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Create a new parsetree node type, TypeCast, so that transformation of

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SQL cast constructs can be performed during expression transformation
instead of during parsing.  This allows constructs like x::numeric(9,2)
and x::int2::float8 to behave as one would expect.
This commit is contained in:
Tom Lane
2000-01-17 00:14:49 +00:00
parent e0bd60171a
commit 49528361f5
10 changed files with 242 additions and 132 deletions
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63
src/backend/parser/parse_target.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/parser/parse_target.c,v 1.51 2000/01/10 17:14:36 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/parser/parse_target.c,v 1.52 2000/01/17 00:14:48 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -24,8 +24,6 @@
#include "utils/syscache.h"
static Node *SizeTargetExpr(ParseState *pstate, Node *expr,
Oid attrtype, int32 attrtypmod);
static List *ExpandAllTables(ParseState *pstate);
static char *FigureColname(Node *expr, Node *resval);
@ -245,9 +243,7 @@ updateTargetListEntry(ParseState *pstate,
* If the target is a fixed-length type, it may need a length
* coercion as well as a type coercion.
*/
if (attrtypmod > 0 &&
attrtypmod != exprTypmod(tle->expr))
tle->expr = SizeTargetExpr(pstate, tle->expr,
tle->expr = coerce_type_typmod(pstate, tle->expr,
attrtype, attrtypmod);
}
}
@ -300,61 +296,6 @@ CoerceTargetExpr(ParseState *pstate,
}
/*
* SizeTargetExpr()
*
* If the target column type possesses a function named for the type
* and having parameter signature (columntype, int4), we assume that
* the type requires coercion to its own length and that the said
* function should be invoked to do that.
*
* Currently, "bpchar" (ie, char(N)) is the only such type, but try
* to be more general than a hard-wired test...
*/
static Node *
SizeTargetExpr(ParseState *pstate,
Node *expr,
Oid attrtype,
int32 attrtypmod)
{
char *funcname;
Oid oid_array[FUNC_MAX_ARGS];
HeapTuple ftup;
int i;
funcname = typeidTypeName(attrtype);
oid_array[0] = attrtype;
oid_array[1] = INT4OID;
for (i = 2; i < FUNC_MAX_ARGS; i++)
oid_array[i] = InvalidOid;
/* attempt to find with arguments exactly as specified... */
ftup = SearchSysCacheTuple(PROCNAME,
PointerGetDatum(funcname),
Int32GetDatum(2),
PointerGetDatum(oid_array),
0);
if (HeapTupleIsValid(ftup))
{
A_Const *cons = makeNode(A_Const);
FuncCall *func = makeNode(FuncCall);
cons->val.type = T_Integer;
cons->val.val.ival = attrtypmod;
func->funcname = funcname;
func->args = lappend(lcons(expr, NIL), cons);
func->agg_star = false;
func->agg_distinct = false;
expr = transformExpr(pstate, (Node *) func, EXPR_COLUMN_FIRST);
}
return expr;
}
/*
* checkInsertTargets -
* generate a list of column names if not supplied or