MDEV-8473: mysqlbinlog -v does not properly decode DECIMAL values in an RBR log

Backport of upstream patch. revno: 5696

1 files changed, 4 insertions, 9 deletions

diff --git a/sql/log_event.cc b/sql/log_event.cc
index 2d5c3f232a4..c962f19f703 100644
--- a/sql/log_event.cc
+++ b/sql/log_event.cc
@@ -2012,15 +2012,10 @@ log_event_print_value(IO_CACHE *file, const uchar *ptr,
       my_decimal dec;
       binary2my_decimal(E_DEC_FATAL_ERROR, (uchar*) ptr, &dec,
                         precision, decimals);
-      int i, end;
-      char buff[512], *pos;
-      pos= buff;
-      pos+= sprintf(buff, "%s", dec.sign() ? "-" : "");
-      end= ROUND_UP(dec.frac) + ROUND_UP(dec.intg)-1;
-      for (i=0; i < end; i++)
-        pos+= sprintf(pos, "%09d.", dec.buf[i]);
-      pos+= sprintf(pos, "%09d", dec.buf[i]);
-      my_b_printf(file, "%s", buff);
+      int length= DECIMAL_MAX_STR_LENGTH;
+      char buff[DECIMAL_MAX_STR_LENGTH + 1];
+      decimal2string(&dec, buff, &length, 0, 0, 0);
+      my_b_write(file, (uchar*)buff, length);
       my_snprintf(typestr, typestr_length, "DECIMAL(%d,%d)",
                   precision, decimals);
       return bin_size;