Add new function planstate_tree_walker.
ExplainPreScanNode knows how to iterate over a generic tree of plan
states; factor that logic out into a separate walker function so that
other code, such as upcoming patches for parallel query, can also use
it.
Patch by me, reviewed by Tom Lane.
Branch
------
master
Details
-------
http://git.postgresql.org/pg/commitdiff/8dd401aa07b91d46f81e51321523864d32843523
Modified Files
--------------
src/backend/commands/explain.c | 93 +-----------------------------
src/backend/nodes/nodeFuncs.c | 125 ++++++++++++++++++++++++++++++++++++++++
src/include/nodes/nodeFuncs.h | 4 ++
3 files changed, 132 insertions(+), 90 deletions(-)