[GitHub] [arrow-datafusion] viirya commented on a diff in pull request #2587: Evaluate JIT'd expression over arrays

[GitBox <gi...@apache.org>]

viirya commented on code in PR #2587:
URL: https://github.com/apache/arrow-datafusion/pull/2587#discussion_r879851451


##########
datafusion/jit/src/compile.rs:
##########
@@ -0,0 +1,184 @@
+// 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.
+
+//! Compile DataFusion Expr to JIT'd function.
+
+use datafusion_common::Result;
+
+use crate::api::Assembler;
+use crate::{
+    api::GeneratedFunction,
+    ast::{Expr as JITExpr, I64, PTR_SIZE},
+};
+
+/// Wrap JIT Expr to array compute function.
+pub fn build_calc_fn(
+    assembler: &Assembler,
+    jit_expr: JITExpr,
+    input_names: Vec<String>,
+) -> Result<GeneratedFunction> {
+    let mut builder = assembler.new_func_builder("calc_fn");
+    for input in &input_names {
+        builder = builder.param(format!("{}_array", input), I64);
+    }
+    let mut builder = builder.param("result", I64).param("len", I64);
+
+    let mut fn_body = builder.enter_block();
+    fn_body.declare_as("index", fn_body.lit_i(0))?;
+    fn_body.while_block(
+        |cond| cond.lt(cond.id("index")?, cond.id("len")?),
+        |w| {
+            w.declare_as("offset", w.mul(w.id("index")?, w.lit_i(PTR_SIZE as i64))?)?;
+            for input in &input_names {
+                w.declare_as(
+                    format!("{}_ptr", input),
+                    w.add(w.id(format!("{}_array", input))?, w.id("offset")?)?,
+                )?;
+                w.declare_as(input, w.deref(w.id(format!("{}_ptr", input))?, I64)?)?;

Review Comment:
   Hmm, so the generated func only accepts i64 arrays?



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