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Make _outPathInfo print the relid set of the path's parent rel.

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We can't actually print the parent RelOptInfo in toto, because that would
lead to infinite recursion.  But it's safe enough to reach into the parent
and print its identifying relids, and that makes it a whole lot easier
to figure out what a Path represents.  Should have done this years ago.
This commit is contained in:
Tom Lane 2010-09-23 15:16:49 -04:00
parent 7e8c25c66e
commit 003788e81e
1 changed files with 4 additions and 1 deletions
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5
src/backend/nodes/outfuncs.c
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@ -1352,12 +1352,15 @@ _outFromExpr(StringInfo str, FromExpr *node)
/* /*
* print the basic stuff of all nodes that inherit from Path * print the basic stuff of all nodes that inherit from Path
* *
* Note we do NOT print the parent, else we'd be in infinite recursion * Note we do NOT print the parent, else we'd be in infinite recursion.
* We can print the parent's relids for identification purposes, though.
*/ */
static void static void
_outPathInfo(StringInfo str, Path *node) _outPathInfo(StringInfo str, Path *node)
{ {
WRITE_ENUM_FIELD(pathtype, NodeTag); WRITE_ENUM_FIELD(pathtype, NodeTag);
appendStringInfo(str, " :parent_relids ");
_outBitmapset(str, node->parent->relids);
WRITE_FLOAT_FIELD(startup_cost, "%.2f"); WRITE_FLOAT_FIELD(startup_cost, "%.2f");
WRITE_FLOAT_FIELD(total_cost, "%.2f"); WRITE_FLOAT_FIELD(total_cost, "%.2f");
WRITE_NODE_FIELD(pathkeys); WRITE_NODE_FIELD(pathkeys);