Avoid unnecessary branching in row read/write if schema is null-free

datafusion/benches/jit.rs

@@ -23,9 +23,7 @@ extern crate datafusion;
 mod data_utils;
 use crate::criterion::Criterion;
 use crate::data_utils::{create_record_batches, create_schema};
-use datafusion::row::writer::{
-    bench_write_batch, bench_write_batch_jit, bench_write_batch_jit_dummy,
-};
+use datafusion::row::writer::{bench_write_batch, bench_write_batch_jit};
 use std::sync::Arc;
 
 fn criterion_benchmark(c: &mut Criterion) {
@@ -48,10 +46,6 @@ fn criterion_benchmark(c: &mut Criterion) {
             criterion::black_box(bench_write_batch_jit(&batches, schema.clone()).unwrap())
         })
     });
-
-    c.bench_function("row serializer jit codegen only", |b| {
-        b.iter(|| bench_write_batch_jit_dummy(schema.clone()).unwrap())
-    });
 }
 
 criterion_group!(benches, criterion_benchmark);

datafusion/src/row/mod.rs

@@ -212,6 +212,11 @@ fn fn_name<T>(f: T) -> &'static str {
     }
 }
 
+/// Tell if schema contains no nullable field
+pub fn schema_null_free(schema: &Arc<Schema>) -> bool {
+    schema.fields().iter().all(|f| !f.is_nullable())
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -323,7 +328,7 @@ mod tests {
                 #[test]
                 #[allow(non_snake_case)]
                 fn [<test_single_ $TYPE>]() -> Result<()> {
-                    let schema = Arc::new(Schema::new(vec![Field::new("a", $TYPE, false)]));
+                    let schema = Arc::new(Schema::new(vec![Field::new("a", $TYPE, true)]));
                     let a = $ARRAY::from($VEC);
                     let batch = RecordBatch::try_new(schema.clone(), vec![Arc::new(a)])?;
                     let mut vector = vec![0; 1024];
@@ -349,6 +354,38 @@ mod tests {
                     assert_eq!(batch, output_batch);
                     Ok(())
                 }
+
+                #[test]
+                #[allow(non_snake_case)]
+                fn [<test_single_ $TYPE _null_free>]() -> Result<()> {
+                    let schema = Arc::new(Schema::new(vec![Field::new("a", $TYPE, false)]));
+                    let v = $VEC.into_iter().filter(|o| o.is_some()).collect::<Vec<_>>();
+                    let a = $ARRAY::from(v);
+                    let batch = RecordBatch::try_new(schema.clone(), vec![Arc::new(a)])?;
+                    let mut vector = vec![0; 1024];
+                    let row_offsets =
+                        { write_batch_unchecked(&mut vector, 0, &batch, 0, schema.clone()) };
+                    let output_batch = { read_as_batch(&vector, schema, row_offsets)? };
+                    assert_eq!(batch, output_batch);
+                    Ok(())
+                }
+
+                #[test]
+                #[allow(non_snake_case)]
+                #[cfg(feature = "jit")]
+                fn [<test_single_ $TYPE _jit_null_free>]() -> Result<()> {
+                    let schema = Arc::new(Schema::new(vec![Field::new("a", $TYPE, false)]));
+                    let v = $VEC.into_iter().filter(|o| o.is_some()).collect::<Vec<_>>();
+                    let a = $ARRAY::from(v);
+                    let batch = RecordBatch::try_new(schema.clone(), vec![Arc::new(a)])?;
+                    let mut vector = vec![0; 1024];
+                    let assembler = Assembler::default();
+                    let row_offsets =
+                        { write_batch_unchecked_jit(&mut vector, 0, &batch, 0, schema.clone(), &assembler)? };
+                    let output_batch = { read_as_batch_jit(&vector, schema, row_offsets, &assembler)? };
+                    assert_eq!(batch, output_batch);
+                    Ok(())
+                }
             }
         };
     }
@@ -439,7 +476,7 @@ mod tests {
 
