Fix EXPLAIN output for subplans in MERGE. Given a subplan in a MERGE query, EXPLAIN would sometimes fail to properly display expressions involving Params referencing variables in other parts of the plan tree.
This would affect subplans outside the topmost join plan node, for which expansion of Params would go via the top-level ModifyTable plan node. The problem was that "inner_tlist" for the ModifyTable node's deparse_namespace was set to the join node's targetlist, but "inner_plan" was set to the ModifyTable node itself, rather than the join node, leading to incorrect results when descending to the referenced variable. Fix and backpatch to v15, where MERGE was introduced. Discussion: https://postgr.es/m/CAEZATCWAv-sZuH%2BwG5xJ-%2BGt7qGNGX8wUQd3XYydMFDKgRB9nw%40mail.gmail.com Branch ------ REL_16_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/34c854b93fbec6d7b6dce4ee48c5b7459364a124 Modified Files -------------- src/backend/utils/adt/ruleutils.c | 21 +++++++++------- src/test/regress/expected/merge.out | 50 +++++++++++++++++++++++++++++++++++++ src/test/regress/sql/merge.sql | 17 +++++++++++++ 3 files changed, 79 insertions(+), 9 deletions(-)
