From c31d1d8b49a85f203692d4bb9e08f9af9f3918e9 Mon Sep 17 00:00:00 2001
From: Runji Wang <wangrunji0408@163.com>
Date: Thu, 30 May 2024 21:48:27 +0800
Subject: [PATCH] fix table function with no argument

Signed-off-by: Runji Wang <wangrunji0408@163.com>
---
 src/expr/core/src/codegen.rs |  3 ++-
 src/expr/macro/src/gen.rs    | 19 ++++++++-----------
 2 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/src/expr/core/src/codegen.rs b/src/expr/core/src/codegen.rs
index c9022e40aec91..e944f43950fdc 100644
--- a/src/expr/core/src/codegen.rs
+++ b/src/expr/core/src/codegen.rs
@@ -12,8 +12,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+//! This module contains imports that are used in the generated code for the `#[function]` macro.
+
 pub use async_trait::async_trait;
 pub use futures_async_stream::try_stream;
 pub use futures_util::stream::BoxStream;
-pub use itertools::multizip;
 pub use linkme;
diff --git a/src/expr/macro/src/gen.rs b/src/expr/macro/src/gen.rs
index 1185df8a194b0..7174b3adf29ed 100644
--- a/src/expr/macro/src/gen.rs
+++ b/src/expr/macro/src/gen.rs
@@ -484,10 +484,6 @@ impl FunctionAttr {
             }
         } else {
             // no optimization
-            let array_zip = match children_indices.len() {
-                0 => quote! { std::iter::repeat(()).take(input.capacity()) },
-                _ => quote! { multizip((#(#arrays.iter(),)*)) },
-            };
             let let_variadic = variadic.then(|| {
                 quote! {
                     let variadic_row = variadic_input.row_at_unchecked_vis(i);
@@ -497,18 +493,18 @@ impl FunctionAttr {
                 let mut builder = #builder_type::with_type(input.capacity(), self.context.return_type.clone());
 
                 if input.is_compacted() {
-                    for (i, (#(#inputs,)*)) in #array_zip.enumerate() {
+                    for i in 0..input.capacity() {
+                        #(let #inputs = unsafe { #arrays.value_at_unchecked(i) };)*
                         #let_variadic
                         #append_output
                     }
                 } else {
-                    // allow using `zip` for performance
-                    #[allow(clippy::disallowed_methods)]
-                    for (i, ((#(#inputs,)*), visible)) in #array_zip.zip(input.visibility().iter()).enumerate() {
-                        if !visible {
+                    for i in 0..input.capacity() {
+                        if unsafe { !input.visibility().is_set_unchecked(i) } {
                             builder.append_null();
                             continue;
                         }
+                        #(let #inputs = unsafe { #arrays.value_at_unchecked(i) };)*
                         #let_variadic
                         #append_output
                     }
@@ -1179,10 +1175,11 @@ impl FunctionAttr {
                         let mut index_builder = I32ArrayBuilder::new(self.chunk_size);
                         #(let mut #builders = #builder_types::with_type(self.chunk_size, #return_types);)*
 
-                        for (i, ((#(#inputs,)*), visible)) in multizip((#(#arrays.iter(),)*)).zip_eq_fast(input.visibility().iter()).enumerate() {
-                            if !visible {
+                        for i in 0..input.capacity() {
+                            if unsafe { !input.visibility().is_set_unchecked(i) } {
                                 continue;
                             }
+                            #(let #inputs = unsafe { #arrays.value_at_unchecked(i) };)*
                             for output in #iter {
                                 index_builder.append(Some(i as i32));
                                 match #output {