feat: support sort agg

Signed-off-by: kikkon <nian920@outlook.com>

Author: Kikkon

src/executor/mod.rs

@@ -41,6 +41,8 @@ use self::order::*;
 use self::projection::*;
 use self::simple_agg::*;
 #[allow(unused_imports)]
+use self::sort_agg::*;
+#[allow(unused_imports)]
 use self::sort_merge_join::*;
 use self::table_scan::*;
 use self::top_n::TopNExecutor;
@@ -72,6 +74,7 @@ mod nested_loop_join;
 mod order;
 mod projection;
 mod simple_agg;
+mod sort_agg;
 mod sort_merge_join;
 mod table_scan;
 mod top_n;

src/executor/sort_agg.rs

@@ -0,0 +1,245 @@
+// Copyright 2022 RisingLight Project Authors. Licensed under Apache-2.0.
+#![allow(dead_code)]
+use smallvec::SmallVec;
+
+use super::*;
+use crate::array::{ArrayBuilderImpl, ArrayImpl};
+use crate::binder::BoundAggCall;
+use crate::types::{DataTypeExt, DataTypeKind};
+
+pub struct SortAggExecutor {
+    pub agg_calls: Vec<BoundAggCall>,
+    pub group_keys: Vec<BoundExpr>,
+    pub child: BoxedExecutor,
+}
+
+impl SortAggExecutor {
+    #[try_stream(boxed, ok = DataChunk, error = ExecutorError)]
+    pub async fn execute(self) {
+        let mut last_key = None::<HashKey>;
+        let mut states = create_agg_states(&self.agg_calls);
+
+        #[for_await]
+        for chunk in self.child {
+            // Eval group keys and arguments
+            let chunk = chunk?;
+            let exprs: SmallVec<[ArrayImpl; 16]> = self
+                .agg_calls
+                .iter()
+                .map(|agg| agg.args[0].eval(&chunk))
+                .try_collect()?;
+            let group_cols: SmallVec<[ArrayImpl; 16]> = self
+                .group_keys
+                .iter()
+                .map(|e| e.eval(&chunk))
+                .try_collect()?;
+
+            let num_rows = chunk.cardinality();
+            for row_idx in 0..num_rows {
+                // Create group key
+                let mut group_key = HashKey::new();
+                for col in group_cols.iter() {
+                    group_key.push(col.get(row_idx));
+                }
+                // Check group key & lask key
+                match last_key {
+                    Some(last_key) => {
+                        if last_key != group_key {
+                            yield Self::finish_agg(&states);
+                            states = create_agg_states(&self.agg_calls);
+                        }
+                    }
+                    None => (),
+                }
+                for (state, expr) in states.iter_mut().zip_eq(&exprs) {
+                    state.update_single(&expr.get(row_idx))?;
+                }
+                last_key = Some(group_key);
+            }
+        }
+        yield Self::finish_agg(&states);
+
+    }
+
+    fn finish_agg(states: &SmallVec<[Box<dyn AggregationState>; 16]>) -> DataChunk {
+        return states
+            .iter()
+            .map(|s| {
+                let result = &s.output();
+                match &result.data_type() {
+                    Some(r) => {
+                        let mut builder = ArrayBuilderImpl::with_capacity(1, r);
+                        builder.push(result);
+                        builder.finish()
+                    }
+                    None => ArrayBuilderImpl::new(&DataTypeKind::Int(None).nullable()).finish(),
+                }
+            })
+            .collect::<DataChunk>();
+    }
+}
+
+#[cfg(test)]
+mod tests {
+
+    use super::*;
+    use crate::array::ArrayImpl;
+    use crate::binder::{AggKind, BoundInputRef};
+    use crate::types::{DataType, DataTypeKind};
+
+    #[tokio::test]
+    async fn test_multi_group_agg() {
+        test_group_agg(
+            vec![0, 1],
+            vec![1, 2],
+            vec![
+                vec![1.1, 0.2, 0.3, 0.4, 0.5],
+                vec![1.1, 1.1, 1.3, 1.4, 1.5],
+                vec![1.2, 1.2, 2.3, 2.4, 2.5],
+            ],
+            vec![
+                vec![1.3, 2.2],
+                vec![0.3, 1.3],
+                vec![0.4, 1.4],
+                vec![0.5, 1.5],
+            ],
+        )
+        .await;
+        test_group_agg(
+            vec![0, 1],
