Jesus Camacho Rodriguez created HIVE-18948:

             Summary: Acquire locks before generating the valid transaction list
                 Key: HIVE-18948
             Project: Hive
          Issue Type: Improvement
          Components: Transactions
    Affects Versions: 3.0.0
            Reporter: Jesus Camacho Rodriguez

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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