diff --git a/pkg/sql/logictest/testdata/logic_test/builtin_function b/pkg/sql/logictest/testdata/logic_test/builtin_function
index dc06c78dfa91..0eb4228ee680 100644
--- a/pkg/sql/logictest/testdata/logic_test/builtin_function
+++ b/pkg/sql/logictest/testdata/logic_test/builtin_function
@@ -2480,6 +2480,18 @@ SELECT array_to_string(NULL, ','), array_to_string(NULL, 'foo', 'zerp')
 ----
 NULL  NULL
 
+# Builtin array_to_string should recursively search nested arrays.
+query T
+SELECT array_to_string(ARRAY[ARRAY[ARRAY[5,6], ARRAY[2,3]], ARRAY[ARRAY[7,8], ARRAY[4,44]]], ' ');
+----
+5 6 2 3 7 8 4 44
+
+# Builtin array_to_string should recursively search nested arrays.
+query T
+SELECT array_to_string(ARRAY[(SELECT ARRAY[1,2]::int2vector)],' ');
+----
+1 2
+
 subtest pg_is_in_recovery
 
 query B colnames
diff --git a/pkg/sql/sem/builtins/builtins.go b/pkg/sql/sem/builtins/builtins.go
index d2f127430f32..6c1d813fa566 100644
--- a/pkg/sql/sem/builtins/builtins.go
+++ b/pkg/sql/sem/builtins/builtins.go
@@ -8976,6 +8976,13 @@ func arrayToString(
 	evalCtx *tree.EvalContext, arr *tree.DArray, delim string, nullStr *string,
 ) (tree.Datum, error) {
 	f := evalCtx.FmtCtx(tree.FmtArrayToString)
+	arrayToStringHelper(evalCtx, arr, delim, nullStr, f)
+	return tree.NewDString(f.CloseAndGetString()), nil
+}
+
+func arrayToStringHelper(
+	evalCtx *tree.EvalContext, arr *tree.DArray, delim string, nullStr *string, f *tree.FmtCtx,
+) {
 
 	for i := range arr.Array {
 		if arr.Array[i] == tree.DNull {
@@ -8984,13 +8991,17 @@ func arrayToString(
 			}
 			f.WriteString(*nullStr)
 		} else {
-			f.FormatNode(arr.Array[i])
+			if nestedArray, ok := arr.Array[i].(*tree.DArray); ok {
+				// "Unpack" nested arrays to be consistent with postgres.
+				arrayToStringHelper(evalCtx, nestedArray, delim, nullStr, f)
+			} else {
+				f.FormatNode(arr.Array[i])
+			}
 		}
 		if i < len(arr.Array)-1 {
 			f.WriteString(delim)
 		}
 	}
-	return tree.NewDString(f.CloseAndGetString()), nil
 }
 
 // encodeEscape implements the encode(..., 'escape') Postgres builtin. It's