ @@ -274,5 +298,4 @@ def test_reader_complex_roundtrip(self): if __name__ == '__main__': - setup_jvm() unittest.main(verbosity=2)