[DRILL-1167] Split large runtime generated functions into a chain of functions

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.4.0
• Fix Version/s: 0.4.0
• Component/s: Execution - Codegen
• Assignee: Aditya Kishore
• Reporter: Aditya Kishore
• Created: 22/Jul/14 10:53
• Updated: 27/Jul/14 18:50
• Resolved: 27/Jul/14 18:50

Description

Since a Java function can not grow beyond 64kb (of byte code), it would be useful to split such functions into multiple functions and invoke them as a chain.

For example, the following function

public boolean doEval() {
  //block 0:
  {
    ...
  }
...
  //block m-1:
  {
    ...
  }
  //block m:
  {
    ...
  }
...
  //block n:
  {
    ...
  }
  {
    return true;
  }
}

Can be re-written as:

public boolean doEval() {
  //block 0:
  {
    ...
  }
...
  //block m-1:
  {
    ...
  }
  return doEval0();
}

public boolean doEval0() {
  //block m:
  {
    ...
  }
...
  //block n:
  {
    ...
  }
  {
    return true;
  }
}