marton-bod commented on a change in pull request #2418:
URL: https://github.com/apache/hive/pull/2418#discussion_r663975836
##########
File path:
iceberg/iceberg-catalog/src/main/java/org/apache/iceberg/hive/HiveSchemaUtil.java
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@@ -138,22 +137,88 @@ public static Type convert(TypeInfo typeInfo) {
}
/**
- * Produces the difference of two FieldSchema lists by only taking into
account the field name and type.
+ * Returns a SchemaDifference containing those fields which are present in
only one of the collections, as well as
+ * those fields which are present in both (in terms of the name) but their
type or comment has changed.
* @param minuendCollection Collection of fields to subtract from
* @param subtrahendCollection Collection of fields to subtract
- * @return the result list of difference
+ * @param bothDirections Whether or not to compute the missing fields from
the minuendCollection as well
+ * @return the difference between the two schemas
*/
- public static Collection<FieldSchema> schemaDifference(
- Collection<FieldSchema> minuendCollection, Collection<FieldSchema>
subtrahendCollection) {
+ public static SchemaDifference getSchemaDiff(Collection<FieldSchema>
minuendCollection,
+ Collection<FieldSchema>
subtrahendCollection, boolean bothDirections) {
+ SchemaDifference difference = new SchemaDifference();
- Function<FieldSchema, FieldSchema> unsetCommentFunc = fs -> new
FieldSchema(fs.getName(), fs.getType(), null);
- Set<FieldSchema> subtrahendWithoutComment =
-
subtrahendCollection.stream().map(unsetCommentFunc).collect(Collectors.toSet());
+ for (FieldSchema first : minuendCollection) {
+ boolean found = false;
+ for (FieldSchema second : subtrahendCollection) {
+ if (first.getName().equals(second.getName())) {
Review comment:
I didn't use it because `name` should never be null, unlike comment (and
maybe type?). Anyways, I've changed it to use Objects.equals to be safe and for
symmetry.
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