uros-db commented on code in PR #45216:
URL: https://github.com/apache/spark/pull/45216#discussion_r1505460392


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common/unsafe/src/main/java/org/apache/spark/sql/catalyst/util/CollationFactory.java:
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@@ -105,6 +105,9 @@ public Collation(
   private static final Collation[] collationTable = new Collation[4];
   private static final HashMap<String, Integer> collationNameToIdMap = new 
HashMap<>();
 
+  public static final int DEFAULT_COLLATION_ID = 0;
+  public static final int LOWERCASE_COLLATION_ID = 1;

Review Comment:
   for now, `DEFAULT_COLLATION_ID ` is mostly used outside of CollationFactory 
(e.g. StringType, ColumnType, PhysicalDataType), so there's not too many places 
where a "0" is hardcoded instead
   
   while I suppose we could also do `collationTable[DEFAULT_COLLATION_ID] = 
...`, it wouldn't really make too much sense as only `0` and `1` are special 
cases (while `2`, `3`, and so on are not), and I also suppose collationTable 
initialization itself will evolve soon with respect to other collation types so 
it hardly matters
   
   that said, I could change it for now?



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