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Add +(pg_lsn,numeric) and -(pg_lsn,numeric) operators.
By using these operators, the number of bytes can be added into and subtracted from LSN. Bump catalog version. Author: Fujii Masao Reviewed-by: Kyotaro Horiguchi, Michael Paquier, Asif Rehman Discussion: https://postgr.es/m/ed9f7f74-e996-67f8-554a-52ebd3779b3b@oss.nttdata.com
This commit is contained in:
doc/src/sgml
src
backend
include
test
regress
@ -41,6 +41,7 @@
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#include "utils/guc.h"
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#include "utils/int8.h"
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#include "utils/numeric.h"
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#include "utils/pg_lsn.h"
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#include "utils/sortsupport.h"
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/* ----------
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@ -472,6 +473,7 @@ static void apply_typmod(NumericVar *var, int32 typmod);
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static bool numericvar_to_int32(const NumericVar *var, int32 *result);
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static bool numericvar_to_int64(const NumericVar *var, int64 *result);
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static void int64_to_numericvar(int64 val, NumericVar *var);
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static bool numericvar_to_uint64(const NumericVar *var, uint64 *result);
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#ifdef HAVE_INT128
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static bool numericvar_to_int128(const NumericVar *var, int128 *result);
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static void int128_to_numericvar(int128 val, NumericVar *var);
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@ -3692,6 +3694,30 @@ numeric_float4(PG_FUNCTION_ARGS)
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}
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Datum
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numeric_pg_lsn(PG_FUNCTION_ARGS)
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{
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Numeric num = PG_GETARG_NUMERIC(0);
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NumericVar x;
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XLogRecPtr result;
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if (NUMERIC_IS_NAN(num))
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("cannot convert NaN to pg_lsn")));
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/* Convert to variable format and thence to pg_lsn */
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init_var_from_num(num, &x);
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if (!numericvar_to_uint64(&x, (uint64 *) &result))
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("pg_lsn out of range")));
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PG_RETURN_LSN(result);
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}
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/* ----------------------------------------------------------------------
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*
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* Aggregate functions
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@ -6742,6 +6768,78 @@ int64_to_numericvar(int64 val, NumericVar *var)
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var->weight = ndigits - 1;
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}
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/*
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* Convert numeric to uint64, rounding if needed.
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*
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* If overflow, return false (no error is raised). Return true if okay.
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*/
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static bool
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numericvar_to_uint64(const NumericVar *var, uint64 *result)
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{
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NumericDigit *digits;
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int ndigits;
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int weight;
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int i;
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uint64 val;
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NumericVar rounded;
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/* Round to nearest integer */
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init_var(&rounded);
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set_var_from_var(var, &rounded);
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round_var(&rounded, 0);
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/* Check for zero input */
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strip_var(&rounded);
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ndigits = rounded.ndigits;
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if (ndigits == 0)
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{
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*result = 0;
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free_var(&rounded);
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return true;
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}
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/* Check for negative input */
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if (rounded.sign == NUMERIC_NEG)
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{
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free_var(&rounded);
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return false;
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}
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/*
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* For input like 10000000000, we must treat stripped digits as real. So
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* the loop assumes there are weight+1 digits before the decimal point.
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*/
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weight = rounded.weight;
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Assert(weight >= 0 && ndigits <= weight + 1);
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/* Construct the result */
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digits = rounded.digits;
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val = digits[0];
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for (i = 1; i <= weight; i++)
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{
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if (unlikely(pg_mul_u64_overflow(val, NBASE, &val)))
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{
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free_var(&rounded);
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return false;
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}
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if (i < ndigits)
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{
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if (unlikely(pg_add_u64_overflow(val, digits[i], &val)))
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{
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free_var(&rounded);
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return false;
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}
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}
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}
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free_var(&rounded);
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*result = val;
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return true;
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}
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#ifdef HAVE_INT128
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/*
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* Convert numeric to int128, rounding if needed.
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