Eugene Koifman created HIVE-18662:
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Summary: hive.acid.key.index is missing entries
Key: HIVE-18662
URL: https://issues.apache.org/jira/browse/HIVE-18662
Project: Hive
Issue Type: Bug
Components: Transactions
Reporter: Eugene Koifman
OrcRecordUpdater.KeyIndexBuilder stores an index in ORC footer where each entry
is the last ROW__ID of each stripe. In acid1 this is used to filter the events
from delta file when merging with part of the base.
as can be seen in \{{TestTxnCommands.testVersioning()}} (added in HIVE-18659)
the \{{hive.acid.key.index}} is empty.
This is because very little data is written and WriterImpl.flushStripe() is not
called except when \{{WriterImpl.close()} is called. In the later,
\{{WriterCallback.preFooterWrite()}} is called before \{{preStripeWrite}} and
so KeyIndexBuilder.preFooterWriter() records nothing in \{{hive.acid.key.index}}
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