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https://issues.apache.org/jira/browse/HIVE-18948?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16408437#comment-16408437
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Eugene Koifman commented on HIVE-18948:
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WriteEntity also has a WriteType which determines lock type - can that be built
from AST?
Also, could you add a guess at how much effort this is?
> Acquire locks before generating the valid transaction list
> ----------------------------------------------------------
>
> Key: HIVE-18948
> URL: https://issues.apache.org/jira/browse/HIVE-18948
> Project: Hive
> Issue Type: Improvement
> Components: Transactions
> Affects Versions: 3.0.0
> Reporter: Jesus Camacho Rodriguez
> Priority: Critical
>
> HIVE-18825 moves the valid transaction list generation logic before query
> optimization. In order to support lock-based concurrency control correctly,
> the logic to acquire the locks has to be moved before query optimization too,
> and before the valid transaction list is generated.
> This requires a bit of work/refactoring, since lock acquisition logic relies
> on read/write entities, and it is heavily dependent on the QueryPlan object
> too, e.g., it sets some properties in the file sink descriptors for the plan.
> Currently, all these data structures (except for read entities) are only
> available after query has been optimized, hence we will need to 1) generate
> some of this data structures before query optimization, e.g., write entities,
> and 2) create and propagate some of the properties so they are set during
> query optimization, e.g., those properties contained in the file sink
> descriptors.
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