Eugene Koifman created HIVE-21114:
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Summary: Create read-only transactions
Key: HIVE-21114
URL: https://issues.apache.org/jira/browse/HIVE-21114
Project: Hive
Issue Type: Bug
Components: Transactions
Affects Versions: 4.0.0
Reporter: Eugene Koifman
With HIVE-21036 we have a way to indicate that a txn is read only.
We should (at least in auto-commit mode) determine if the single stmt is a read
and mark the txn accordingly.
Then we can optimize {{TxnHandler.commitTxn()}} so that it doesn't do any
checks in write_set etc.
HiveOperation only has QUERY, which includes Insert and Select, so this
requires figuring out how to determine if a query is a SELECT. By the time
{{Driver.openTransaction();}} is called, we have already parsed the query so
there should be a way to know if the statement only reads.
For multi-stmt txns (once these are supported) we should allow user to indicate
that a txn is read-only and then not allow any statements that can make
modifications in this txn. This should be a different jira.
cc [~ikryvenko]
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