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Posted to issues@calcite.apache.org by "Julian Hyde (JIRA)" <ji...@apache.org> on 2019/06/24 18:41:00 UTC
[jira] [Created] (CALCITE-3144) Add rule,
CaseFilteredAggregatorRule, that converts "SUM(CASE WHEN b THEN x END)" to
"SUM(x) FILTER (WHERE b)"
Julian Hyde created CALCITE-3144:
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Summary: Add rule, CaseFilteredAggregatorRule, that converts "SUM(CASE WHEN b THEN x END)" to "SUM(x) FILTER (WHERE b)"
Key: CALCITE-3144
URL: https://issues.apache.org/jira/browse/CALCITE-3144
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
Add a rule that converts "SUM(CASE WHEN b THEN x END)" to "SUM(x) FILTER (WHERE b)".
Druid added {{CaseFilteredAggregatorRule}} in https://github.com/apache/incubator-druid/pull/4360.
Maybe {{AggregateCaseToFilterRule}} is a slightly better name. Or maybe this transform could be done in {{RelBuilder.aggregate}}, and we wouldn't need a rule.
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