     #[test]
     fn test_single_binary() -> Result<()> {
-        let schema = Arc::new(Schema::new(vec![Field::new("a", Binary, false)]));
+        let schema = Arc::new(Schema::new(vec![Field::new("a", Binary, true)]));
         let values: Vec<Option<&[u8]>> =
             vec![Some(b"one"), Some(b"two"), None, Some(b""), Some(b"three")];
         let a = BinaryArray::from_opt_vec(values);
@@ -478,6 +515,45 @@ mod tests {
         Ok(())
     }
 
+    #[test]
+    fn test_single_binary_null_free() -> Result<()> {
+        let schema = Arc::new(Schema::new(vec![Field::new("a", Binary, false)]));
+        let values: Vec<&[u8]> = vec![b"one", b"two", b"", b"three"];
+        let a = BinaryArray::from_vec(values);
+        let batch = RecordBatch::try_new(schema.clone(), vec![Arc::new(a)])?;
+        let mut vector = vec![0; 8192];
+        let row_offsets =
+            { write_batch_unchecked(&mut vector, 0, &batch, 0, schema.clone()) };
+        let output_batch = { read_as_batch(&vector, schema, row_offsets)? };
+        assert_eq!(batch, output_batch);
+        Ok(())
+    }
+
+    #[test]
+    #[cfg(feature = "jit")]
+    fn test_single_binary_jit_null_free() -> Result<()> {
+        let schema = Arc::new(Schema::new(vec![Field::new("a", Binary, false)]));
+        let values: Vec<&[u8]> = vec![b"one", b"two", b"", b"three"];
+        let a = BinaryArray::from_vec(values);
+        let batch = RecordBatch::try_new(schema.clone(), vec![Arc::new(a)])?;
+        let mut vector = vec![0; 8192];
+        let assembler = Assembler::default();
+        let row_offsets = {
+            write_batch_unchecked_jit(
+                &mut vector,
+                0,
+                &batch,
+                0,
+                schema.clone(),
+                &assembler,
+            )?
+        };
+        let output_batch =
+            { read_as_batch_jit(&vector, schema, row_offsets, &assembler)? };
+        assert_eq!(batch, output_batch);
+        Ok(())
+    }
+
     #[tokio::test]
     async fn test_with_parquet() -> Result<()> {
         let runtime = Arc::new(RuntimeEnv::default());

datafusion/src/row/reader.rs

@@ -22,7 +22,9 @@ use crate::error::{DataFusionError, Result};
 use crate::reg_fn;
 #[cfg(feature = "jit")]
 use crate::row::fn_name;
-use crate::row::{all_valid, get_offsets, supported, NullBitsFormatter};
+use crate::row::{
+    all_valid, get_offsets, schema_null_free, supported, NullBitsFormatter,
+};
 use arrow::array::*;
 use arrow::datatypes::{DataType, Schema};
 use arrow::error::Result as ArrowResult;
@@ -133,32 +135,40 @@ pub struct RowReader<'a> {
     /// For fixed length fields, it's where the actual data stores.
     /// For variable length fields, it's a pack of (offset << 32 | length) if we use u64.
     field_offsets: Vec<usize>,
+    /// If a row is null free according to its schema
+    null_free: bool,
 }
 
 impl<'a> std::fmt::Debug for RowReader<'a> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        let null_bits = self.null_bits();
-        write!(
-            f,
-            "{:?}",
-            NullBitsFormatter::new(null_bits, self.field_count)
-        )
+        if self.null_free {
+            write!(f, "null_free")
+        } else {
+            let null_bits = self.null_bits();
+            write!(
+                f,
+                "{:?}",
+                NullBitsFormatter::new(null_bits, self.field_count)
+            )
+        }
     }
 }
 
 impl<'a> RowReader<'a> {
     /// new
     pub fn new(schema: &Arc<Schema>, data: &'a [u8]) -> Self {
         assert!(supported(schema));
+        let null_free = schema_null_free(schema);
         let field_count = schema.fields().len();
-        let null_width = ceil(field_count, 8);
+        let null_width = if null_free { 0 } else { ceil(field_count, 8) };
         let (field_offsets, _) = get_offsets(null_width, schema);
         Self {
             data,
             base_offset: 0,
             field_count,
             null_width,
             field_offsets,
+            null_free,
         }
     }
 
