Preliminary datetime infrastructure

Author: Nikita Glukhov

doc/src/sgml/func.sgml

@@ -5989,6 +5989,30 @@ SELECT regexp_match('abc01234xyz', '(?:(.*?)(\d+)(.*)){1,1}');
         <entry><literal>US</literal></entry>
         <entry>microsecond (000000-999999)</entry>
        </row>
+       <row>
+        <entry><literal>FF1</literal></entry>
+        <entry>decisecond (0-9)</entry>
+       </row>
+       <row>
+        <entry><literal>FF2</literal></entry>
+        <entry>centisecond (00-99)</entry>
+       </row>
+       <row>
+        <entry><literal>FF3</literal></entry>
+        <entry>millisecond (000-999)</entry>
+       </row>
+       <row>
+        <entry><literal>FF4</literal></entry>
+        <entry>tenth of a millisecond (0000-9999)</entry>
+       </row>
+       <row>
+        <entry><literal>FF5</literal></entry>
+        <entry>hundredth of a millisecond (00000-99999)</entry>
+       </row>
+       <row>
+        <entry><literal>FF6</literal></entry>
+        <entry>microsecond (000000-999999)</entry>
+       </row>
        <row>
         <entry><literal>SSSS</literal></entry>
         <entry>seconds past midnight (0-86399)</entry>

src/backend/utils/adt/date.c

@@ -40,11 +40,6 @@
 #endif
 
 
-static int	tm2time(struct pg_tm *tm, fsec_t fsec, TimeADT *result);
-static int	tm2timetz(struct pg_tm *tm, fsec_t fsec, int tz, TimeTzADT *result);
-static void AdjustTimeForTypmod(TimeADT *time, int32 typmod);
-
-
 /* common code for timetypmodin and timetztypmodin */
 static int32
 anytime_typmodin(bool istz, ArrayType *ta)
@@ -1210,7 +1205,7 @@ time_in(PG_FUNCTION_ARGS)
 /* tm2time()
  * Convert a tm structure to a time data type.
  */
-static int
+int
 tm2time(struct pg_tm *tm, fsec_t fsec, TimeADT *result)
 {
 	*result = ((((tm->tm_hour * MINS_PER_HOUR + tm->tm_min) * SECS_PER_MINUTE) + tm->tm_sec)
@@ -1376,7 +1371,7 @@ time_scale(PG_FUNCTION_ARGS)
  * have a fundamental tie together but rather a coincidence of
  * implementation. - thomas
  */
-static void
+void
 AdjustTimeForTypmod(TimeADT *time, int32 typmod)
 {
 	static const int64 TimeScales[MAX_TIME_PRECISION + 1] = {
@@ -1954,7 +1949,7 @@ time_part(PG_FUNCTION_ARGS)
 /* tm2timetz()
  * Convert a tm structure to a time data type.
  */
-static int
+int
 tm2timetz(struct pg_tm *tm, fsec_t fsec, int tz, TimeTzADT *result)
 {
 	result->time = ((((tm->tm_hour * MINS_PER_HOUR + tm->tm_min) * SECS_PER_MINUTE) + tm->tm_sec) *