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  1. Calcite
  2. CALCITE-2658

Introducing more ReduceExpressionRules

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      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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              Chunwei Lei Chunwei Lei
              Chunwei Lei Chunwei Lei
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