Add hint for to_char(interval) invalid format specifications.

diff --git a/src/backend/utils/adt/formatting.c b/src/backend/utils/adt/formatting.c
index 8e329d89d9016aa54f5b56e2c53360e9b6211e57..84b6a65f6281a779fa8dd31ef2fde5d048cdf3d1 100644 (file)
--- a/src/backend/utils/adt/formatting.c
+++ b/src/backend/utils/adt/formatting.c
@@ -421,26 +421,27 @@ typedef struct TmToChar
 #define tmtcFsec(_X)   ((_X)->fsec)
 
 #define ZERO_tm(_X) \
-       do {    \
-               (_X)->tm_sec  = (_X)->tm_year = (_X)->tm_min = (_X)->tm_wday = \
-               (_X)->tm_hour = (_X)->tm_yday = (_X)->tm_isdst = 0; \
-               (_X)->tm_mday = (_X)->tm_mon  = 1; \
-       } while(0)
+do {   \
+       (_X)->tm_sec  = (_X)->tm_year = (_X)->tm_min = (_X)->tm_wday = \
+       (_X)->tm_hour = (_X)->tm_yday = (_X)->tm_isdst = 0; \
+       (_X)->tm_mday = (_X)->tm_mon  = 1; \
+} while(0)
 
 #define ZERO_tmtc(_X) \
-       do { \
-               ZERO_tm( tmtcTm(_X) ); \
-               tmtcFsec(_X) = 0; \
-               tmtcTzn(_X) = NULL; \
-       } while(0)
+do { \
+       ZERO_tm( tmtcTm(_X) ); \
+       tmtcFsec(_X) = 0; \
+       tmtcTzn(_X) = NULL; \
+} while(0)
 
 #define INVALID_FOR_INTERVAL  \
-       do { \
-               if (is_interval) \
-                       ereport(ERROR, \
-                                       (errcode(ERRCODE_INVALID_DATETIME_FORMAT), \
-                                        errmsg("invalid format specification for an interval value"))); \
-       } while(0)
+do { \
+       if (is_interval) \
+               ereport(ERROR, \
+                               (errcode(ERRCODE_INVALID_DATETIME_FORMAT), \
+                                errmsg("invalid format specification for an interval value"), \
+                                errhint("Intervals are not tied to specific calendar dates."))); \
+} while(0)
        
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