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Julian Hyde commented on CALCITE-2658: -------------------------------------- Reviewing PR 912 WindowReduceExpressionsRule: * Can you please split either 912 or 921 into a separate JIRA case? * The code looks good, but the test case only tests removing ORDER BY keys if they are already in PARTITION BY. It doesn't test constant reduction. Can you add a test for that? * I think you should add the rule to CalcitePrepareImpl.CONSTANT_REDUCTION_RULES, alongside the likes of ReduceExpressionsRule.CALC_INSTANCE, so that the rule will be applied by default. > 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 > Priority: Major > 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. -- This message was sent by Atlassian JIRA (v7.6.3#76005)