hsyuan commented on issue #1763: [CALCITE-3738] Missing order by logical plan 
for insert statement
URL: https://github.com/apache/calcite/pull/1763#issuecomment-574948962
 
 
   You are tagging wrong person. :)
   Perhaps. A relation is a bag (multi-set), which is un-ordered. This is the 
foundation of relational algebra.
   When you insert into a log file, it just happens to be sorted on disk. But 
when you read it out, order is not guaranteed unless you specify order-by. 
   https://en.wikipedia.org/wiki/Relation_(database)

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