diff --git a/src/query/functions/src/scalars/array.rs b/src/query/functions/src/scalars/array.rs
index 6d9366c4ddd5c..d7032ec78661e 100644
--- a/src/query/functions/src/scalars/array.rs
+++ b/src/query/functions/src/scalars/array.rs
@@ -98,7 +98,7 @@ const ARRAY_SORT_FUNCTIONS: &[(&str, (bool, bool)); 4] = &[
 pub fn register(registry: &mut FunctionRegistry) {
     registry.register_aliases("contains", &["array_contains"]);
     registry.register_aliases("get", &["array_get"]);
-    registry.register_aliases("length", &["array_length"]);
+    registry.register_aliases("length", &["array_length", "array_size"]);
     registry.register_aliases("slice", &["array_slice"]);
 
     register_array_aggr(registry);
diff --git a/src/query/functions/tests/it/scalars/array.rs b/src/query/functions/tests/it/scalars/array.rs
index edc1c8c3093da..78a4b6e2f714f 100644
--- a/src/query/functions/tests/it/scalars/array.rs
+++ b/src/query/functions/tests/it/scalars/array.rs
@@ -73,6 +73,7 @@ fn test_length(file: &mut impl Write) {
     run_ast(file, "length([1, 2, 3])", &[]);
     run_ast(file, "length([true, false])", &[]);
     run_ast(file, "length(['a', 'b', 'c', 'd'])", &[]);
+    run_ast(file, "array_size(['a', 'b', 'c', 'd'])", &[]);
 }
 
 fn test_range(file: &mut impl Write) {
diff --git a/src/query/functions/tests/it/scalars/testdata/array.txt b/src/query/functions/tests/it/scalars/testdata/array.txt
index 2d8f5c79ff65a..de01d23bbda8c 100644
--- a/src/query/functions/tests/it/scalars/testdata/array.txt
+++ b/src/query/functions/tests/it/scalars/testdata/array.txt
@@ -100,6 +100,15 @@ output domain  : {4..=4}
 output         : 4
 
 
+ast            : array_size(['a', 'b', 'c', 'd'])
+raw expr       : array_size(array('a', 'b', 'c', 'd'))
+checked expr   : length<T0=String><Array(T0)>(array<T0=String><T0, T0, T0, T0>("a", "b", "c", "d"))
+optimized expr : 4_u64
+output type    : UInt64
+output domain  : {4..=4}
+output         : 4
+
+
 ast            : range(10, 20)
 raw expr       : range(10, 20)
 checked expr   : range<UInt64, UInt64>(to_uint64<UInt8>(10_u8), to_uint64<UInt8>(20_u8))
diff --git a/src/query/functions/tests/it/scalars/testdata/function_list.txt b/src/query/functions/tests/it/scalars/testdata/function_list.txt
index d14e8fd8697c4..508e13be229a4 100644
--- a/src/query/functions/tests/it/scalars/testdata/function_list.txt
+++ b/src/query/functions/tests/it/scalars/testdata/function_list.txt
@@ -3,6 +3,7 @@ add -> plus
 array_contains -> contains
 array_get -> get
 array_length -> length
+array_size -> length
 array_slice -> slice
 bitmap_and_not -> bitmap_not
 bitmap_cardinality -> bitmap_count