deniskuzZ commented on code in PR #6039:
URL: https://github.com/apache/hive/pull/6039#discussion_r2293043352
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standalone-metastore/metastore-client/src/main/java/org/apache/hadoop/hive/metastore/utils/TableFetcher.java:
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@@ -110,24 +114,29 @@ public List<TableName> getTableNames() throws Exception {
return candidates;
}
- public List<Table> getTables(int maxBatchSize) throws Exception {
- List<Table> candidates = new ArrayList<>();
-
+ public Iterable<Table> getTables(int maxBatchSize) throws Exception {
// if tableTypes is empty, then a list with single empty string has to
specified to scan no tables.
if (tableTypes.isEmpty()) {
LOG.info("Table fetcher returns empty list as no table types specified");
- return candidates;
+ return Collections.emptyList();
}
List<String> databases = client.getDatabases(catalogName, dbPattern);
- for (String db : databases) {
- List<String> tablesNames = getTableNamesForDatabase(catalogName, db);
- for (Table table : new TableIterable(client, db, tablesNames,
maxBatchSize)) {
- candidates.add(table);
+ return () -> databases.stream().flatMap(db -> {
Review Comment:
you shouldn't create it eagerly! only once done with 1 table, switch to the
next. No need to open iterators for all of them at once
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