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Do some minor code refactoring in preparation for changing the APIs of
find_inheritance_children() and find_all_inheritors(). I got annoyed that these are buried inside the planner but mostly used elsewhere. So, create a new file catalog/pg_inherits.c and put them there, along with a couple of other functions that search pg_inherits. The code that modifies pg_inherits is (still) in tablecmds.c --- it's kind of entangled with unrelated code that modifies pg_depend and other stuff, so pulling it out seemed like a bigger change than I wanted to make right now. But this file provides a natural home for it if anyone ever gets around to that. This commit just moves code around; it doesn't change anything, except I succumbed to the temptation to make a couple of trivial optimizations in typeInheritsFrom().
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.282 2009/05/07 22:58:28 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/commands/tablecmds.c,v 1.283 2009/05/12 00:56:05 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -50,8 +50,6 @@
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#include "nodes/nodeFuncs.h"
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#include "nodes/parsenodes.h"
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#include "optimizer/clauses.h"
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#include "optimizer/plancat.h"
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#include "optimizer/prep.h"
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#include "parser/gramparse.h"
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#include "parser/parse_clause.h"
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#include "parser/parse_coerce.h"
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@ -1873,7 +1871,6 @@ renameatt(Oid myrelid,
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ListCell *child;
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List *children;
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/* this routine is actually in the planner */
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children = find_all_inheritors(myrelid);
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/*
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@ -3292,7 +3289,6 @@ ATSimpleRecursion(List **wqueue, Relation rel,
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ListCell *child;
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List *children;
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/* this routine is actually in the planner */
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children = find_all_inheritors(relid);
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/*
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@ -3331,7 +3327,6 @@ ATOneLevelRecursion(List **wqueue, Relation rel,
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ListCell *child;
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List *children;
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/* this routine is actually in the planner */
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children = find_inheritance_children(relid);
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foreach(child, children)
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