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preconditions check This commit fixes IMPALA-964 where full outer join between two inline views followed by a group by (e.g. select 1 FROM (VALUES(1 x, 1 y)) a FULL OUTER JOIN (VALUES(1 x, 1 y)) b ON (a.x = b.y) GROUP BY a.x;) hits a preconditions check. This check evaluates if the numNodes (number of nodes for the purpose of resource estimation) variable is greater or equal to zero and is triggered when we try to compute the resource estimates (number of distinct values) of a plan fragment. The following changes are included in this commit: 1. Modified the getNumDistinctValues function in PlanFragment class to consider the special case where the numNodes of a plan fragment is -1. 2. Added a test case in QueryTest/joins.test. Change-Id: I2962ed5079e174d0e76ad990ab84e1fb1a4607ef Reviewed-on: http://gerrit.ent.cloudera.com:8080/2466 Reviewed-by: Marcel Kornacker <marcel@cloudera.com> Tested-by: jenkins Reviewed-on: http://gerrit.ent.cloudera.com:8080/2514 Reviewed-by: Dimitris Tsirogiannis <dtsirogiannis@cloudera.com>