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b26dfb9522
to be flexible about assignment casts without introducing ambiguity in operator/function resolution. Introduce a well-defined promotion hierarchy for numeric datatypes (int2->int4->int8->numeric->float4->float8). Change make_const to initially label numeric literals as int4, int8, or numeric (never float8 anymore). Explicitly mark Func and RelabelType nodes to indicate whether they came from a function call, explicit cast, or implicit cast; use this to do reverse-listing more accurately and without so many heuristics. Explicit casts to char, varchar, bit, varbit will truncate or pad without raising an error (the pre-7.2 behavior), while assigning to a column without any explicit cast will still raise an error for wrong-length data like 7.3. This more nearly follows the SQL spec than 7.2 behavior (we should be reporting a 'completion condition' in the explicit-cast cases, but we have no mechanism for that, so just do silent truncation). Fix some problems with enforcement of typmod for array elements; it didn't work at all in 'UPDATE ... SET array[n] = foo', for example. Provide a generalized array_length_coerce() function to replace the specialized per-array-type functions that used to be needed (and were missing for NUMERIC as well as all the datetime types). Add missing conversions int8<->float4, text<->numeric, oid<->int8. initdb forced.
93 lines
3.4 KiB
C
93 lines
3.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* varbit.h
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* Functions for the SQL datatypes BIT() and BIT VARYING().
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*
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* Code originally contributed by Adriaan Joubert.
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*
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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: varbit.h,v 1.16 2002/09/18 21:35:25 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef VARBIT_H
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#define VARBIT_H
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#include "fmgr.h"
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/*
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* Modeled on struct varlena from postgres.h, but data type is bits8.
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*/
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typedef struct
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{
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int32 vl_len; /* standard varlena header (total size in
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* bytes) */
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int32 bit_len; /* number of valid bits */
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bits8 bit_dat[1]; /* bit string, most sig. byte first */
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} VarBit;
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/*
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* fmgr interface macros
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*
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* BIT and BIT VARYING are toastable varlena types. They are the same
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* as far as representation goes, so we just have one set of macros.
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*/
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#define DatumGetVarBitP(X) ((VarBit *) PG_DETOAST_DATUM(X))
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#define DatumGetVarBitPCopy(X) ((VarBit *) PG_DETOAST_DATUM_COPY(X))
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#define VarBitPGetDatum(X) PointerGetDatum(X)
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#define PG_GETARG_VARBIT_P(n) DatumGetVarBitP(PG_GETARG_DATUM(n))
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#define PG_GETARG_VARBIT_P_COPY(n) DatumGetVarBitPCopy(PG_GETARG_DATUM(n))
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#define PG_RETURN_VARBIT_P(x) return VarBitPGetDatum(x)
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/* Header overhead *in addition to* VARHDRSZ */
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#define VARBITHDRSZ sizeof(int32)
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/* Number of bits in this bit string */
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#define VARBITLEN(PTR) (((VarBit *) (PTR))->bit_len)
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/* Pointer to the first byte containing bit string data */
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#define VARBITS(PTR) (((VarBit *) (PTR))->bit_dat)
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/* Number of bytes in the data section of a bit string */
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#define VARBITBYTES(PTR) (VARSIZE(PTR) - VARHDRSZ - VARBITHDRSZ)
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/* Padding of the bit string at the end (in bits) */
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#define VARBITPAD(PTR) (VARBITBYTES(PTR)*BITS_PER_BYTE - VARBITLEN(PTR))
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/* Number of bytes needed to store a bit string of a given length */
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#define VARBITTOTALLEN(BITLEN) (((BITLEN) + BITS_PER_BYTE-1)/BITS_PER_BYTE + \
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VARHDRSZ + VARBITHDRSZ)
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/* pointer beyond the end of the bit string (like end() in STL containers) */
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#define VARBITEND(PTR) (((bits8 *) (PTR)) + VARSIZE(PTR))
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/* Mask that will cover exactly one byte, i.e. BITS_PER_BYTE bits */
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#define BITMASK 0xFF
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#define BITHIGH 0x80
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extern Datum bit_in(PG_FUNCTION_ARGS);
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extern Datum bit_out(PG_FUNCTION_ARGS);
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extern Datum varbit_in(PG_FUNCTION_ARGS);
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extern Datum varbit_out(PG_FUNCTION_ARGS);
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extern Datum bit(PG_FUNCTION_ARGS);
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extern Datum varbit(PG_FUNCTION_ARGS);
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extern Datum biteq(PG_FUNCTION_ARGS);
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extern Datum bitne(PG_FUNCTION_ARGS);
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extern Datum bitlt(PG_FUNCTION_ARGS);
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extern Datum bitle(PG_FUNCTION_ARGS);
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extern Datum bitgt(PG_FUNCTION_ARGS);
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extern Datum bitge(PG_FUNCTION_ARGS);
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extern Datum bitcmp(PG_FUNCTION_ARGS);
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extern Datum bitand(PG_FUNCTION_ARGS);
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extern Datum bitor(PG_FUNCTION_ARGS);
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extern Datum bitxor(PG_FUNCTION_ARGS);
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extern Datum bitnot(PG_FUNCTION_ARGS);
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extern Datum bitshiftleft(PG_FUNCTION_ARGS);
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extern Datum bitshiftright(PG_FUNCTION_ARGS);
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extern Datum bitcat(PG_FUNCTION_ARGS);
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extern Datum bitsubstr(PG_FUNCTION_ARGS);
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extern Datum bitlength(PG_FUNCTION_ARGS);
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extern Datum bitoctetlength(PG_FUNCTION_ARGS);
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extern Datum bitfromint4(PG_FUNCTION_ARGS);
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extern Datum bittoint4(PG_FUNCTION_ARGS);
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extern Datum bitfromint8(PG_FUNCTION_ARGS);
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extern Datum bittoint8(PG_FUNCTION_ARGS);
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extern Datum bitposition(PG_FUNCTION_ARGS);
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#endif
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