+            vec![1, 2],
+            vec![
+                vec![0.1, 0.2, 0.3, 0.4, 0.5],
+                vec![1.1, 1.1, 1.3, 1.4, 1.5],
+                vec![1.1, 1.2, 2.3, 2.4, 2.5],
+            ],
+            vec![
+                vec![0.1, 1.1],
+                vec![0.2, 1.1],
+                vec![0.3, 1.3],
+                vec![0.4, 1.4],
+                vec![0.5, 1.5],
+            ],
+        )
+        .await
+    }
+
+    #[tokio::test]
+    async fn test_single_group_agg() {
+        test_group_agg(
+            vec![0, 1],
+            vec![0],
+            vec![vec![1.0, 1.0], vec![1.0, 2.0]],
+            vec![vec![2.0, 3.0]],
+        )
+        .await;
+        test_group_agg(
+            vec![0, 1],
+            vec![1],
+            vec![
+                vec![1.1, 0.2, 0.3, 0.4, 0.5],
+                vec![1.1, 1.1, 1.3, 1.4, 1.5],
+                vec![2.1, 2.2, 2.3, 2.4, 2.5],
+            ],
+            vec![
+                vec![1.3, 2.2],
+                vec![0.3, 1.3],
+                vec![0.4, 1.4],
+                vec![0.5, 1.5],
+            ],
+        )
+        .await;
+        test_group_agg(
+            vec![0, 1],
+            vec![1],
+            vec![
+                vec![0.1, 0.2, 0.3, 0.4, 0.5],
+                vec![1.1, 1.2, 1.3, 1.4, 1.5],
+                vec![2.1, 2.2, 2.3, 2.4, 2.5],
+            ],
+            vec![
+                vec![0.1, 1.1],
+                vec![0.2, 1.2],
+                vec![0.3, 1.3],
+                vec![0.4, 1.4],
+                vec![0.5, 1.5],
+            ],
+        )
+        .await
+    }
+
+    async fn test_group_agg(
+        agg_call_index: Vec<usize>,
+        group_key_index: Vec<usize>,
+        cols: Vec<Vec<f64>>,
+        expected_cols: Vec<Vec<f64>>,
+    ) {
+        let mut agg_calls = vec![];
+        for index in agg_call_index {
+            agg_calls.push(create_sum_agg_call(index));
+        }
+
+        let mut group_keys = vec![];
+        for index in group_key_index {
+            group_keys.push(create_input_ref(index));
+        }
+
+        let child: BoxedExecutor = async_stream::try_stream! {
+            let mut child = vec![];
+            for col in cols {
+                child.push(ArrayImpl::new_float64(col.into_iter().collect()));
+            }
+            yield child.into_iter().collect()
+        }
+        .boxed();
+
+        let executor = SortAggExecutor {
+            agg_calls,
+            group_keys,
+            child,
+        };
+        let mut executor = executor.execute();
+
+        let mut expected_cols_size = 0;
+        while let Some(chunk) = executor.next().await {
+            let chunk = chunk.unwrap();
+            let expected_col = expected_cols.get(expected_cols_size).unwrap();
+            let mut expected_array = vec![];
+            for data in expected_col {
+                expected_array.push(ArrayImpl::new_float64(vec![*data].into_iter().collect()));
+            }
+            assert_eq!(chunk.arrays(), expected_array);
+            expected_cols_size += 1;
+        }
+        assert_eq!(expected_cols_size, expected_cols.len());
+    }
+
+    fn create_sum_agg_call(value: usize) -> BoundAggCall {
+        BoundAggCall {
+            kind: AggKind::Sum,
+            args: vec![BoundExpr::InputRef(BoundInputRef {
+                index: value,
+                return_type: DataType::new(
+                    DataTypeKind::Decimal(Option::Some(15), Option::Some(2)),
+                    false,
+                ),
+            })],
+            return_type: DataType::new(DataTypeKind::Double, false),
+        }
+    }
+
+    fn create_input_ref(value: usize) -> BoundExpr {
+        BoundExpr::InputRef(BoundInputRef {
+            index: value,
+            return_type: DataType::new(DataTypeKind::Int(Option::None), false),
+        })
+    }
+
+    fn create_expected_col(cols: Vec<f64>) -> Vec<ArrayImpl> {
+        let mut expected = Vec::new();
+        for col in cols {
+            expected.push(ArrayImpl::new_float64([col].into_iter().collect()));
+        }
+        expected
+    }
+}