Type inference unittesting.

integration_tests/psql_combine2_test.l

@@ -0,0 +1,21 @@
+#
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+@Engine("psql"); 
+
+T({t: 1, r: 3});
+T({t: 2, r: 4});
+
+Test({a:1, dr: 2 * r}) = {b:2, c: d} :- d List= ({z: 2*i + t} :- i in Range(3)), T({t:, r:});

integration_tests/psql_combine2_test.txt

@@ -0,0 +1,6 @@
+ col0  |    logica_value     
+-------+---------------------
+ (1,6) | (2,"{(1),(3),(5)}")
+ (1,8) | (2,"{(2),(4),(6)}")
+(2 rows)
+

integration_tests/run_tests.py

@@ -93,6 +93,7 @@ def RunAll(test_presto=False, test_trino=False):
   RunTest("psql_purchase2_test")
   RunTest("psql_purchase3_test")
   RunTest("psql_combine_test")
+  RunTest("psql_combine2_test")
   RunTest("psql_record_combine_test")
   RunTest("psql_structs_ground_test")
   RunTest("psql_simple_structs_test")