PushdownSpec:
Predicates
- should not be pushed down
  + Given a table partitioned by partitionKey 
  + When we execute a query that concatenates strings based on partitionKey 
  + Then The query plan:
== Physical Plan ==
*(1) Filter (concat(2025-01-0, cast(partitionKey#1366L as string)) = 2025-01-02)
+- *(1) ColumnarToRow
   +- BatchScan polaris.my_namespace.PushdownSpec[id#1364, label#1365, partitionKey#1366L, date#1367, timestamp#1368] polaris.my_namespace.PushdownSpec (branch=null) [filters=, groupedBy=] RuntimeFilters: []



shows nothing has been pushed down 
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +  
- should be pushed down
  + Given the same table containing data that looks like:
			Datum(0,label_0,0,2025-03-28,2025-03-28 13:59:34.403)
			Datum(1,label_1,1,2025-03-27,2025-03-28 13:59:34.603)
			Datum(2,label_2,2,2025-03-26,2025-03-28 13:59:34.803)
			... 
  + When we execute a query that simply checks the equality of partitionKey 
  + Then the query plan:
== Physical Plan ==
*(1) Filter (isnotnull(partitionKey#1403L) AND (partitionKey#1403L = 1))
+- *(1) ColumnarToRow
   +- BatchScan polaris.my_namespace.PushdownSpec[id#1401, label#1402, partitionKey#1403L, date#1404, timestamp#1405] polaris.my_namespace.PushdownSpec (branch=null) [filters=partitionKey IS NOT NULL, partitionKey = 1, groupedBy=] RuntimeFilters: []


 
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