@@ -174,14 +184,22 @@ impl<'a> RowReader<'a> {
 
     #[inline(always)]
     fn null_bits(&self) -> &[u8] {
-        let start = self.base_offset;
-        &self.data[start..start + self.null_width]
+        if self.null_free {
+            &[]
+        } else {
+            let start = self.base_offset;
+            &self.data[start..start + self.null_width]
+        }
     }
 
     #[inline(always)]
     fn all_valid(&self) -> bool {
-        let null_bits = self.null_bits();
-        all_valid(null_bits, self.field_count)
+        if self.null_free {
+            true
+        } else {
+            let null_bits = self.null_bits();
+            all_valid(null_bits, self.field_count)
+        }
     }
 
     fn is_valid_at(&self, idx: usize) -> bool {
@@ -276,7 +294,7 @@ impl<'a> RowReader<'a> {
 }
 
 fn read_row(row: &RowReader, batch: &mut MutableRecordBatch, schema: &Arc<Schema>) {
-    if row.all_valid() {
+    if row.null_free || row.all_valid() {
         for ((col_idx, to), field) in batch
             .arrays
             .iter_mut()
@@ -325,21 +343,21 @@ fn register_read_functions(asm: &Assembler) -> Result<()> {
     reg_fn!(asm, read_field_date64, reader_param.clone(), None);
     reg_fn!(asm, read_field_utf8, reader_param.clone(), None);
     reg_fn!(asm, read_field_binary, reader_param.clone(), None);
-    reg_fn!(asm, read_field_bool_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_u8_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_u16_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_u32_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_u64_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_i8_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_i16_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_i32_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_i64_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_f32_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_f64_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_date32_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_date64_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_utf8_nf, reader_param.clone(), None);
-    reg_fn!(asm, read_field_binary_nf, reader_param, None);
+    reg_fn!(asm, read_field_bool_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_u8_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_u16_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_u32_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_u64_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_i8_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_i16_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_i32_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_i64_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_f32_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_f64_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_date32_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_date64_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_utf8_null_free, reader_param.clone(), None);
+    reg_fn!(asm, read_field_binary_null_free, reader_param, None);
     Ok(())
 }
 
@@ -383,21 +401,21 @@ fn gen_read_row(
             }
         } else {
             match dt {
-                Boolean => b.call_stmt("read_field_bool_nf", params)?,
-                UInt8 => b.call_stmt("read_field_u8_nf", params)?,
-                UInt16 => b.call_stmt("read_field_u16_nf", params)?,
-                UInt32 => b.call_stmt("read_field_u32_nf", params)?,
-                UInt64 => b.call_stmt("read_field_u64_nf", params)?,
-                Int8 => b.call_stmt("read_field_i8_nf", params)?,
-                Int16 => b.call_stmt("read_field_i16_nf", params)?,
-                Int32 => b.call_stmt("read_field_i32_nf", params)?,
-                Int64 => b.call_stmt("read_field_i64_nf", params)?,
-                Float32 => b.call_stmt("read_field_f32_nf", params)?,
-                Float64 => b.call_stmt("read_field_f64_nf", params)?,
-                Date32 => b.call_stmt("read_field_date32_nf", params)?,
-                Date64 => b.call_stmt("read_field_date64_nf", params)?,
-                Utf8 => b.call_stmt("read_field_utf8_nf", params)?,
-                Binary => b.call_stmt("read_field_binary_nf", params)?,
+                Boolean => b.call_stmt("read_field_bool_null_free", params)?,
+                UInt8 => b.call_stmt("read_field_u8_null_free", params)?,
+                UInt16 => b.call_stmt("read_field_u16_null_free", params)?,
+                UInt32 => b.call_stmt("read_field_u32_null_free", params)?,
+                UInt64 => b.call_stmt("read_field_u64_null_free", params)?,
+                Int8 => b.call_stmt("read_field_i8_null_free", params)?,
+                Int16 => b.call_stmt("read_field_i16_null_free", params)?,
+                Int32 => b.call_stmt("read_field_i32_null_free", params)?,
+                Int64 => b.call_stmt("read_field_i64_null_free", params)?,
+                Float32 => b.call_stmt("read_field_f32_null_free", params)?,
+                Float64 => b.call_stmt("read_field_f64_null_free", params)?,
+                Date32 => b.call_stmt("read_field_date32_null_free", params)?,
+                Date64 => b.call_stmt("read_field_date64_null_free", params)?,
+                Utf8 => b.call_stmt("read_field_utf8_null_free", params)?,
+                Binary => b.call_stmt("read_field_binary_null_free", params)?,
                 _ => unimplemented!(),
             }
         }
@@ -418,7 +436,7 @@ macro_rules! fn_read_field {
                     .unwrap();
             }
 
