Make details of the Numeric representation private to numeric.c.
Review by Tom Lane.
This commit is contained in:
Robert Haas
parent
f223bb7a41
commit
8a4dc94ca0
@ -1,5 +1,5 @@
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/*
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* $PostgreSQL: pgsql/contrib/btree_gist/btree_numeric.c,v 1.13 2009/06/11 14:48:50 momjian Exp $
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* $PostgreSQL: pgsql/contrib/btree_gist/btree_numeric.c,v 1.14 2010/07/30 04:30:23 rhaas Exp $
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*/
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#include "btree_gist.h"
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@ -185,9 +185,9 @@ gbt_numeric_penalty(PG_FUNCTION_ARGS)
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NumericGetDatum(os)
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));
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if (NUMERIC_IS_NAN(us))
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if (numeric_is_nan(us))
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{
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if (NUMERIC_IS_NAN(os))
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if (numeric_is_nan(os))
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*result = 0.0;
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else
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*result = 1.0;
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@ -8,7 +8,7 @@
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/adt/format_type.c,v 1.53 2010/02/14 18:42:16 rhaas Exp $
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* $PostgreSQL: pgsql/src/backend/utils/adt/format_type.c,v 1.54 2010/07/30 04:30:23 rhaas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -387,15 +387,7 @@ type_maximum_size(Oid type_oid, int32 typemod)
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+ VARHDRSZ;
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case NUMERICOID:
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/* precision (ie, max # of digits) is in upper bits of typmod */
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if (typemod > VARHDRSZ)
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{
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int precision = ((typemod - VARHDRSZ) >> 16) & 0xffff;
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/* Numeric stores 2 decimal digits/byte, plus header */
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return (precision + 1) / 2 + NUMERIC_HDRSZ;
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}
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break;
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return numeric_maximum_size(typemod);
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case VARBITOID:
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case BITOID:
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@ -14,7 +14,7 @@
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* Copyright (c) 1998-2010, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.123 2010/02/26 02:01:09 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.124 2010/07/30 04:30:23 rhaas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -35,6 +35,38 @@
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#include "utils/int8.h"
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#include "utils/numeric.h"
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/*
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* Sign values and macros to deal with packing/unpacking n_sign_dscale
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*/
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#define NUMERIC_SIGN_MASK 0xC000
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#define NUMERIC_POS 0x0000
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#define NUMERIC_NEG 0x4000
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#define NUMERIC_NAN 0xC000
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#define NUMERIC_DSCALE_MASK 0x3FFF
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#define NUMERIC_SIGN(n) ((n)->n_sign_dscale & NUMERIC_SIGN_MASK)
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#define NUMERIC_DSCALE(n) ((n)->n_sign_dscale & NUMERIC_DSCALE_MASK)
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#define NUMERIC_IS_NAN(n) (NUMERIC_SIGN(n) != NUMERIC_POS && \
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NUMERIC_SIGN(n) != NUMERIC_NEG)
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#define NUMERIC_HDRSZ (VARHDRSZ + sizeof(uint16) + sizeof(int16))
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/*
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* The Numeric data type stored in the database
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*
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* NOTE: by convention, values in the packed form have been stripped of
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* all leading and trailing zero digits (where a "digit" is of base NBASE).
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* In particular, if the value is zero, there will be no digits at all!
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* The weight is arbitrary in that case, but we normally set it to zero.
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*/
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struct NumericData
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{
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int32 vl_len_; /* varlena header (do not touch directly!) */
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uint16 n_sign_dscale; /* Sign + display scale */
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int16 n_weight; /* Weight of 1st digit */
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char n_data[1]; /* Digits (really array of NumericDigit) */
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};
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/* ----------
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* Uncomment the following to enable compilation of dump_numeric()
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* and dump_var() and to get a dump of any result produced by make_result().
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@ -427,6 +459,37 @@ numeric_out(PG_FUNCTION_ARGS)
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PG_RETURN_CSTRING(str);
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}
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/*
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* numeric_is_nan() -
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*
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* Is Numeric value a NaN?
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*/
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bool
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numeric_is_nan(Numeric num)
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{
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return NUMERIC_IS_NAN(num);
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}
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/*
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* numeric_maximum_size() -
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*
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* Maximum size of a numeric with given typmod, or -1 if unlimited/unknown.
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*/
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int32
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numeric_maximum_size(int32 typemod)
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{
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int precision;
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if (typemod <= VARHDRSZ)
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return -1;
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/* precision (ie, max # of digits) is in upper bits of typmod */
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precision = ((typemod - VARHDRSZ) >> 16) & 0xffff;
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/* Numeric stores 2 decimal digits/byte, plus header */
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return (precision + 1) / 2 + NUMERIC_HDRSZ;
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}
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/*
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* numeric_out_sci() -
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*
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@ -7,7 +7,7 @@
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*
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* Copyright (c) 1998-2010, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/include/utils/numeric.h,v 1.29 2010/01/02 16:58:10 momjian Exp $
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* $PostgreSQL: pgsql/src/include/utils/numeric.h,v 1.30 2010/07/30 04:30:23 rhaas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -37,41 +37,9 @@
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*/
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#define NUMERIC_MIN_SIG_DIGITS 16
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/*
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* Sign values and macros to deal with packing/unpacking n_sign_dscale
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*/
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#define NUMERIC_SIGN_MASK 0xC000
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#define NUMERIC_POS 0x0000
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#define NUMERIC_NEG 0x4000
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#define NUMERIC_NAN 0xC000
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#define NUMERIC_DSCALE_MASK 0x3FFF
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#define NUMERIC_SIGN(n) ((n)->n_sign_dscale & NUMERIC_SIGN_MASK)
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#define NUMERIC_DSCALE(n) ((n)->n_sign_dscale & NUMERIC_DSCALE_MASK)
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#define NUMERIC_IS_NAN(n) (NUMERIC_SIGN(n) != NUMERIC_POS && \
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NUMERIC_SIGN(n) != NUMERIC_NEG)
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/*
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* The Numeric data type stored in the database
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*
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* NOTE: by convention, values in the packed form have been stripped of
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* all leading and trailing zero digits (where a "digit" is of base NBASE).
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* In particular, if the value is zero, there will be no digits at all!
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* The weight is arbitrary in that case, but we normally set it to zero.
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*/
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typedef struct NumericData
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{
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int32 vl_len_; /* varlena header (do not touch directly!) */
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uint16 n_sign_dscale; /* Sign + display scale */
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int16 n_weight; /* Weight of 1st digit */
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char n_data[1]; /* Digits (really array of NumericDigit) */
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} NumericData;
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typedef NumericData *Numeric;
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#define NUMERIC_HDRSZ (VARHDRSZ + sizeof(uint16) + sizeof(int16))
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/* The actual contents of Numeric are private to numeric.c */
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struct NumericData;
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typedef struct NumericData *Numeric;
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/*
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* fmgr interface macros
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@ -87,6 +55,8 @@ typedef NumericData *Numeric;
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/*
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* Utility functions in numeric.c
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*/
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extern bool numeric_is_nan(Numeric num);
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int32 numeric_maximum_size(int32 typemod);
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extern char *numeric_out_sci(Numeric num, int scale);
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#endif /* _PG_NUMERIC_H_ */
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