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Commitc138979

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committed
Add transform functions for various temporal typmod coercisions.
This enables ALTER TABLE to skip table and index rebuilds in some cases.Noah Misch, with trivial changes by me.
1 parent1a01560 commitc138979

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8 files changed

+150
-6
lines changed

8 files changed

+150
-6
lines changed

‎src/backend/utils/adt/date.c

Lines changed: 11 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1210,6 +1210,17 @@ timetypmodout(PG_FUNCTION_ARGS)
12101210
}
12111211

12121212

1213+
/* time_transform()
1214+
* Flatten calls to time_scale() and timetz_scale() that solely represent
1215+
* increases in allowed precision.
1216+
*/
1217+
Datum
1218+
time_transform(PG_FUNCTION_ARGS)
1219+
{
1220+
PG_RETURN_POINTER(TemporalTransform(MAX_TIME_PRECISION,
1221+
(Node*)PG_GETARG_POINTER(0)));
1222+
}
1223+
12131224
/* time_scale()
12141225
* Adjust time type for specified scale factor.
12151226
* Used by PostgreSQL type system to stuff columns.

‎src/backend/utils/adt/datetime.c

Lines changed: 35 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -23,6 +23,8 @@
2323
#include"catalog/pg_type.h"
2424
#include"funcapi.h"
2525
#include"miscadmin.h"
26+
#include"nodes/nodeFuncs.h"
27+
#include"parser/parse_clause.h"
2628
#include"utils/builtins.h"
2729
#include"utils/date.h"
2830
#include"utils/datetime.h"
@@ -4141,6 +4143,39 @@ CheckDateTokenTables(void)
41414143
returnok;
41424144
}
41434145

4146+
/*
4147+
* Helper for temporal protransform functions. Types time, timetz, timestamp
4148+
* and timestamptz each have a range of allowed precisions. An unspecified
4149+
* precision is rigorously equivalent to the highest specifiable precision.
4150+
*/
4151+
Node*
4152+
TemporalTransform(int32max_precis,Node*node)
4153+
{
4154+
FuncExpr*expr= (FuncExpr*)node;
4155+
Node*typmod;
4156+
Node*ret=NULL;
4157+
4158+
if (!IsA(expr,FuncExpr))
4159+
returnret;
4160+
4161+
Assert(list_length(expr->args)==2);
4162+
typmod=lsecond(expr->args);
4163+
4164+
if (IsA(typmod,Const))
4165+
{
4166+
Node*source=linitial(expr->args);
4167+
int32old_precis=exprTypmod(source);
4168+
int32new_precis=DatumGetInt32(((Const*)typmod)->constvalue);
4169+
4170+
if (new_precis==-1||
4171+
new_precis==max_precis||
4172+
(old_precis!=-1&&new_precis >=old_precis))
4173+
ret=relabel_to_typmod(source,new_precis);
4174+
}
4175+
4176+
returnret;
4177+
}
4178+
41444179
/*
41454180
* This function gets called during timezone config file load or reload
41464181
* to create the final array of timezone tokens. The argument array

‎src/backend/utils/adt/timestamp.c

Lines changed: 86 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -27,6 +27,8 @@
2727
#include"funcapi.h"
2828
#include"libpq/pqformat.h"
2929
#include"miscadmin.h"
30+
#include"nodes/nodeFuncs.h"
31+
#include"parser/parse_clause.h"
3032
#include"parser/scansup.h"
3133
#include"utils/array.h"
3234
#include"utils/builtins.h"
@@ -308,6 +310,21 @@ timestamptypmodout(PG_FUNCTION_ARGS)
308310
}
309311

310312

313+
/* timestamp_transform()
314+
* Flatten calls to timestamp_scale() and timestamptz_scale() that solely
315+
* represent increases in allowed precision.
316+
*/
317+
Datum
318+
timestamp_transform(PG_FUNCTION_ARGS)
319+
{
320+
/*
321+
* timestamp_scale throws an error when the typmod is out of range, but we
322+
* can't get there from a cast: our typmodin will have caught it already.
323+
*/
324+
PG_RETURN_POINTER(TemporalTransform(MAX_TIMESTAMP_PRECISION,
325+
(Node*)PG_GETARG_POINTER(0)));
326+
}
327+
311328
/* timestamp_scale()
312329
* Adjust time type for specified scale factor.
313330
* Used by PostgreSQL type system to stuff columns.
@@ -745,6 +762,18 @@ interval_send(PG_FUNCTION_ARGS)
745762
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
746763
}
747764

765+
/*
766+
* The interval typmod stores a "range" in its high 16 bits and a "precision"
767+
* in its low 16 bits. Both contribute to defining the resolution of the
768+
* type. Range addresses resolution granules larger than one second, and
769+
* precision specifies resolution below one second. This representation can
770+
* express all SQL standard resolutions, but we implement them all in terms of
771+
* truncating rightward from some position. Range is a bitmap of permitted
772+
* fields, but only the temporally-smallest such field is significant to our
773+
* calculations. Precision is a count of sub-second decimal places to retain.
774+
* Setting all bits (INTERVAL_FULL_PRECISION) gives the same truncation
775+
* semantics as choosing MAX_INTERVAL_PRECISION.
776+
*/
748777
Datum
749778
intervaltypmodin(PG_FUNCTION_ARGS)
750779
{
@@ -901,6 +930,63 @@ intervaltypmodout(PG_FUNCTION_ARGS)
901930
}
902931

