Fix interaction of triggers, partitioning, and EXPLAIN ANALYZE.
Add a new EState member es_leaf_result_relations, so that the trigger
code knows about ResultRelInfos created by tuple routing. Also make
sure ExplainPrintTriggers knows about partition-related
ResultRelInfos.
Etsuro Fujita, reviewed by Amit Langote
Discussion: http://postgr.es/m/
57163e18-8e56-da83-337a-
22f2c0008051@lab.ntt.co.jp