infer: Make sure SQL tests pass on Snowflake, too

src/scope.rs

@@ -256,6 +256,7 @@ GENERATE_DATE_ARRAY = Fn(DATE, DATE, INTERVAL) -> ARRAY<DATE>;
 GENERATE_UUID = Fn() -> STRING;
 GREATEST = Fn<?T>(?T, ..?T) -> ?T;
 LAG = FnOver<?T>(Agg<?T>) -> ?T;
+LAST_VALUE = FnOver<?T>(Agg<?T>) -> ?T;
 LEAST = Fn<?T>(?T, ..?T) -> ?T;
 LENGTH = Fn(STRING) -> INT64 | Fn(BYTES) -> INT64;
 LOWER = Fn(STRING) -> STRING;

tests/sql/functions/aggregate/ansi.sql

@@ -1,3 +1,5 @@
+-- pending: snowflake Need to force AVG(INT64|FLOAT64) to return FLOAT64, not DECIMAL
+--
 -- ANSI standard aggregate functions: AVG, COUNT, MAX, MIN, SUM
 
 CREATE TEMP TABLE ints (i INT64);

tests/sql/functions/simple/strings.sql

@@ -1,23 +1,23 @@
--- pending: trino CONCAT doesn't coerce other types to STRING.
---
 -- LOWER, UPPER, TRIM, CONCAT
 CREATE OR REPLACE TABLE __result1 AS
 SELECT
     LOWER('FOO') AS lower,
     UPPER('foo') AS upper,
     TRIM('  foo  ') AS trimmed,
     CONCAT('foo', 'bar') AS concat,
-    CONCAT('x', 1) concat_casted,
+    -- We have decided not to support this for now, because it requires casting
+    -- all types _except_ BINARY.
+    --
+    -- CONCAT('x', 1) concat_casted,
     CONCAT('x', NULL) concat_null;
 
 CREATE OR REPLACE TABLE __expected1 (
     lower STRING,
     upper STRING,
     trimmed STRING,
     concat STRING,
-    concat_casted STRING,
     concat_null STRING,
 );
 INSERT INTO __expected1 VALUES
-  ('foo', 'FOO', 'foo', 'foobar', 'x1', NULL);
+  ('foo', 'FOO', 'foo', 'foobar', NULL);