903932

933+
/* interval_transform()
934+
* Flatten superfluous calls to interval_scale(). The interval typmod is
935+
* complex to permit accepting and regurgitating all SQL standard variations.
936+
* For truncation purposes, it boils down to a single, simple granularity.
937+
*/
938+
Datum
939+
interval_transform(PG_FUNCTION_ARGS)
940+
{
941+
FuncExpr*expr= (FuncExpr*)PG_GETARG_POINTER(0);
942+
Node*typmod;
943+
Node*ret=NULL;
944+
945+
if (!IsA(expr,FuncExpr))
946+
PG_RETURN_POINTER(ret);
947+
948+
Assert(list_length(expr->args)==2);
949+
typmod=lsecond(expr->args);
950+
951+
if (IsA(typmod,Const))
952+
{
953+
Node*source=linitial(expr->args);
954+
int32old_typmod=exprTypmod(source);
955+
int32new_typmod=DatumGetInt32(((Const*)typmod)->constvalue);
956+
intold_range;
957+
intold_precis;
958+
intnew_range=INTERVAL_RANGE(new_typmod);
959+
intnew_precis=INTERVAL_PRECISION(new_typmod);
960+
intnew_range_fls;
961+
962+
if (old_typmod==-1)
963+
{
964+
old_range=INTERVAL_FULL_RANGE;
965+
old_precis=INTERVAL_FULL_PRECISION;
966+
}
967+
else
968+
{
969+
old_range=INTERVAL_RANGE(old_typmod);
970+
old_precis=INTERVAL_PRECISION(old_typmod);
971+
}
972+
973+
/*
974+
* Temporally-smaller fields occupy higher positions in the range
975+
* bitmap. Since only the temporally-smallest bit matters for length
976+
* coercion purposes, we compare the last-set bits in the ranges.
977+
*/
978+
new_range_fls=fls(new_range);
979+
if (new_typmod==-1||
980+
((new_range_fls >=SECOND||
981+
new_range_fls >=fls(old_range))&&
982+
(new_precis >=MAX_INTERVAL_PRECISION||
983+
new_precis >=old_precis)))
984+
ret=relabel_to_typmod(source,new_typmod);
985+
}
986+
987+
PG_RETURN_POINTER(ret);
988+
}
989+
904990
/* interval_scale()
905991
* Adjust interval type for specified fields.
906992
* Used by PostgreSQL type system to stuff columns.

‎src/include/catalog/catversion.h

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -53,6 +53,6 @@
5353
*/
5454

5555
/*yyyymmddN */
56-
#defineCATALOG_VERSION_NO201202072
56+
#defineCATALOG_VERSION_NO201202081
5757

5858
#endif

‎src/include/catalog/pg_proc.h

Lines changed: 11 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -1257,7 +1257,9 @@ DESCR("date difference preserving months and years");
12571257

12581258
/* OIDS 1200 - 1299 */
12591259

1260-
DATA(insertOID=1200 (intervalPGNSPPGUID121000ffftfi201186"1186 23"_null__null__null__null_interval_scale_null__null__null_ ));
1260+
DATA(insertOID=3918 (interval_transformPGNSPPGUID121000ffftfi102281"2281"_null__null__null__null_interval_transform_null__null__null_ ));
1261+
DESCR("transform an interval length coercion");
1262+
DATA(insertOID=1200 (intervalPGNSPPGUID121003918ffftfi201186"1186 23"_null__null__null__null_interval_scale_null__null__null_ ));
12611263
DESCR("adjust interval precision");
12621264

12631265
DATA(insertOID=1215 (obj_descriptionPGNSPPGUID14100000ffftfs2025"26 19"_null__null__null__null_"select description from pg_catalog.pg_description where objoid = $1 and classoid = (select oid from pg_catalog.pg_class where relname = $2 and relnamespace = PGNSP) and objsubid = 0"_null__null__null_ ));
@@ -2732,19 +2734,23 @@ DATA(insert OID = 1953 ( byteane PGNSP PGUID 12 1 0 0 0 f f f t f i 2 0 16
27322734
DATA(insertOID=1954 (byteacmpPGNSPPGUID121000ffftfi2023"17 17"_null__null__null__null_byteacmp_null__null__null_ ));
27332735
DESCR("less-equal-greater");
27342736

2735-
DATA(insertOID=1961 (timestampPGNSPPGUID121000ffftfi201114"1114 23"_null__null__null__null_timestamp_scale_null__null__null_ ));
2737+
DATA(insertOID=3917 (timestamp_transformPGNSPPGUID121000ffftfi102281"2281"_null__null__null__null_timestamp_transform_null__null__null_ ));
2738+
DESCR("transform a timestamp length coercion");
2739+
DATA(insertOID=1961 (timestampPGNSPPGUID121003917ffftfi201114"1114 23"_null__null__null__null_timestamp_scale_null__null__null_ ));
27362740
DESCR("adjust timestamp precision");
27372741

