fix(query): hash table scatter will always send agg meta

src/query/expression/src/aggregate/payload.rs

@@ -401,15 +401,14 @@ impl Payload {
         true
     }
 
-    pub fn empty_block(&self) -> DataBlock {
-        let columns = self
-            .aggrs
-            .iter()
-            .map(|f| ColumnBuilder::with_capacity(&f.return_type().unwrap(), 0).build())
+    pub fn empty_block(&self, fake_rows: Option<usize>) -> DataBlock {
+        let fake_rows = fake_rows.unwrap_or(0);
+        let columns = (0..self.aggrs.len())
+            .map(|_| ColumnBuilder::repeat_default(&DataType::Binary, fake_rows).build())
             .chain(
                 self.group_types
                     .iter()
-                    .map(|t| ColumnBuilder::with_capacity(t, 0).build()),
+                    .map(|t| ColumnBuilder::repeat_default(t, fake_rows).build()),
             )
             .collect_vec();
         DataBlock::new_from_columns(columns)

src/query/expression/src/aggregate/payload_flush.rs

@@ -121,7 +121,7 @@ impl Payload {
         }
 
         if blocks.is_empty() {
-            return Ok(self.empty_block());
+            return Ok(self.empty_block(None));
         }
         DataBlock::concat(&blocks)
     }
@@ -173,7 +173,7 @@ impl Payload {
         }
 
         if blocks.is_empty() {
-            return Ok(self.empty_block());
+            return Ok(self.empty_block(None));
         }
 
         DataBlock::concat(&blocks)

src/query/service/src/pipelines/processors/transforms/aggregator/aggregate_exchange_injector.rs

@@ -173,26 +173,20 @@ impl FlightScatter for HashTableHashScatter {
                     AggregateMeta::Partitioned { .. } => unreachable!(),
                     AggregateMeta::AggregateSpilling(payload) => {
                         for p in scatter_partitioned_payload(payload, self.buckets)? {
-                            blocks.push(match p.len() == 0 {
-                                true => DataBlock::empty(),
-                                false => DataBlock::empty_with_meta(
-                                    AggregateMeta::create_agg_spilling(p),
-                                ),
-                            });
+                            blocks.push(DataBlock::empty_with_meta(
+                                AggregateMeta::create_agg_spilling(p),
+                            ));
                         }
                     }
                     AggregateMeta::AggregatePayload(p) => {
                         for payload in scatter_payload(p.payload, self.buckets)? {
-                            blocks.push(match payload.len() == 0 {
-                                true => DataBlock::empty(),
-                                false => {
-                                    DataBlock::empty_with_meta(AggregateMeta::create_agg_payload(
-                                        p.bucket,
-                                        payload,
-                                        p.max_partition_count,
-                                    ))
-                                }
-                            });
+                            blocks.push(DataBlock::empty_with_meta(
+                                AggregateMeta::create_agg_payload(
+                                    p.bucket,
+                                    payload,
+                                    p.max_partition_count,
+                                ),
+                            ));
                         }
                     }
                 };

src/query/service/src/pipelines/processors/transforms/aggregator/new_transform_partition_bucket.rs

@@ -212,6 +212,7 @@ impl NewTransformPartitionBucket {
     #[allow(unused_assignments)]
     fn add_bucket(&mut self, mut data_block: DataBlock) -> Result<(isize, usize)> {
         let (mut bucket, mut partition_count) = (0, 0);
+        let mut is_empty_block = false;
         if let Some(block_meta) = data_block.get_meta() {
             if let Some(block_meta) = AggregateMeta::downcast_ref_from(block_meta) {
                 (bucket, partition_count) = match block_meta {
@@ -250,7 +251,11 @@ impl NewTransformPartitionBucket {
                         if let Some(AggregateMeta::Spilled(buckets_payload)) =
                             AggregateMeta::downcast_from(meta)
                         {
-                            let partition_count = buckets_payload[0].max_partition_count;
+                            let partition_count = if !buckets_payload.is_empty() {
+                                buckets_payload[0].max_partition_count
+                            } else {
+                                MAX_PARTITION_COUNT
+                            };
                             self.max_partition_count =
                                 self.max_partition_count.max(partition_count);
 
@@ -274,12 +279,14 @@ impl NewTransformPartitionBucket {
                         unreachable!()
                     }
                     AggregateMeta::Serialized(payload) => {
+                        is_empty_block = payload.data_block.is_empty();
                         self.max_partition_count =
                             self.max_partition_count.max(payload.max_partition_count);
 
                         (payload.bucket, payload.max_partition_count)
                     }
                     AggregateMeta::AggregatePayload(payload) => {
+                        is_empty_block = payload.payload.len() == 0;
                         self.max_partition_count =
                             self.max_partition_count.max(payload.max_partition_count);
 
@@ -298,23 +305,25 @@ impl NewTransformPartitionBucket {
             ));
         }
 
