wojustme removed a comment on pull request #2702:
URL: https://github.com/apache/calcite/pull/2702#issuecomment-1024816813
Handle for Sort's mv-match
- Equal collation's info, we just check offset and fetch. Query could be
rewritten by mv, when mv's data-range must be larger than query's.
such as:
--query:
Sort(collation: [1], offset: 3)
Calc(program: (expr#0..4=[{inputs}], name=[$t2], deptno=[$t1]))
Scan(table: [hr, emps])
--mv:
Sort(collation: [1], offset: 2)
Calc(program: (expr#0..4=[{inputs}], name=[$t2], deptno=[$t1]))
Scan(table: [hr, emps])
--rewrite:
Sort(collation: [], offset: 1)
Sort(collation: [1], offset: 2)
Calc(program: (expr#0..4=[{inputs}], name=[$t2], deptno=[$t1]))
Scan(table: [hr, emps])
- No-equal collation's info, we could build a new sort above mv's, which
collation must be query's
such as:
--query:
Sort(collation: [1 DESC])
Calc(program: (expr#0..4=[{inputs}], name=[$t2], deptno=[$t1]))
Scan(table: [hr, emps])
--mv:
Sort(collation: [1])
Calc(program: (expr#0..4=[{inputs}], name=[$t2], deptno=[$t1]))
Scan(table: [hr, emps])
--rewrite:
Sort(collation: [1 DESC])
Sort(collation: [1])
Calc(program: (expr#0..4=[{inputs}], name=[$t2], deptno=[$t1]))
Scan(table: [hr, emps])
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