Fix (well, add) support for ISO "week" in date_part(). Needed for ODBC.

Fix spelling of "millennium".
 Thanks to Mika Nystrom <mika@camembert.cs.caltech.edu> for spotting this.

diff --git a/src/backend/utils/adt/datetime.c b/src/backend/utils/adt/datetime.c
index 2f899d21e931e3388b80c6c0423006979dad3cf2..f252a42ddc5184ab766fcb01f87b9b164f5e6226 100644 (file)
--- a/src/backend/utils/adt/datetime.c
+++ b/src/backend/utils/adt/datetime.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *       $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.46 2000/04/12 17:15:49 momjian Exp $
+ *       $Header: /cvsroot/pgsql/src/backend/utils/adt/datetime.c,v 1.47 2000/04/14 15:22:10 thomas Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -260,15 +260,14 @@ static datetkn deltatktbl[] = {
        {"hours", UNITS, DTK_HOUR}, /* "hours" relative time units */
        {"hr", UNITS, DTK_HOUR},        /* "hour" relative time units */
        {"hrs", UNITS, DTK_HOUR},       /* "hours" relative time units */
-       {INVALID, RESERV, DTK_INVALID},         /* "invalid" reserved for invalid
-                                                                                * time */
+       {INVALID, RESERV, DTK_INVALID},         /* reserved for invalid time */
        {"m", UNITS, DTK_MINUTE},       /* "minute" relative time units */
        {"microsecon", UNITS, DTK_MICROSEC},            /* "microsecond" relative
                                                                                                 * time units */
-       {"mil", UNITS, DTK_MILLENIUM},          /* "millenium" relative time units */
-       {"mils", UNITS, DTK_MILLENIUM},         /* "millenia" relative time units */
-       {"millenia", UNITS, DTK_MILLENIUM}, /* "millenia" relative time units */
-       {DMILLENIUM, UNITS, DTK_MILLENIUM}, /* "millenium" relative time units */
+       {"mil", UNITS, DTK_MILLENNIUM},         /* "millennium" relative time units */
+       {"mils", UNITS, DTK_MILLENNIUM},          /* "millennia" relative time units */
+       {"millennia", UNITS, DTK_MILLENNIUM}, /* "millennia" relative time units */
+       {DMILLENNIUM, UNITS, DTK_MILLENNIUM}, /* "millennium" relative time units */
        {"millisecon", UNITS, DTK_MILLISEC},            /* relative time units */
        {"min", UNITS, DTK_MINUTE}, /* "minute" relative time units */
        {"mins", UNITS, DTK_MINUTE},/* "minutes" relative time units */
@@ -1794,7 +1793,7 @@ DecodeDateDelta(char **field, int *ftype, int nf, int *dtype, struct tm * tm, do
                                                tmask = ((fmask & DTK_M(YEAR)) ? 0 : DTK_M(YEAR));
                                                break;
 
-                                       case DTK_MILLENIUM:
+                                       case DTK_MILLENNIUM:
                                                tm->tm_year += val * 1000;
                                                if (fval != 0)
                                                        tm->tm_mon += (fval * 12000);

diff --git a/src/backend/utils/adt/timestamp.c b/src/backend/utils/adt/timestamp.c
index a731ce3cef55c1393ff4eb2e6ca128ffd02ccb1d..56ab2f10bb678f68424f1b7e45535d298d9705c0 100644 (file)
--- a/src/backend/utils/adt/timestamp.c
+++ b/src/backend/utils/adt/timestamp.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *       $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.25 2000/04/12 17:15:51 momjian Exp $
+ *       $Header: /cvsroot/pgsql/src/backend/utils/adt/timestamp.c,v 1.26 2000/04/14 15:22:10 thomas Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -1621,7 +1621,7 @@ timestamp_trunc(text *units, Timestamp *timestamp)
                {
                        switch (val)
                        {
-                               case DTK_MILLENIUM:
+                               case DTK_MILLENNIUM:
                                        tm->tm_year = (tm->tm_year / 1000) * 1000;
                                case DTK_CENTURY:
                                        tm->tm_year = (tm->tm_year / 100) * 100;
@@ -1759,7 +1759,7 @@ interval_trunc(text *units, Interval *interval)
                {
                        switch (val)
                        {
-                               case DTK_MILLENIUM:
+                               case DTK_MILLENNIUM:
                                        tm->tm_year = (tm->tm_year / 1000) * 1000;
                                case DTK_CENTURY:
                                        tm->tm_year = (tm->tm_year / 100) * 100;
@@ -1927,6 +1927,38 @@ timestamp_part(text *units, Timestamp *timestamp)
                                        *result = (tm->tm_mon / 4) + 1;
                                        break;
 
+                               case DTK_WEEK:
+                                       {
+                                               int day0, day4, dayn;
+                                               dayn = date2j(tm->tm_year, tm->tm_mon, tm->tm_mday);
+                                               day4 = date2j(tm->tm_year, 1, 4);
+                                               /* day0 == offset to first day of week (Monday) */
+                                               day0 = (j2day(day4 - 1) % 7);
+                                               /* We need the first week containing a Thursday,
+                                                * otherwise this day falls into the previous year
+                                                * for purposes of counting weeks
+                                                */
+                                               if (dayn < (day4 - day0))
+                                               {
+                                                       day4 = date2j((tm->tm_year - 1), 1, 4);
+                                                       /* day0 == offset to first day of week (Monday) */
+                                                       day0 = (j2day(day4 - 1) % 7);
+                                               }
+                                               *result = (((dayn - (day4 - day0)) / 7) + 1);
+                                               /* Sometimes the last few days in a year will fall into
+                                                * the first week of the next year, so check for this.
+                                                */
+                                               if (*result >= 53)
+                                               {
+                                                       day4 = date2j((tm->tm_year + 1), 1, 4);
+                                                       /* day0 == offset to first day of week (Monday) */
+                                                       day0 = (j2day(day4 - 1) % 7);
+                                                       if (dayn >= (day4 - day0))
+                                                               *result = (((dayn - (day4 - day0)) / 7) + 1);
+                                               }
+                                       }
+                                       break;
+
                                case DTK_YEAR:
                                        *result = tm->tm_year;
                                        break;
@@ -1939,7 +1971,7 @@ timestamp_part(text *units, Timestamp *timestamp)
                                        *result = (tm->tm_year / 100);
                                        break;
 
-                               case DTK_MILLENIUM:
+                               case DTK_MILLENNIUM:
                                        *result = (tm->tm_year / 1000);
                                        break;
 
@@ -2082,7 +2114,7 @@ interval_part(text *units, Interval *interval)
                                        *result = (tm->tm_year / 100);
                                        break;
 
-                               case DTK_MILLENIUM:
+                               case DTK_MILLENNIUM:
                                        *result = (tm->tm_year / 1000);
                                        break;