I am going through the Executor code and come across the following terms quite often. Can someone tell me what do they
mean(in a few (may be a couple of) sentences)?<br /><br />1. Scan State<br />2. Plan State<br />3. Tuple Projection<br
/>4. EState<br />5. Qual<br />6. Expression<br /><br />They sound quite ambiguous in the source code, specially when
someof them already have terms which have multiple meanings. <br /><br />Thanks for your time. <br /><br />-Vaibhav
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