diff --git a/pkg/sql/logictest/testdata/logic_test/srfs b/pkg/sql/logictest/testdata/logic_test/srfs
index 00d75035c9de..7fd790ba9341 100644
--- a/pkg/sql/logictest/testdata/logic_test/srfs
+++ b/pkg/sql/logictest/testdata/logic_test/srfs
@@ -1422,3 +1422,47 @@ NULL
 NULL
 4
 5
+
+# Regression test for #110952 - providing invalid arguments to unnest should
+# not trigger an internal error.
+statement error pgcode 42804 pq: could not determine polymorphic type: unnest\(string\)
+SELECT unnest('{}');
+
+statement error pgcode 42804 pq: could not determine polymorphic type: unnest\(string, string, string\)
+SELECT unnest('{}', '{}', '{}');
+
+statement error pgcode 42883 pq: unknown signature: unnest\(int\)
+SELECT unnest(1);
+
+statement error pgcode 42883 pq: unknown signature: unnest\(int, int, int\)
+SELECT unnest(1, 2, 3);
+
+statement error pgcode 42804 pq: could not determine polymorphic type: unnest\(unknown\)
+SELECT unnest(NULL);
+
+statement error pgcode 42804 pq: could not determine polymorphic type: unnest\(unknown, unknown, unknown\)
+SELECT unnest(NULL, NULL, NULL);
+
+# pg_expandarray handles return types similarly to unnest.
+statement error pgcode 42804 pq: could not determine polymorphic type: information_schema._pg_expandarray\(string\)
+SELECT information_schema._pg_expandarray('{}');
+
+query T
+SELECT unnest('{1}'::int[], '{2}', '{3}');
+----
+(1,2,3)
+
+query T
+SELECT unnest('{1}'::int[], '{}', '{}');
+----
+(1,,)
+
+query T
+SELECT unnest('{1}', '{2}', '{3}'::int[]);
+----
+(1,2,3)
+
+query T
+SELECT unnest('{}', '{}', '{3}'::int[]);
+----
+(,,3)
diff --git a/pkg/sql/sem/builtins/generator_builtins.go b/pkg/sql/sem/builtins/generator_builtins.go
index 0477eedb7bbe..11f088d61ce3 100644
--- a/pkg/sql/sem/builtins/generator_builtins.go
+++ b/pkg/sql/sem/builtins/generator_builtins.go
@@ -299,7 +299,7 @@ var generators = map[string]builtinDefinition{
 		makeGeneratorOverloadWithReturnType(
 			tree.ParamTypes{{Name: "input", Typ: types.AnyArray}},
 			func(args []tree.TypedExpr) *types.T {
-				if len(args) == 0 || args[0].ResolvedType().Family() == types.UnknownFamily {
+				if len(args) == 0 || args[0].ResolvedType().Family() != types.ArrayFamily {
 					return tree.UnknownReturnType
 				}
 				return args[0].ResolvedType().ArrayContents()
@@ -319,7 +319,7 @@ var generators = map[string]builtinDefinition{
 				returnTypes := make([]*types.T, len(args))
 				labels := make([]string, len(args))
 				for i, arg := range args {
-					if arg.ResolvedType().Family() == types.UnknownFamily {
+					if arg.ResolvedType().Family() != types.ArrayFamily {
 						return tree.UnknownReturnType
 					}
 					returnTypes[i] = arg.ResolvedType().ArrayContents()
@@ -337,7 +337,7 @@ var generators = map[string]builtinDefinition{
 		makeGeneratorOverloadWithReturnType(
 			tree.ParamTypes{{Name: "input", Typ: types.AnyArray}},
 			func(args []tree.TypedExpr) *types.T {
-				if len(args) == 0 || args[0].ResolvedType().Family() == types.UnknownFamily {
+				if len(args) == 0 || args[0].ResolvedType().Family() != types.ArrayFamily {
 					return tree.UnknownReturnType
 				}
 				t := args[0].ResolvedType().ArrayContents()