difin commented on code in PR #3833:
URL: https://github.com/apache/hive/pull/3833#discussion_r1071406567
##########
ql/src/java/org/apache/hadoop/hive/ql/io/orc/encoded/EncodedTreeReaderFactory.java:
##########
@@ -224,7 +237,252 @@ private static void skipCompressedIndex(boolean
isCompressed, PositionProvider i
index.getNext();
}
- protected static class StringStreamReader extends StringTreeReader
+ public static class StringDictionaryTreeReaderHive extends TreeReader {
Review Comment:
This is added as a fix to many failed CI tests that happened without this
fix.
These new classes are classes from Orc project prior to changes to
StringDictionaryTreeReader that were done as part of ORC-1060.
In more detail: Hive implements its own TreeReaderFactory. In ORC project,
the ticket ORC-1060 - "Reduce memory usage when vectorized reading dictionary
string encoding columns" introduced changes to StringDictionaryTreeReader which
were causing exceptions in Hive EncodedTreeReaderFactory when attempting to
upgrade to ORC 1.8.1. To handle that I added changes to Hive's
EncodedTreeReaderFactory to use StringDictionaryTreeReader version from Orc
project prior to changes from ORC-1060.
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