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https://github.com/postgres/postgres.git
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Robert Haas
f7d7dade8a
This enables ALTER TABLE to skip table and index rebuilds when the new type is unconstraint varbit, or when the allowable number of bits is not decreasing. Noah Misch, with review and a fix for an OID collision by me.
108 lines
4.1 KiB
C
108 lines
4.1 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) 1996-2012, 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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* src/include/utils/varbit.h
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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_; /* varlena header (do not touch directly!) */
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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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extern Datum bit_in(PG_FUNCTION_ARGS);
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extern Datum bit_out(PG_FUNCTION_ARGS);
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extern Datum bit_recv(PG_FUNCTION_ARGS);
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extern Datum bit_send(PG_FUNCTION_ARGS);
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extern Datum bittypmodin(PG_FUNCTION_ARGS);
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extern Datum bittypmodout(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 varbit_recv(PG_FUNCTION_ARGS);
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extern Datum varbit_send(PG_FUNCTION_ARGS);
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extern Datum varbittypmodin(PG_FUNCTION_ARGS);
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extern Datum varbittypmodout(PG_FUNCTION_ARGS);
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extern Datum bit(PG_FUNCTION_ARGS);
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extern Datum varbit_transform(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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/* avoid the names bitand and bitor, since they are C++ keywords */
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extern Datum bit_and(PG_FUNCTION_ARGS);
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extern Datum bit_or(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 bitsubstr_no_len(PG_FUNCTION_ARGS);
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extern Datum bitoverlay(PG_FUNCTION_ARGS);
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extern Datum bitoverlay_no_len(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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extern Datum bitsetbit(PG_FUNCTION_ARGS);
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extern Datum bitgetbit(PG_FUNCTION_ARGS);
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#endif
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