mirror of https://github.com/postgres/postgres
Similar to xid, but 64 bits wide. This new type is suitable for use in various system views and administration functions. Reviewed-by: Fujii Masao <masao.fujii@oss.nttdata.com> Reviewed-by: Takao Fujii <btfujiitkp@oss.nttdata.com> Reviewed-by: Yoshikazu Imai <imai.yoshikazu@fujitsu.com> Reviewed-by: Mark Dilger <mark.dilger@enterprisedb.com> Discussion: https://postgr.es/m/20190725000636.666m5mad25wfbrri%40alap3.anarazel.depull/51/head
Thomas Munro
6 years ago
parent
4bea576b03
commit
aeec457de8
@ -0,0 +1,22 @@ |
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/*-------------------------------------------------------------------------
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* |
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* xid8.h |
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* Header file for the "xid8" ADT. |
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* |
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* Copyright (c) 2020, PostgreSQL Global Development Group |
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* |
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* src/include/utils/xid8.h |
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* |
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*------------------------------------------------------------------------- |
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*/ |
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#ifndef XID8_H |
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#define XID8_H |
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#include "access/transam.h" |
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#define DatumGetFullTransactionId(X) (FullTransactionIdFromU64(DatumGetUInt64(X))) |
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#define FullTransactionIdGetDatum(X) (UInt64GetDatum(U64FromFullTransactionId(X))) |
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#define PG_GETARG_FULLTRANSACTIONID(X) DatumGetFullTransactionId(PG_GETARG_DATUM(X)) |
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#define PG_RETURN_FULLTRANSACTIONID(X) return FullTransactionIdGetDatum(X) |
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#endif /* XID8_H */ |
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@ -0,0 +1,136 @@ |
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-- xid and xid8 |
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-- values in range, in octal, decimal, hex |
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select '010'::xid, |
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'42'::xid, |
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'0xffffffff'::xid, |
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'-1'::xid, |
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'010'::xid8, |
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'42'::xid8, |
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'0xffffffffffffffff'::xid8, |
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'-1'::xid8; |
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xid | xid | xid | xid | xid8 | xid8 | xid8 | xid8 |
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-----+-----+------------+------------+------+------+----------------------+---------------------- |
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8 | 42 | 4294967295 | 4294967295 | 8 | 42 | 18446744073709551615 | 18446744073709551615 |
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(1 row) |
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-- garbage values are not yet rejected (perhaps they should be) |
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select ''::xid; |
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xid |
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----- |
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0 |
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(1 row) |
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select 'asdf'::xid; |
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xid |
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----- |
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0 |
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(1 row) |
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select ''::xid8; |
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xid8 |
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------ |
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0 |
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(1 row) |
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select 'asdf'::xid8; |
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xid8 |
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------ |
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0 |
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(1 row) |
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-- equality |
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select '1'::xid = '1'::xid; |
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?column? |
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---------- |
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t |
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(1 row) |
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select '1'::xid != '1'::xid; |
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?column? |
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---------- |
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f |
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(1 row) |
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select '1'::xid8 = '1'::xid8; |
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?column? |
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---------- |
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t |
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(1 row) |
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select '1'::xid8 != '1'::xid8; |
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?column? |
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---------- |
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f |
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(1 row) |
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-- conversion |
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select '1'::xid = '1'::xid8::xid; |
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?column? |
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---------- |
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t |
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(1 row) |
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select '1'::xid != '1'::xid8::xid; |
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?column? |
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---------- |
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f |
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(1 row) |
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-- we don't want relational operators for xid, due to use of modular arithmetic |
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select '1'::xid < '2'::xid; |
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ERROR: operator does not exist: xid < xid |
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LINE 1: select '1'::xid < '2'::xid; |
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^ |
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HINT: No operator matches the given name and argument types. You might need to add explicit type casts. |
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select '1'::xid <= '2'::xid; |