-            fn [<read_field_ $NATIVE _nf>](to: &mut Box<dyn ArrayBuilder>, col_idx: usize, row: &RowReader) {
+            fn [<read_field_ $NATIVE _null_free>](to: &mut Box<dyn ArrayBuilder>, col_idx: usize, row: &RowReader) {
                 let to = to
                     .as_any_mut()
                     .downcast_mut::<$ARRAY>()
@@ -455,7 +473,11 @@ fn read_field_binary(to: &mut Box<dyn ArrayBuilder>, col_idx: usize, row: &RowRe
     }
 }
 
-fn read_field_binary_nf(to: &mut Box<dyn ArrayBuilder>, col_idx: usize, row: &RowReader) {
+fn read_field_binary_null_free(
+    to: &mut Box<dyn ArrayBuilder>,
+    col_idx: usize,
+    row: &RowReader,
+) {
     let to = to.as_any_mut().downcast_mut::<BinaryBuilder>().unwrap();
     to.append_value(row.get_binary(col_idx))
         .map_err(DataFusionError::ArrowError)
@@ -497,21 +519,21 @@ fn read_field_null_free(
 ) {
     use DataType::*;
     match dt {
-        Boolean => read_field_bool_nf(to, col_idx, row),
-        UInt8 => read_field_u8_nf(to, col_idx, row),
-        UInt16 => read_field_u16_nf(to, col_idx, row),
-        UInt32 => read_field_u32_nf(to, col_idx, row),
-        UInt64 => read_field_u64_nf(to, col_idx, row),
-        Int8 => read_field_i8_nf(to, col_idx, row),
-        Int16 => read_field_i16_nf(to, col_idx, row),
-        Int32 => read_field_i32_nf(to, col_idx, row),
-        Int64 => read_field_i64_nf(to, col_idx, row),
-        Float32 => read_field_f32_nf(to, col_idx, row),
-        Float64 => read_field_f64_nf(to, col_idx, row),
-        Date32 => read_field_date32_nf(to, col_idx, row),
-        Date64 => read_field_date64_nf(to, col_idx, row),
-        Utf8 => read_field_utf8_nf(to, col_idx, row),
-        Binary => read_field_binary_nf(to, col_idx, row),
+        Boolean => read_field_bool_null_free(to, col_idx, row),
+        UInt8 => read_field_u8_null_free(to, col_idx, row),
+        UInt16 => read_field_u16_null_free(to, col_idx, row),
+        UInt32 => read_field_u32_null_free(to, col_idx, row),
+        UInt64 => read_field_u64_null_free(to, col_idx, row),
+        Int8 => read_field_i8_null_free(to, col_idx, row),
+        Int16 => read_field_i16_null_free(to, col_idx, row),
+        Int32 => read_field_i32_null_free(to, col_idx, row),
+        Int64 => read_field_i64_null_free(to, col_idx, row),
+        Float32 => read_field_f32_null_free(to, col_idx, row),
+        Float64 => read_field_f64_null_free(to, col_idx, row),
+        Date32 => read_field_date32_null_free(to, col_idx, row),
+        Date64 => read_field_date64_null_free(to, col_idx, row),
+        Utf8 => read_field_utf8_null_free(to, col_idx, row),
+        Binary => read_field_binary_null_free(to, col_idx, row),
         _ => unimplemented!(),
     }
 }