[teiid-issues] [JBoss JIRA] (TEIID-5426) For Each processing for instead of triggers should materialize change set before processing

[Ramesh Reddy (JIRA)]

Ramesh Reddy created TEIID-5426:
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             Summary: For Each processing for instead of triggers should materialize change set before processing
                 Key: TEIID-5426
                 URL: https://issues.jboss.org/browse/TEIID-5426
             Project: Teiid
          Issue Type: Bug
          Components: Query Engine
    Affects Versions: 11.0
            Reporter: Ramesh Reddy
            Assignee: Steven Hawkins


Currently when a view is defined with Inserts, Updates and Deletes with Instead of Triggers with "FOR EACH" row processing, the change set (the rows that are changing for the statement) typically is like
{code}
loop on (select ids from (view) where predicate) 
begin 
    procedure body 
end 
{code}

where there is a possibility that "procedure body" will change underlying tables such that the "loop on" query results could vary during the processing. Like concurrent updates. This could be avoided by materializing the ids in #temp table before processing any of the rows.



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