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Posted to issues@calcite.apache.org by "Chunwei Lei (JIRA)" <ji...@apache.org> on 2018/11/07 03:40:00 UTC
[jira] [Created] (CALCITE-2658) Introducing more
ReduceExpressionRules
Chunwei Lei created CALCITE-2658:
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Summary: Introducing more ReduceExpressionRules
Key: CALCITE-2658
URL: https://issues.apache.org/jira/browse/CALCITE-2658
Project: Calcite
Issue Type: Bug
Components: core
Affects Versions: 1.17.0
Reporter: Chunwei Lei
Assignee: Julian Hyde
Fix For: 1.18.0
It is useful to have rules reducing Exchange/Sort/SortExchange keys, e.g.,
SELECT key,value FROM (SELECT 1 AS key, value FROM src) r DISTRIBUTE BY key;
can be reduced to
SELECT 1 AS key, value FROM src; # Since singleton requirement may already required by SELECT.
SELECT key,value FROM (SELECT 1 AS key, value FROM src) r ORDER BY key;
can be reduced to
SELECT 1 AS key, value FROM src; # Since ordering on constant is useless.
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