-        if self.all_inputs_init {
-            if partition_count != self.max_partition_count {
-                return Err(ErrorCode::Internal(
+        if !is_empty_block {
+            if self.all_inputs_init {
+                if partition_count != self.max_partition_count {
+                    return Err(ErrorCode::Internal(
                     "Internal, the partition count does not equal the max partition count on TransformPartitionBucket.
                     ",
                 ));
-            }
-            match self.buckets_blocks.entry(bucket) {
-                Entry::Vacant(v) => {
-                    v.insert(vec![data_block]);
-                }
-                Entry::Occupied(mut v) => {
-                    v.get_mut().push(data_block);
                 }
-            };
-        } else {
-            self.unpartitioned_blocks.push(data_block);
+                match self.buckets_blocks.entry(bucket) {
+                    Entry::Vacant(v) => {
+                        v.insert(vec![data_block]);
+                    }
+                    Entry::Occupied(mut v) => {
+                        v.get_mut().push(data_block);
+                    }
+                };
+            } else {
+                self.unpartitioned_blocks.push(data_block);
+            }
         }
 
         Ok((bucket, partition_count))

src/query/service/src/pipelines/processors/transforms/aggregator/serde/serde_meta.rs

@@ -31,28 +31,23 @@ pub struct AggregateSerdeMeta {
     pub columns_layout: Vec<usize>,
     // use for new agg hashtable
     pub max_partition_count: usize,
+    pub is_empty: bool,
 }
 
 impl AggregateSerdeMeta {
-    pub fn create(bucket: isize) -> BlockMetaInfoPtr {
-        Box::new(AggregateSerdeMeta {
-            typ: BUCKET_TYPE,
-            bucket,
-            location: None,
-            data_range: None,
-            columns_layout: vec![],
-            max_partition_count: 0,
-        })
-    }
-
-    pub fn create_agg_payload(bucket: isize, max_partition_count: usize) -> BlockMetaInfoPtr {
+    pub fn create_agg_payload(
+        bucket: isize,
+        max_partition_count: usize,
+        is_empty: bool,
+    ) -> BlockMetaInfoPtr {
         Box::new(AggregateSerdeMeta {
             typ: BUCKET_TYPE,
             bucket,
             location: None,
             data_range: None,
             columns_layout: vec![],
             max_partition_count,
+            is_empty,
         })
     }
 
@@ -61,6 +56,7 @@ impl AggregateSerdeMeta {
         location: String,
         data_range: Range<u64>,
         columns_layout: Vec<usize>,
+        is_empty: bool,
     ) -> BlockMetaInfoPtr {
         Box::new(AggregateSerdeMeta {
             typ: SPILLED_TYPE,
@@ -69,6 +65,7 @@ impl AggregateSerdeMeta {
             location: Some(location),
             data_range: Some(data_range),
             max_partition_count: 0,
+            is_empty,
         })
     }
 
@@ -86,6 +83,7 @@ impl AggregateSerdeMeta {
             location: Some(location),
             data_range: Some(data_range),
             max_partition_count,
+            is_empty: false,
         })
     }
 }

src/query/service/src/pipelines/processors/transforms/aggregator/serde/transform_aggregate_serializer.rs

@@ -183,6 +183,7 @@ pub struct SerializeAggregateStream {
     pub payload: Pin<Box<SerializePayload>>,
     flush_state: PayloadFlushState,
     end_iter: bool,
+    nums: usize,
 }
 
 unsafe impl Send for SerializeAggregateStream {}
@@ -198,6 +199,7 @@ impl SerializeAggregateStream {
             flush_state: PayloadFlushState::default(),
             _params: params.clone(),
             end_iter: false,
+            nums: 0,
         }
     }
 }
@@ -225,10 +227,32 @@ impl SerializeAggregateStream {
                 }
 
                 match block {
-                    Some(block) => Ok(Some(block.add_meta(Some(
-                        AggregateSerdeMeta::create_agg_payload(p.bucket, p.max_partition_count),
-                    ))?)),
-                    None => Ok(None),
+                    Some(block) => {
+                        self.nums += 1;
+                        Ok(Some(block.add_meta(Some(
+                            AggregateSerdeMeta::create_agg_payload(
+                                p.bucket,
+                                p.max_partition_count,
+                                false,
+                            ),
+                        ))?))
+                    }
+                    None => {
+                        // always return at least one block
+                        if self.nums == 0 {
+                            self.nums += 1;
+                            let block = p.payload.empty_block(Some(1));
+                            Ok(Some(block.add_meta(Some(
+                                AggregateSerdeMeta::create_agg_payload(
+                                    p.bucket,
+                                    p.max_partition_count,
+                                    true,
+                                ),
+                            ))?))
+                        } else {
+                            Ok(None)
+                        }
+                    }
                 }
             }
         }

src/query/service/src/pipelines/processors/transforms/aggregator/serde/transform_deserializer.rs

