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Arrange for an explicit cast applied to an ARRAY[] constructor to be applied

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directly to all the member expressions, instead of the previous implementation
where the ARRAY[] constructor would infer a common element type and then we'd
coerce the finished array after the fact.  This has a number of benefits,
one being that we can allow an empty ARRAY[] construct so long as its
element type is specified by such a cast.

Brendan Jurd, minor fixes by me.
This commit is contained in:
Tom Lane
2008-03-20 21:42:48 +00:00
parent 8759b79d0f
commit 6b0706ac33
11 changed files with 312 additions and 100 deletions
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17
src/include/nodes/parsenodes.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.359 2008/02/07 17:09:51 tgl Exp $
* $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.360 2008/03/20 21:42:48 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -242,9 +242,9 @@ typedef struct A_Const
* TypeCast - a CAST expression
*
* NOTE: for mostly historical reasons, A_Const parsenodes contain
* room for a TypeName; we only generate a separate TypeCast node if the
* argument to be casted is not a constant. In theory either representation
* would work, but the combined representation saves a bit of code in many
* room for a TypeName, allowing a constant to be marked as being of a given
* type without a separate TypeCast node. Either representation will work,
* but the combined representation saves a bit of code in many
* productions in gram.y.
*/
typedef struct TypeCast
@@ -304,6 +304,15 @@ typedef struct A_Indirection
List *indirection; /* subscripts and/or field names */
} A_Indirection;
/*
* A_ArrayExpr - an ARRAY[] construct
*/
typedef struct A_ArrayExpr
{
NodeTag type;
List *elements; /* array element expressions */
} A_ArrayExpr;
/*
* ResTarget -
* result target (used in target list of pre-transformed parse trees)