aglinxinyuan commented on PR #6098:
URL: https://github.com/apache/texera/pull/6098#issuecomment-4884397462

   Good catch — no, we're not. Cache source operators were replaced by 
input-port materialization reader threads in #3425. 
`SpecialPhysicalOpFactory.newSourcePhysicalOp` — the only producer of 
`OpExecSource`, which is what constructs `CacheSourceOpExec` in 
`DataProcessorRPCHandlerInitializer.setupExecutor` — no longer has any 
production caller, so both are effectively dead code.
   
   Dropped `CacheSourceOpExecSpec` from this PR in 19d4967 — no point covering 
a path that's on its way out. Filed #6125 to remove `CacheSourceOpExec` and the 
`OpExecSource` plumbing as a follow-up.
   


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