27382742
DATA(insertOID=1965 (oidlargerPGNSPPGUID121000ffftfi2026"26 26"_null__null__null__null_oidlarger_null__null__null_ ));
27392743
DESCR("larger of two");
27402744
DATA(insertOID=1966 (oidsmallerPGNSPPGUID121000ffftfi2026"26 26"_null__null__null__null_oidsmaller_null__null__null_ ));
27412745
DESCR("smaller of two");
27422746

2743-
DATA(insertOID=1967 (timestamptzPGNSPPGUID121000ffftfi201184"1184 23"_null__null__null__null_timestamptz_scale_null__null__null_ ));
2747+
DATA(insertOID=1967 (timestamptzPGNSPPGUID121003917ffftfi201184"1184 23"_null__null__null__null_timestamptz_scale_null__null__null_ ));
27442748
DESCR("adjust timestamptz precision");
2745-
DATA(insertOID=1968 (timePGNSPPGUID121000ffftfi201083"1083 23"_null__null__null__null_time_scale_null__null__null_ ));
2749+
DATA(insertOID=3944 (time_transformPGNSPPGUID121000ffftfi102281"2281"_null__null__null__null_time_transform_null__null__null_ ));
2750+
DESCR("transform a time length coercion");
2751+
DATA(insertOID=1968 (timePGNSPPGUID121003944ffftfi201083"1083 23"_null__null__null__null_time_scale_null__null__null_ ));
27462752
DESCR("adjust time precision");
2747-
DATA(insertOID=1969 (timetzPGNSPPGUID121000ffftfi201266"1266 23"_null__null__null__null_timetz_scale_null__null__null_ ));
2753+
DATA(insertOID=1969 (timetzPGNSPPGUID121003944ffftfi201266"1266 23"_null__null__null__null_timetz_scale_null__null__null_ ));
27482754
DESCR("adjust time with time zone precision");
27492755

27502756
DATA(insertOID=2003 (textanycatPGNSPPGUID141000ffftfv2025"25 2776"_null__null__null__null_"select $1 || $2::pg_catalog.text"_null__null__null_ ));

‎src/include/utils/date.h

Lines changed: 1 addition & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -154,6 +154,7 @@ extern Datum time_recv(PG_FUNCTION_ARGS);
154154
externDatumtime_send(PG_FUNCTION_ARGS);
155155
externDatumtimetypmodin(PG_FUNCTION_ARGS);
156156
externDatumtimetypmodout(PG_FUNCTION_ARGS);
157+
externDatumtime_transform(PG_FUNCTION_ARGS);
157158
externDatumtime_scale(PG_FUNCTION_ARGS);
158159
externDatumtime_eq(PG_FUNCTION_ARGS);
159160
externDatumtime_ne(PG_FUNCTION_ARGS);

‎src/include/utils/datetime.h

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -16,6 +16,7 @@
1616
#ifndefDATETIME_H
1717
#defineDATETIME_H
1818

19+
#include"nodes/nodes.h"
1920
#include"utils/timestamp.h"
2021

2122
/* this struct is declared in utils/tzparser.h: */
@@ -298,6 +299,8 @@ extern intDecodeUnits(int field, char *lowtoken, int *val);
298299

299300
externintj2day(intjd);
300301

302+
externNode*TemporalTransform(int32max_precis,Node*node);
303+
301304
externboolCheckDateTokenTables(void);
302305

303306
externvoidConvertTimeZoneAbbrevs(TimeZoneAbbrevTable*tbl,

‎src/include/utils/timestamp.h

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -100,6 +100,7 @@ extern Datum timestamp_recv(PG_FUNCTION_ARGS);
100100
externDatumtimestamp_send(PG_FUNCTION_ARGS);
101101
externDatumtimestamptypmodin(PG_FUNCTION_ARGS);
102102
externDatumtimestamptypmodout(PG_FUNCTION_ARGS);
103+
externDatumtimestamp_transform(PG_FUNCTION_ARGS);
103104
externDatumtimestamp_scale(PG_FUNCTION_ARGS);
104105
externDatumtimestamp_eq(PG_FUNCTION_ARGS);
105106
externDatumtimestamp_ne(PG_FUNCTION_ARGS);
@@ -136,6 +137,7 @@ extern Datum interval_recv(PG_FUNCTION_ARGS);
136137
externDatuminterval_send(PG_FUNCTION_ARGS);
137138
externDatumintervaltypmodin(PG_FUNCTION_ARGS);
138139
externDatumintervaltypmodout(PG_FUNCTION_ARGS);
140+
externDatuminterval_transform(PG_FUNCTION_ARGS);
139141
externDatuminterval_scale(PG_FUNCTION_ARGS);
140142
externDatuminterval_eq(PG_FUNCTION_ARGS);
141143
externDatuminterval_ne(PG_FUNCTION_ARGS);

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