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Change AdjustIntervalForTypmod to not discard higher-order field values on the
grounds that they don't fit into the specified interval qualifier (typmod). This behavior, while of long standing, is clearly wrong per spec --- for example the value INTERVAL '999' SECOND means 999 seconds and should not be reduced to less than 60 seconds. In some cases there could be grounds to raise an error if higher-order field values are not given as zero; for example '1 year 1 month'::INTERVAL MONTH should arguably be taken as an error rather than equivalent to 13 months. However our internal representation doesn't allow us to do that in a fashion that would consistently reject all and only the cases that a strict reading of the spec would suggest. Also, seeing that for example INTERVAL '13' MONTH will print out as '1 year 1 mon', we have to be careful not to create a situation where valid data will fail to dump and reload. The present patch therefore takes the attitude of not throwing an error in any such case. We might want to revisit that in future but it would take more redesign than seems prudent in late beta. Per a complaint from Sebastien Flaesch and subsequent discussion. While at other times we might have just postponed such an issue to the next development cycle, 8.4 already has changed the parsing of interval literals quite a bit in an effort to accept all spec-compliant cases correctly. This seems like a change that should be part of that rather than coming along later.
This commit is contained in:
Tom Lane
@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.199 2009/05/26 02:17:50 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/utils/adt/timestamp.c,v 1.200 2009/06/01 23:55:15 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -955,13 +955,32 @@ AdjustIntervalForTypmod(Interval *interval, int32 typmod)
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/*
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* Unspecified range and precision? Then not necessary to adjust. Setting
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* typmod to -1 is the convention for all types.
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* typmod to -1 is the convention for all data types.
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*/
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if (typmod >= 0)
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{
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int range = INTERVAL_RANGE(typmod);
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int precision = INTERVAL_PRECISION(typmod);
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/*
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* Our interpretation of intervals with a limited set of fields
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* is that fields to the right of the last one specified are zeroed
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* out, but those to the left of it remain valid. Thus for example
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* there is no operational difference between INTERVAL YEAR TO MONTH
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* and INTERVAL MONTH. In some cases we could meaningfully enforce
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* that higher-order fields are zero; for example INTERVAL DAY could
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* reject nonzero "month" field. However that seems a bit pointless
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* when we can't do it consistently. (We cannot enforce a range limit
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* on the highest expected field, since we do not have any equivalent
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* of SQL's <interval leading field precision>.)
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*
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* Note: before PG 8.4 we interpreted a limited set of fields as
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* actually causing a "modulo" operation on a given value, potentially
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* losing high-order as well as low-order information. But there is
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* no support for such behavior in the standard, and it seems fairly
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* undesirable on data consistency grounds anyway. Now we only
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* perform truncation or rounding of low-order fields.
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*/
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if (range == INTERVAL_FULL_RANGE)
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{
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/* Do nothing... */
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@ -974,27 +993,21 @@ AdjustIntervalForTypmod(Interval *interval, int32 typmod)
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}
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else if (range == INTERVAL_MASK(MONTH))
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{
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interval->month %= MONTHS_PER_YEAR;
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interval->day = 0;
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interval->time = 0;
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}
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/* YEAR TO MONTH */
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else if (range == (INTERVAL_MASK(YEAR) | INTERVAL_MASK(MONTH)))
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{
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/* month is already year to month */
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interval->day = 0;
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interval->time = 0;
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}
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else if (range == INTERVAL_MASK(DAY))
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{
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interval->month = 0;
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interval->time = 0;
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}
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else if (range == INTERVAL_MASK(HOUR))
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{
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interval->month = 0;
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interval->day = 0;
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#ifdef HAVE_INT64_TIMESTAMP
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interval->time = (interval->time / USECS_PER_HOUR) *
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USECS_PER_HOUR;
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@ -1004,42 +1017,21 @@ AdjustIntervalForTypmod(Interval *interval, int32 typmod)
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}
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else if (range == INTERVAL_MASK(MINUTE))
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{
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TimeOffset hour;
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interval->month = 0;
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interval->day = 0;
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#ifdef HAVE_INT64_TIMESTAMP
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hour = interval->time / USECS_PER_HOUR;
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interval->time -= hour * USECS_PER_HOUR;
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interval->time = (interval->time / USECS_PER_MINUTE) *
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USECS_PER_MINUTE;
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#else
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TMODULO(interval->time, hour, (double) SECS_PER_HOUR);
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interval->time = ((int) (interval->time / SECS_PER_MINUTE)) * (double) SECS_PER_MINUTE;
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#endif
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}
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else if (range == INTERVAL_MASK(SECOND))
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{
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TimeOffset minute;
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interval->month = 0;
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interval->day = 0;
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#ifdef HAVE_INT64_TIMESTAMP
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minute = interval->time / USECS_PER_MINUTE;
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interval->time -= minute * USECS_PER_MINUTE;
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#else
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TMODULO(interval->time, minute, (double) SECS_PER_MINUTE);
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/* return subseconds too */
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#endif
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/* fractional-second rounding will be dealt with below */
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}
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/* DAY TO HOUR */
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else if (range == (INTERVAL_MASK(DAY) |
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INTERVAL_MASK(HOUR)))
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{
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interval->month = 0;
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#ifdef HAVE_INT64_TIMESTAMP
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interval->time = (interval->time / USECS_PER_HOUR) *
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USECS_PER_HOUR;
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@ -1052,8 +1044,6 @@ AdjustIntervalForTypmod(Interval *interval, int32 typmod)
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INTERVAL_MASK(HOUR) |
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INTERVAL_MASK(MINUTE)))
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{
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interval->month = 0;
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#ifdef HAVE_INT64_TIMESTAMP
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interval->time = (interval->time / USECS_PER_MINUTE) *
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USECS_PER_MINUTE;
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@ -1066,15 +1056,13 @@ AdjustIntervalForTypmod(Interval *interval, int32 typmod)
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INTERVAL_MASK(HOUR) |
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INTERVAL_MASK(MINUTE) |
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INTERVAL_MASK(SECOND)))
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interval->month = 0;
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{
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/* fractional-second rounding will be dealt with below */
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}
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/* HOUR TO MINUTE */
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else if (range == (INTERVAL_MASK(HOUR) |
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INTERVAL_MASK(MINUTE)))
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{
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interval->month = 0;
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interval->day = 0;
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#ifdef HAVE_INT64_TIMESTAMP
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interval->time = (interval->time / USECS_PER_MINUTE) *
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USECS_PER_MINUTE;
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@ -1087,25 +1075,13 @@ AdjustIntervalForTypmod(Interval *interval, int32 typmod)
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INTERVAL_MASK(MINUTE) |
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INTERVAL_MASK(SECOND)))
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{
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interval->month = 0;
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interval->day = 0;
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/* return subseconds too */
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/* fractional-second rounding will be dealt with below */
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}
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/* MINUTE TO SECOND */
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else if (range == (INTERVAL_MASK(MINUTE) |
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INTERVAL_MASK(SECOND)))
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{
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TimeOffset hour;
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interval->month = 0;
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interval->day = 0;
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#ifdef HAVE_INT64_TIMESTAMP
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hour = interval->time / USECS_PER_HOUR;
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interval->time -= hour * USECS_PER_HOUR;
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#else
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TMODULO(interval->time, hour, (double) SECS_PER_HOUR);
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#endif
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/* fractional-second rounding will be dealt with below */
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}
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else
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elog(ERROR, "unrecognized interval typmod: %d", typmod);
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@ -1148,8 +1124,6 @@ AdjustIntervalForTypmod(Interval *interval, int32 typmod)
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#endif
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}
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}
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return;
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}
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