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Clean up plantree representation of SubPlan-s --- SubLink does not appear
in the planned representation of a subplan at all any more, only SubPlan. This means subselect.c doesn't scribble on its input anymore, which seems like a good thing; and there are no longer three different possible interpretations of a SubLink. Simplify node naming and improve comments in primnodes.h. No change to stored rules, though.
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: nodes.h,v 1.132 2002/12/13 19:46:00 tgl Exp $
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* $Id: nodes.h,v 1.133 2002/12/14 00:17:59 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -107,7 +107,7 @@ typedef enum NodeTag
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T_DistinctExpr,
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T_BoolExpr,
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T_SubLink,
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T_SubPlanExpr,
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T_SubPlan,
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T_FieldSelect,
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T_RelabelType,
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T_CaseExpr,
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@ -133,7 +133,7 @@ typedef enum NodeTag
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T_ArrayRefExprState,
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T_FuncExprState,
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T_BoolExprState,
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T_SubPlanExprState,
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T_SubPlanState,
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T_CaseExprState,
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T_CaseWhenState,
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T_ConstraintTestState,
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