Fix is_digit labeling of to_timestamp's FFn format codes.

These format codes produce or consume strings of digits, so they
should be labeled with is_digit = true, but they were not.
This has effect in only one place, where is_next_separator()
is checked to see if the preceding format code should slurp up
all the available digits.  Thus, with a format such as '...SSFF3'
with remaining input '12345', the 'SS' code would consume all
five digits (and then complain about seconds being out of range)
when it should eat only two digits.

Per report from Nick Davies.  This bug goes back to d589f9446
where the FFn codes were introduced, so back-patch to v13.

Discussion: https://postgr.es/m/AM8PR08MB6356AC979252CFEA78B56678B6312@AM8PR08MB6356.eurprd08.prod.outlook.com

3 files changed, 25 insertions, 13 deletions

diff --git a/src/backend/utils/adt/formatting.c b/src/backend/utils/adt/formatting.c
index 5bd4d1967b9..9169539b76d 100644
--- a/src/backend/utils/adt/formatting.c
+++ b/src/backend/utils/adt/formatting.c
@@ -624,7 +624,7 @@ typedef enum
 	DCH_Day,
 	DCH_Dy,
 	DCH_D,
-	DCH_FF1,
+	DCH_FF1,					/* FFn codes must be consecutive */
 	DCH_FF2,
 	DCH_FF3,
 	DCH_FF4,
@@ -787,12 +787,12 @@ static const KeyWord DCH_keywords[] = {
 	{"Day", 3, DCH_Day, false, FROM_CHAR_DATE_NONE},
 	{"Dy", 2, DCH_Dy, false, FROM_CHAR_DATE_NONE},
 	{"D", 1, DCH_D, true, FROM_CHAR_DATE_GREGORIAN},
-	{"FF1", 3, DCH_FF1, false, FROM_CHAR_DATE_NONE},	/* F */
-	{"FF2", 3, DCH_FF2, false, FROM_CHAR_DATE_NONE},
-	{"FF3", 3, DCH_FF3, false, FROM_CHAR_DATE_NONE},
-	{"FF4", 3, DCH_FF4, false, FROM_CHAR_DATE_NONE},
-	{"FF5", 3, DCH_FF5, false, FROM_CHAR_DATE_NONE},
-	{"FF6", 3, DCH_FF6, false, FROM_CHAR_DATE_NONE},
+	{"FF1", 3, DCH_FF1, true, FROM_CHAR_DATE_NONE}, /* F */
+	{"FF2", 3, DCH_FF2, true, FROM_CHAR_DATE_NONE},
+	{"FF3", 3, DCH_FF3, true, FROM_CHAR_DATE_NONE},
+	{"FF4", 3, DCH_FF4, true, FROM_CHAR_DATE_NONE},
+	{"FF5", 3, DCH_FF5, true, FROM_CHAR_DATE_NONE},
+	{"FF6", 3, DCH_FF6, true, FROM_CHAR_DATE_NONE},
 	{"FX", 2, DCH_FX, false, FROM_CHAR_DATE_NONE},
 	{"HH24", 4, DCH_HH24, true, FROM_CHAR_DATE_NONE},	/* H */
 	{"HH12", 4, DCH_HH12, true, FROM_CHAR_DATE_NONE},
@@ -843,12 +843,12 @@ static const KeyWord DCH_keywords[] = {
 	{"dd", 2, DCH_DD, true, FROM_CHAR_DATE_GREGORIAN},
 	{"dy", 2, DCH_dy, false, FROM_CHAR_DATE_NONE},
 	{"d", 1, DCH_D, true, FROM_CHAR_DATE_GREGORIAN},
-	{"ff1", 3, DCH_FF1, false, FROM_CHAR_DATE_NONE},	/* f */
-	{"ff2", 3, DCH_FF2, false, FROM_CHAR_DATE_NONE},
-	{"ff3", 3, DCH_FF3, false, FROM_CHAR_DATE_NONE},
-	{"ff4", 3, DCH_FF4, false, FROM_CHAR_DATE_NONE},
-	{"ff5", 3, DCH_FF5, false, FROM_CHAR_DATE_NONE},
-	{"ff6", 3, DCH_FF6, false, FROM_CHAR_DATE_NONE},
+	{"ff1", 3, DCH_FF1, true, FROM_CHAR_DATE_NONE}, /* f */
+	{"ff2", 3, DCH_FF2, true, FROM_CHAR_DATE_NONE},
+	{"ff3", 3, DCH_FF3, true, FROM_CHAR_DATE_NONE},
+	{"ff4", 3, DCH_FF4, true, FROM_CHAR_DATE_NONE},
+	{"ff5", 3, DCH_FF5, true, FROM_CHAR_DATE_NONE},
+	{"ff6", 3, DCH_FF6, true, FROM_CHAR_DATE_NONE},
 	{"fx", 2, DCH_FX, false, FROM_CHAR_DATE_NONE},
 	{"hh24", 4, DCH_HH24, true, FROM_CHAR_DATE_NONE},	/* h */
 	{"hh12", 4, DCH_HH12, true, FROM_CHAR_DATE_NONE},
diff --git a/src/test/regress/expected/horology.out b/src/test/regress/expected/horology.out
index e4b57f62159..bbd7e282343 100644
--- a/src/test/regress/expected/horology.out
+++ b/src/test/regress/expected/horology.out
@@ -2979,6 +2979,17 @@ SELECT i, to_timestamp('2018-11-02 12:34:56.123456', 'YYYY-MM-DD HH24:MI:SS.FF'
 
