feat: add initial support for array_exists with lambda expression support

native/core/src/execution/expressions/array.rs

@@ -0,0 +1,67 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+//! Array expression builders
+
+use std::sync::Arc;
+
+use arrow::datatypes::SchemaRef;
+use datafusion::physical_expr::PhysicalExpr;
+use datafusion_comet_proto::spark_expression::Expr;
+use datafusion_comet_spark_expr::{ArrayExistsExpr, LambdaVariableExpr};
+
+use crate::execution::operators::ExecutionError;
+use crate::execution::planner::expression_registry::ExpressionBuilder;
+use crate::execution::planner::PhysicalPlanner;
+use crate::execution::serde::to_arrow_datatype;
+use crate::extract_expr;
+
+pub struct ArrayExistsBuilder;
+
+impl ExpressionBuilder for ArrayExistsBuilder {
+    fn build(
+        &self,
+        spark_expr: &Expr,
+        input_schema: SchemaRef,
+        planner: &PhysicalPlanner,
+    ) -> Result<Arc<dyn PhysicalExpr>, ExecutionError> {
+        let expr = extract_expr!(spark_expr, ArrayExists);
+        let array_expr =
+            planner.create_expr(expr.array.as_ref().unwrap(), Arc::clone(&input_schema))?;
+        let lambda_body = planner.create_expr(expr.lambda_body.as_ref().unwrap(), input_schema)?;
+        Ok(Arc::new(ArrayExistsExpr::new(
+            array_expr,
+            lambda_body,
+            expr.follow_three_valued_logic,
+        )))
+    }
+}
+
+pub struct LambdaVariableBuilder;
+
+impl ExpressionBuilder for LambdaVariableBuilder {
+    fn build(
+        &self,
+        spark_expr: &Expr,
+        _input_schema: SchemaRef,
+        _planner: &PhysicalPlanner,
+    ) -> Result<Arc<dyn PhysicalExpr>, ExecutionError> {
+        let expr = extract_expr!(spark_expr, LambdaVariable);
+        let data_type = to_arrow_datatype(expr.datatype.as_ref().unwrap());
+        Ok(Arc::new(LambdaVariableExpr::new(data_type)))
+    }
+}

native/core/src/execution/expressions/mod.rs

@@ -18,6 +18,7 @@
 //! Native DataFusion expressions
 
 pub mod arithmetic;
+pub mod array;
 pub mod bitwise;
 pub mod comparison;
 pub mod logical;

native/core/src/execution/planner/expression_registry.rs

@@ -103,6 +103,8 @@ pub enum ExpressionType {
     Randn,
     SparkPartitionId,
     MonotonicallyIncreasingId,
+    ArrayExists,
+    LambdaVariable,
 
     // Time functions
     Hour,
@@ -185,6 +187,9 @@ impl ExpressionRegistry {
         // Register temporal expressions
         self.register_temporal_expressions();
 
+        // Register array expressions
+        self.register_array_expressions();
+
         // Register random expressions
         self.register_random_expressions();
 
@@ -312,6 +317,18 @@ impl ExpressionRegistry {
         );
     }
 
+    /// Register array expression builders
+    fn register_array_expressions(&mut self) {
+        use crate::execution::expressions::array::*;
+
+        self.builders
+            .insert(ExpressionType::ArrayExists, Box::new(ArrayExistsBuilder));
+        self.builders.insert(
+            ExpressionType::LambdaVariable,
+            Box::new(LambdaVariableBuilder),
+        );
+    }
+
     /// Extract expression type from Spark protobuf expression
     fn get_expression_type(spark_expr: &Expr) -> Result<ExpressionType, ExecutionError> {
         match spark_expr.expr_struct.as_ref() {
@@ -376,6 +393,8 @@ impl ExpressionRegistry {
             Some(ExprStruct::MonotonicallyIncreasingId(_)) => {
                 Ok(ExpressionType::MonotonicallyIncreasingId)
             }
+            Some(ExprStruct::ArrayExists(_)) => Ok(ExpressionType::ArrayExists),
+            Some(ExprStruct::LambdaVariable(_)) => Ok(ExpressionType::LambdaVariable),
 
             Some(ExprStruct::Hour(_)) => Ok(ExpressionType::Hour),
             Some(ExprStruct::Minute(_)) => Ok(ExpressionType::Minute),

native/proto/src/proto/expr.proto

@@ -88,6 +88,8 @@ message Expr {
     UnixTimestamp unix_timestamp = 65;
     FromJson from_json = 66;
     ToCsv to_csv = 67;
+    ArrayExists array_exists = 68;
+    LambdaVariable lambda_variable = 69;
   }
 
   // Optional QueryContext for error reporting (contains SQL text and position)
@@ -484,3 +486,17 @@ message ArrayJoin {
 message Rand {
   int64 seed = 1;
 }
+
+message ArrayExists {
+  Expr array = 1;
+  Expr lambda_body = 2;
+  bool follow_three_valued_logic = 3;
+}
+
+// Currently only supports a single lambda variable per expression. The variable
+// is resolved by column index (always the last column in the expanded batch
+// constructed by ArrayExistsExpr). Extending to multi-argument lambdas
+// (e.g. transform(array, (x, i) -> ...)) would require adding an identifier.
+message LambdaVariable {
+  DataType datatype = 1;
+}