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由 Haisheng Yuan 提交于
As of commit c7ff7663, subplans are initialized even they are unused. In some case, the generated subplan is not used, but it has motionId = 0, which breaks executor's sanity check. This patch fixes the issue by removing unused subplans. See discussions at: https://github.com/greenplum-db/gpdb/issues/2383
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