[yugabyte#5408] [YSQL] Error suppression support for upcoming jsonpath .datetime() method

Summary:
Original Postgres commit was 5bc450629b31a0b6986e668056d5bd36792412d2

Commit message was:

    Add support of error suppression in some date and time manipulation functions
    as it's required for jsonpath .datetime() method support.  This commit doesn't
    use PG_TRY()/PG_CATCH() in order to implement that.  Instead, it provides
    internal versions of date and time functions used, which support error
    suppression.

    Discussion: https://postgr.es/m/CAPpHfdsZgYEra_PeCLGNoXOWYx6iU-S3wF8aX0ObQUcZU%2B4XTw%40mail.gmail.com
    Author: Alexander Korotkov, Nikita Glukhov
    Reviewed-by: Anastasia Lubennikova, Peter Eisentraut

Test Plan: Build yugabyte db and run tests via Jenkins

Reviewers: mihnea, jason

Reviewed By: jason

Subscribers: yql

Differential Revision: https://phabricator.dev.yugabyte.com/D9545

Author: tedyu

src/postgres/src/backend/utils/adt/date.c

@@ -558,13 +558,15 @@ date_mii(PG_FUNCTION_ARGS)
 	PG_RETURN_DATEADT(result);
 }
 
+
 /*
- * Internal routines for promoting date to timestamp and timestamp with
- * time zone
+ * Promote date to timestamp.
+ *
+ * If 'have_error' is NULL, then errors are thrown, else '*have_error' is set
+ * and zero is returned.
  */
-
-static Timestamp
-date2timestamp(DateADT dateVal)
+Timestamp
+date2timestamp_opt_error(DateADT dateVal, bool *have_error)
 {
 	Timestamp	result;
 
@@ -580,9 +582,19 @@ date2timestamp(DateADT dateVal)
 		 * boundary need be checked for overflow.
 		 */
 		if (dateVal >= (TIMESTAMP_END_JULIAN - POSTGRES_EPOCH_JDATE))
-			ereport(ERROR,
-					(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
-					 errmsg("date out of range for timestamp")));
+		{
+			if (have_error)
+			{
+				*have_error = true;
+				return (Timestamp) 0;
+			}
+			else
+			{
+				ereport(ERROR,
+						(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
+						 errmsg("date out of range for timestamp")));
+			}
+		}
 
 		/* date is days since 2000, timestamp is microseconds since same... */
 		result = dateVal * USECS_PER_DAY;
@@ -591,8 +603,23 @@ date2timestamp(DateADT dateVal)
 	return result;
 }
 
+/*
+ * Single-argument version of date2timestamp_opt_error().
+ */
 static TimestampTz
-date2timestamptz(DateADT dateVal)
+date2timestamp(DateADT dateVal)
+{
+	return date2timestamp_opt_error(dateVal, NULL);
+}
+
+/*
+ * Promote date to timestamp with time zone.
+ *
+ * If 'have_error' is NULL, then errors are thrown, else '*have_error' is set
+ * and zero is returned.
+ */
+TimestampTz
+date2timestamptz_opt_error(DateADT dateVal, bool *have_error)
 {
 	TimestampTz result;
 	struct pg_tm tt,
@@ -611,9 +638,19 @@ date2timestamptz(DateADT dateVal)
 		 * boundary need be checked for overflow.
 		 */
 		if (dateVal >= (TIMESTAMP_END_JULIAN - POSTGRES_EPOCH_JDATE))
-			ereport(ERROR,
-					(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
-					 errmsg("date out of range for timestamp")));
+		{
+			if (have_error)
+			{
+				*have_error = true;
+				return (TimestampTz) 0;
+			}
+			else
+			{
+				ereport(ERROR,
+						(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
+						 errmsg("date out of range for timestamp")));
+			}
+		}
 
 		j2date(dateVal + POSTGRES_EPOCH_JDATE,
 			   &(tm->tm_year), &(tm->tm_mon), &(tm->tm_mday));
@@ -629,14 +666,33 @@ date2timestamptz(DateADT dateVal)
 		 * of time zone, check for allowed timestamp range after adding tz.
 		 */
 		if (!IS_VALID_TIMESTAMP(result))
-			ereport(ERROR,
-					(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
-					 errmsg("date out of range for timestamp")));
+		{
+			if (have_error)
+			{
+				*have_error = true;
+				return (TimestampTz) 0;
+			}
+			else
+			{
+				ereport(ERROR,
+						(errcode(ERRCODE_DATETIME_VALUE_OUT_OF_RANGE),
+						 errmsg("date out of range for timestamp")));
+			}
+		}
 	}
 
 	return result;
 }
 
+/*
+ * Single-argument version of date2timestamptz_opt_error().
+ */
+static TimestampTz
+date2timestamptz(DateADT dateVal)
+{
+	return date2timestamptz_opt_error(dateVal, NULL);
+}
+
 /*
  * date2timestamp_no_overflow
  *