@@ -89,18 +89,26 @@ impl TransformDeserializer {
                 }
                 Some(meta) => {
                     return match meta.typ == BUCKET_TYPE {
-                        true => Ok(DataBlock::empty_with_meta(
-                            AggregateMeta::create_serialized(
-                                meta.bucket,
-                                deserialize_block(
-                                    dict,
-                                    fragment_data,
-                                    &self.schema,
-                                    self.arrow_schema.clone(),
-                                )?,
-                                meta.max_partition_count,
-                            ),
-                        )),
+                        true => {
+                            let mut block = deserialize_block(
+                                dict,
+                                fragment_data,
+                                &self.schema,
+                                self.arrow_schema.clone(),
+                            )?;
+
+                            if meta.is_empty {
+                                block = block.slice(0..0);
+                            }
+
+                            Ok(DataBlock::empty_with_meta(
+                                AggregateMeta::create_serialized(
+                                    meta.bucket,
+                                    block,
+                                    meta.max_partition_count,
+                                ),
+                            ))
+                        }
                         false => {
                             let data_schema = Arc::new(exchange_defines::spilled_schema());
                             let arrow_schema = Arc::new(exchange_defines::spilled_arrow_schema());

src/query/service/src/pipelines/processors/transforms/aggregator/serde/transform_exchange_aggregate_serializer.rs

@@ -149,31 +149,28 @@ impl BlockMetaTransform<ExchangeShuffleMeta> for TransformExchangeAggregateSeria
                 }
 
                 Some(AggregateMeta::AggregatePayload(p)) => {
+                    let (bucket, max_partition_count) = (p.bucket, p.max_partition_count);
+
                     if index == self.local_pos {
                         serialized_blocks.push(FlightSerialized::DataBlock(
                             block.add_meta(Some(Box::new(AggregateMeta::AggregatePayload(p))))?,
                         ));
                         continue;
                     }
 
-                    let bucket = compute_block_number(p.bucket, p.max_partition_count)?;
+                    let block_number = compute_block_number(bucket, max_partition_count)?;
                     let stream = SerializeAggregateStream::create(
                         &self.params,
                         SerializePayload::AggregatePayload(p),
                     );
                     let mut stream_blocks = stream.into_iter().collect::<Result<Vec<_>>>()?;
-
-                    if stream_blocks.is_empty() {
-                        serialized_blocks.push(FlightSerialized::DataBlock(DataBlock::empty()));
-                    } else {
-                        let mut c = DataBlock::concat(&stream_blocks)?;
-                        if let Some(meta) = stream_blocks[0].take_meta() {
-                            c.replace_meta(meta);
-                        }
-
-                        let c = serialize_block(bucket, c, &self.options)?;
-                        serialized_blocks.push(FlightSerialized::DataBlock(c));
+                    debug_assert!(!stream_blocks.is_empty());
+                    let mut c = DataBlock::concat(&stream_blocks)?;
+                    if let Some(meta) = stream_blocks[0].take_meta() {
+                        c.replace_meta(meta);
                     }
+                    let c = serialize_block(block_number, c, &self.options)?;
+                    serialized_blocks.push(FlightSerialized::DataBlock(c));
                 }
             };
         }

src/query/service/src/pipelines/processors/transforms/aggregator/transform_aggregate_final.rs

@@ -59,6 +59,7 @@ impl TransformFinalAggregate {
                     AggregateMeta::Serialized(payload) => match agg_hashtable.as_mut() {
                         Some(ht) => {
                             debug_assert!(bucket == payload.bucket);
+
                             let payload = payload.convert_to_partitioned_payload(
                                 self.params.group_data_types.clone(),
                                 self.params.aggregate_functions.clone(),

src/query/service/src/pipelines/processors/transforms/range_join/ie_join_state.rs

@@ -125,6 +125,10 @@ impl IEJoinState {
     fn intersection(&self, left_block: &DataBlock, right_block: &DataBlock) -> bool {
         let left_len = left_block.num_rows();
         let right_len = right_block.num_rows();
+        if left_len == 0 || right_len == 0 {
+            return false;
+        }
+
         let left_l1_column = left_block.columns()[0]
             .value
             .convert_to_full_column(&self.l1_data_type, left_len);

src/query/service/src/pipelines/processors/transforms/transform_srf.rs

@@ -113,6 +113,9 @@ impl BlockingTransform for TransformSRF {
         }
 
         let input = self.input.take().unwrap();
+        if input.is_empty() {
+            return Ok(None);
+        }
 
         let mut result_size = 0;
         let mut used = 0;

tests/suites/0_stateless/19_fuzz/19_0004_fuzz_filter.py

@@ -23,4 +23,4 @@
 
 for i in range(num_predicates):
     sql = f"explain analyze partial select * from t where a >= {int(step * i)};"
-    client1.run(sql)
+    client1.run(sql)