Wrap selected column in any_value to avoid subquery issue (#303)

Snowflake seems to not detect that these inner select queries are
returning scalar values without an aggregate.

Closes #301

bootstrap/018_warehouse_updates.sql

@@ -110,12 +110,13 @@ BEGIN
     CALL INTERNAL.SET_CONFIG('WAREHOUSE_EVENTS_MAINTENANCE', CURRENT_TIMESTAMP()::string);
 END;
 
-CREATE OR REPLACE FUNCTION TOOLS.APPROX_CREDITS_USED(warehouse_name varchar, start_time timestamp, end_time timestamp)
+CREATE OR REPLACE FUNCTION TOOLS.APPROX_CREDITS_USED(wh_name varchar, start_time timestamp, end_time timestamp)
 RETURNS NUMBER
 AS
 $$
-    TOOLS.WAREHOUSE_CREDITS_PER_MILLI((select warehouse_size from internal.warehouse_size_mapping t where t.warehouse_name = warehouse_name),
-    coalesce((select warehouse_type from internal.warehouse_size_mapping t where t.warehouse_name = warehouse_name), 'STANDARD'))*timestampdiff(millisecond, start_time, end_time)
+    TOOLS.WAREHOUSE_CREDITS_PER_MILLI(
+        (select any_value(warehouse_size) from internal.warehouse_size_mapping t where t.warehouse_name = wh_name),
+        coalesce((select any_value(warehouse_type) from internal.warehouse_size_mapping t where t.warehouse_name = wh_name), 'STANDARD'))*timestampdiff(millisecond, start_time, end_time)
 $$;
 
 CREATE OR REPLACE FUNCTION TOOLS.APPROX_CREDITS_USED(warehouse_name varchar, start_time timestamp)

bootstrap/090_post_setup.sql

@@ -179,7 +179,7 @@ Query Text: {bt}{bt}{bt}{query_text}{bt}{bt}{bt}
 EXCEPTION
    WHEN OTHER THEN
        SYSTEM$LOG_ERROR(OBJECT_CONSTRUCT('error', 'Unhandled exception occurred during probe monitoring.', 'SQLCODE', :sqlcode, 'SQLERRM', :sqlerrm, 'SQLSTATE', :sqlstate));
-       insert into internal.probe_actions select CURRENT_TIMESTAMP(), '', '', null::VARIANT, 'Caught unhandled exception';
+       insert into internal.probe_actions select CURRENT_TIMESTAMP(), '', '', null::VARIANT, 'Caught unhandled exception: ' || :sqlerrm;
        RAISE;
 END;