 SELECT i, to_timestamp('2018-11-02 12:34:56.123456789', 'YYYY-MM-DD HH24:MI:SS.FF' || i) FROM generate_series(1, 6) i;
 ERROR:  date/time field value out of range: "2018-11-02 12:34:56.123456789"
+SELECT i, to_timestamp('20181102123456123456', 'YYYYMMDDHH24MISSFF' || i) FROM generate_series(1, 6) i;
+ i |            to_timestamp             
+---+-------------------------------------
+ 1 | Fri Nov 02 12:34:56.1 2018 PDT
+ 2 | Fri Nov 02 12:34:56.12 2018 PDT
+ 3 | Fri Nov 02 12:34:56.123 2018 PDT
+ 4 | Fri Nov 02 12:34:56.1235 2018 PDT
+ 5 | Fri Nov 02 12:34:56.12346 2018 PDT
+ 6 | Fri Nov 02 12:34:56.123456 2018 PDT
+(6 rows)
+
 SELECT to_date('1 4 1902', 'Q MM YYYY');  -- Q is ignored
   to_date   
 ------------
diff --git a/src/test/regress/sql/horology.sql b/src/test/regress/sql/horology.sql
index 13f86ce8fc0..d3b9f1628a4 100644
--- a/src/test/regress/sql/horology.sql
+++ b/src/test/regress/sql/horology.sql
@@ -450,6 +450,7 @@ SELECT i, to_timestamp('2018-11-02 12:34:56.1234', 'YYYY-MM-DD HH24:MI:SS.FF' ||
 SELECT i, to_timestamp('2018-11-02 12:34:56.12345', 'YYYY-MM-DD HH24:MI:SS.FF' || i) FROM generate_series(1, 6) i;
 SELECT i, to_timestamp('2018-11-02 12:34:56.123456', 'YYYY-MM-DD HH24:MI:SS.FF' || i) FROM generate_series(1, 6) i;
 SELECT i, to_timestamp('2018-11-02 12:34:56.123456789', 'YYYY-MM-DD HH24:MI:SS.FF' || i) FROM generate_series(1, 6) i;
+SELECT i, to_timestamp('20181102123456123456', 'YYYYMMDDHH24MISSFF' || i) FROM generate_series(1, 6) i;
 
 SELECT to_date('1 4 1902', 'Q MM YYYY');  -- Q is ignored
 SELECT to_date('3 4 21 01', 'W MM CC YY');