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ERROR: operator does not exist: xid <= xid |
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LINE 1: select '1'::xid <= '2'::xid; |
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^ |
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HINT: No operator matches the given name and argument types. You might need to add explicit type casts. |
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select '1'::xid > '2'::xid; |
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ERROR: operator does not exist: xid > xid |
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LINE 1: select '1'::xid > '2'::xid; |
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^ |
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HINT: No operator matches the given name and argument types. You might need to add explicit type casts. |
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select '1'::xid >= '2'::xid; |
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ERROR: operator does not exist: xid >= xid |
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LINE 1: select '1'::xid >= '2'::xid; |
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^ |
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HINT: No operator matches the given name and argument types. You might need to add explicit type casts. |
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-- we want them for xid8 though |
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select '1'::xid8 < '2'::xid8, '2'::xid8 < '2'::xid8, '2'::xid8 < '1'::xid8; |
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?column? | ?column? | ?column? |
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----------+----------+---------- |
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t | f | f |
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(1 row) |
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select '1'::xid8 <= '2'::xid8, '2'::xid8 <= '2'::xid8, '2'::xid8 <= '1'::xid8; |
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?column? | ?column? | ?column? |
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----------+----------+---------- |
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t | t | f |
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(1 row) |
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select '1'::xid8 > '2'::xid8, '2'::xid8 > '2'::xid8, '2'::xid8 > '1'::xid8; |
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?column? | ?column? | ?column? |
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----------+----------+---------- |
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f | f | t |
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(1 row) |
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select '1'::xid8 >= '2'::xid8, '2'::xid8 >= '2'::xid8, '2'::xid8 >= '1'::xid8; |
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?column? | ?column? | ?column? |
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----------+----------+---------- |
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f | t | t |
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(1 row) |
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-- we also have a 3way compare for btrees |
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select xid8cmp('1', '2'), xid8cmp('2', '2'), xid8cmp('2', '1'); |
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xid8cmp | xid8cmp | xid8cmp |
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---------+---------+--------- |
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-1 | 0 | 1 |
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(1 row) |
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-- xid8 has btree and hash opclasses |
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create table xid8_t1 (x xid8); |
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create index on xid8_t1 using btree(x); |
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create index on xid8_t1 using hash(x); |
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drop table xid8_t1; |
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@ -0,0 +1,48 @@ |
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-- xid and xid8 |
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-- values in range, in octal, decimal, hex |
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select '010'::xid, |
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'42'::xid, |
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'0xffffffff'::xid, |
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'-1'::xid, |
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'010'::xid8, |
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'42'::xid8, |
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'0xffffffffffffffff'::xid8, |
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'-1'::xid8; |
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-- garbage values are not yet rejected (perhaps they should be) |
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select ''::xid; |
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select 'asdf'::xid; |
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select ''::xid8; |
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select 'asdf'::xid8; |
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-- equality |
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select '1'::xid = '1'::xid; |
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select '1'::xid != '1'::xid; |
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select '1'::xid8 = '1'::xid8; |
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select '1'::xid8 != '1'::xid8; |
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-- conversion |
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select '1'::xid = '1'::xid8::xid; |
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select '1'::xid != '1'::xid8::xid; |
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-- we don't want relational operators for xid, due to use of modular arithmetic |
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select '1'::xid < '2'::xid; |
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select '1'::xid <= '2'::xid; |
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select '1'::xid > '2'::xid; |
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select '1'::xid >= '2'::xid; |
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-- we want them for xid8 though |
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select '1'::xid8 < '2'::xid8, '2'::xid8 < '2'::xid8, '2'::xid8 < '1'::xid8; |
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select '1'::xid8 <= '2'::xid8, '2'::xid8 <= '2'::xid8, '2'::xid8 <= '1'::xid8; |
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select '1'::xid8 > '2'::xid8, '2'::xid8 > '2'::xid8, '2'::xid8 > '1'::xid8; |
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select '1'::xid8 >= '2'::xid8, '2'::xid8 >= '2'::xid8, '2'::xid8 >= '1'::xid8; |
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-- we also have a 3way compare for btrees |
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select xid8cmp('1', '2'), xid8cmp('2', '2'), xid8cmp('2', '1'); |
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-- xid8 has btree and hash opclasses |
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create table xid8_t1 (x xid8); |
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create index on xid8_t1 using btree(x); |
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create index on xid8_t1 using hash(x); |
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drop table xid8_t1; |
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