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Get rid of long-since-vestigial Iter node type, in favor of adding a
returns-set boolean field in Func and Oper nodes. This allows cleaner, more reliable tests for expressions returning sets in the planner and parser. For example, a WHERE clause returning a set is now detected and complained of in the parser, not only at runtime.
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@@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2001, 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: parse_coerce.h,v 1.42 2002/04/11 20:00:15 tgl Exp $
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* $Id: parse_coerce.h,v 1.43 2002/05/12 23:43:04 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -45,7 +45,7 @@ extern Node *coerce_type(ParseState *pstate, Node *node, Oid inputTypeId,
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extern Node *coerce_type_typmod(ParseState *pstate, Node *node,
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Oid targetTypeId, int32 atttypmod);
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extern bool coerce_to_boolean(ParseState *pstate, Node **pnode);
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extern Node *coerce_to_boolean(Node *node, const char *constructName);
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extern Oid select_common_type(List *typeids, const char *context);
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extern Node *coerce_to_common_type(ParseState *pstate, Node *node,
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