test: check record count and types in paqruet window test

datafusion/sqllogictest/test_files/parquet.slt

@@ -251,25 +251,21 @@ SELECT COUNT(*) FROM timestamp_with_tz;
 ----
 131072
 
-# Perform the query:
-query IPT
-SELECT
-  count,
-  LAG(timestamp, 1) OVER (ORDER BY timestamp),
-  arrow_typeof(LAG(timestamp, 1) OVER (ORDER BY timestamp))
-FROM timestamp_with_tz
-LIMIT 10;
+# Perform the query asserting that output timestamp columns will contain TZ
+# and output record count will match input file record count
+query TPI
+SELECT arrow_typeof(lag_timestamp),
+       MIN(lag_timestamp),
+       COUNT(1)
+FROM (
+  SELECT
+    count,
+    LAG(timestamp, 1) OVER (ORDER BY timestamp) AS lag_timestamp
+  FROM timestamp_with_tz
+) t
+GROUP BY 1
 ----
-0 NULL Timestamp(Millisecond, Some("UTC"))
-0 2014-08-27T14:00:00Z Timestamp(Millisecond, Some("UTC"))
-0 2014-08-27T14:00:00Z Timestamp(Millisecond, Some("UTC"))
-4 2014-08-27T14:00:00Z Timestamp(Millisecond, Some("UTC"))
-0 2014-08-27T14:00:00Z Timestamp(Millisecond, Some("UTC"))
-0 2014-08-27T14:00:00Z Timestamp(Millisecond, Some("UTC"))
-0 2014-08-27T14:00:00Z Timestamp(Millisecond, Some("UTC"))
-14 2014-08-27T14:00:00Z Timestamp(Millisecond, Some("UTC"))
-0 2014-08-27T14:00:00Z Timestamp(Millisecond, Some("UTC"))
-0 2014-08-27T14:00:00Z Timestamp(Millisecond, Some("UTC"))
+Timestamp(Millisecond, Some("UTC")) 2014-08-27T14:00:00Z 131072
 
 # Test config listing_table_ignore_subdirectory: