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Add new function planstate_tree_walker.

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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.
This commit is contained in:
Robert Haas
2015-09-17 11:24:49 -04:00
parent 293fd7c77e
commit 8dd401aa07
3 changed files with 132 additions and 90 deletions
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4
src/include/nodes/nodeFuncs.h
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@@ -63,4 +63,8 @@ extern Node *query_or_expression_tree_mutator(Node *node, Node *(*mutator) (),
extern bool raw_expression_tree_walker(Node *node, bool (*walker) (),
void *context);
struct PlanState;
extern bool planstate_tree_walker(struct PlanState *planstate, bool (*walker) (),
void *context);
#endif /* NODEFUNCS_H */